)]}' { "log": [ { "commit": "ad8c2ee801ad7a52d919b478d9b2c7b39a72d295", "tree": "bc56cc023da3467447b0aecd30c0516881d53992", "parents": [ "51b1bd2ace1595b72956224deda349efa880b693" ], "author": { "name": "Rik van Riel", "email": "riel@redhat.com", "time": "Mon Aug 09 17:19:48 2010 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Aug 09 20:45:02 2010 -0700" }, "message": "rmap: add exclusive page to private anon_vma on swapin\n\nOn swapin it is fairly common for a page to be owned exclusively by one\nprocess. In that case we want to add the page to the anon_vma of that\nprocess\u0027s VMA, instead of to the root anon_vma.\n\nThis will reduce the amount of rmap searching that the swapout code needs\nto do.\n\nSigned-off-by: Rik van Riel \u003criel@redhat.com\u003e\nCc: Andrea Arcangeli \u003caarcange@redhat.com\u003e\nCc: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "44ab57a06ded284db6ccdefc6b76eddb1c34d7ed", "tree": "e757c1af6be102b90d8a989d6fcfacad93ff6b69", "parents": [ "21d0d443cdc1658a8c1484fdcece4803f0f96d0e" ], "author": { "name": "Andrea Arcangeli", "email": "aarcange@redhat.com", "time": "Mon Aug 09 17:19:10 2010 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Aug 09 20:44:59 2010 -0700" }, "message": "rmap: add anon_vma bug checks\n\nVerify the refcounting doesn\u0027t go wrong, and resurrect the check in\n__page_check_anon_rmap as in old anon-vma code.\n\nSigned-off-by: Andrea Arcangeli \u003caarcange@redhat.com\u003e\nSigned-off-by: Rik van Riel \u003criel@redhat.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "21d0d443cdc1658a8c1484fdcece4803f0f96d0e", "tree": "1ee41c66f24972ed427ce43780cb53efca82dcaf", "parents": [ "288468c334e98aacbb7e2fb8bde6bc1adcd55e05" ], "author": { "name": "Andrea Arcangeli", "email": "aarcange@redhat.com", "time": "Mon Aug 09 17:19:10 2010 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Aug 09 20:44:59 2010 -0700" }, "message": "rmap: resurrect page_address_in_vma anon_vma check\n\nWith root anon-vma it\u0027s trivial to keep doing the usual check as in\nold-anon-vma code.\n\nSigned-off-by: Andrea Arcangeli \u003caarcange@redhat.com\u003e\nSigned-off-by: Rik van Riel \u003criel@redhat.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "288468c334e98aacbb7e2fb8bde6bc1adcd55e05", "tree": "f64cfebd7fedfd4e53fd5d4474048d5475a339b9", "parents": [ "ba6f0ff3981e6263ab81ac512f04cca55b85ec81" ], "author": { "name": "Andrea Arcangeli", "email": "aarcange@redhat.com", "time": "Mon Aug 09 17:19:09 2010 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Aug 09 20:44:58 2010 -0700" }, "message": "rmap: always use anon_vma root pointer\n\nAlways use anon_vma-\u003eroot pointer instead of anon_vma_chain.prev.\n\nAlso optimize the map-paths, if a mapping is already established no need\nto overwrite it with root anon-vma list, we can keep the more finegrined\nanon-vma and skip the overwrite: see the PageAnon check in !exclusive\ncase. This is also the optimization that hidden the ksm bug as this tends\nto make ksm_might_need_to_copy skip the copy, but only the proper fix to\nksm_might_need_to_copy guarantees not triggering the ksm bug unless ksm is\nin use. this is an optimization only...\n\n[akpm@linux-foundation.org: coding-style fixes]\nSigned-off-by: Andrea Arcangeli \u003caarcange@redhat.com\u003e\nSigned-off-by: Rik van Riel \u003criel@redhat.com\u003e\n[kamezawa.hiroyu@jp.fujitsu.com: fix false positive BUG_ON in __page_set_anon_rmap]\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "26ba0cb63cb8df4e45394227f33c938920b11b88", "tree": "131b785dc7fb0102ee4fc4f56a1ae948b9861501", "parents": [ "5e549e989f94de0596b8149a90e0088e7d4d7c97" ], "author": { "name": "Andrea Arcangeli", "email": "aarcange@redhat.com", "time": "Mon Aug 09 17:19:08 2010 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Aug 09 20:44:58 2010 -0700" }, "message": "rmap: always add new vmas at the end\n\nMake sure to always add new VMAs at the end of the list. This is\nimportant so rmap_walk does not miss a VMA that was created during the\nrmap_walk.\n\nThe old code got this right most of the time due to luck, but was buggy\nwhen anon_vma_prepare reused a mergeable anon_vma.\n\nSigned-off-by: Andrea Arcangeli \u003caarcange@redhat.com\u003e\nSigned-off-by: Rik van Riel \u003criel@redhat.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "76545066c8521f3e32c849744744842b4df25b79", "tree": "978b6b003f63e1e22618586b7d9c2dd8ef363614", "parents": [ "012f18004da33ba672e3c60838cc4898126174d3" ], "author": { "name": "Rik van Riel", "email": "riel@redhat.com", "time": "Mon Aug 09 17:18:41 2010 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Aug 09 20:44:55 2010 -0700" }, "message": "mm: extend KSM refcounts to the anon_vma root\n\nKSM reference counts can cause an anon_vma to exist after the processe it\nbelongs to have already exited. Because the anon_vma lock now lives in\nthe root anon_vma, we need to ensure that the root anon_vma stays around\nuntil after all the \"child\" anon_vmas have been freed.\n\nThe obvious way to do this is to have a \"child\" anon_vma take a reference\nto the root in anon_vma_fork. When the anon_vma is freed at munmap or\nprocess exit, we drop the refcount in anon_vma_unlink and possibly free\nthe root anon_vma.\n\nThe KSM anon_vma reference count function also needs to be modified to\ndeal with the possibility of freeing 2 levels of anon_vma. The easiest\nway to do this is to break out the KSM magic and make it generic.\n\nWhen compiling without CONFIG_KSM, this code is compiled out.\n\nSigned-off-by: Rik van Riel \u003criel@redhat.com\u003e\nTested-by: Larry Woodman \u003clwoodman@redhat.com\u003e\nAcked-by: Larry Woodman \u003clwoodman@redhat.com\u003e\nReviewed-by: Minchan Kim \u003cminchan.kim@gmail.com\u003e\nCc: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nAcked-by: Mel Gorman \u003cmel@csn.ul.ie\u003e\nAcked-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\nTested-by: Dave Young \u003chidave.darkstar@gmail.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "5c341ee1dfc8fe69d66b1c8b19e463c6d7201ae1", "tree": "41f05611f8b1d7562c2193ade8c089408f262a6b", "parents": [ "cba48b98f2348c814316c4b4f411a07a0e4a2bf9" ], "author": { "name": "Rik van Riel", "email": "riel@redhat.com", "time": "Mon Aug 09 17:18:39 2010 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Aug 09 20:44:55 2010 -0700" }, "message": "mm: track the root (oldest) anon_vma\n\nTrack the root (oldest) anon_vma in each anon_vma tree. Because we only\ntake the lock on the root anon_vma, we cannot use the lock on higher-up\nanon_vmas to lock anything. This makes it impossible to do an indirect\nlookup of the root anon_vma, since the data structures could go away from\nunder us.\n\nHowever, a direct pointer is safe because the root anon_vma is always the\nlast one that gets freed on munmap or exit, by virtue of the same_vma list\norder and unlink_anon_vmas walking the list forward.\n\n[akpm@linux-foundation.org: fix typo]\nSigned-off-by: Rik van Riel \u003criel@redhat.com\u003e\nAcked-by: Mel Gorman \u003cmel@csn.ul.ie\u003e\nAcked-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nTested-by: Larry Woodman \u003clwoodman@redhat.com\u003e\nAcked-by: Larry Woodman \u003clwoodman@redhat.com\u003e\nReviewed-by: Minchan Kim \u003cminchan.kim@gmail.com\u003e\nAcked-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "cba48b98f2348c814316c4b4f411a07a0e4a2bf9", "tree": "49c0426f8d41cb147722305c2c3495dd515c3253", "parents": [ "bb4a340e075b7897ece109686bfa177f8518d2db" ], "author": { "name": "Rik van Riel", "email": "riel@redhat.com", "time": "Mon Aug 09 17:18:38 2010 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Aug 09 20:44:55 2010 -0700" }, "message": "mm: change direct call of spin_lock(anon_vma-\u003elock) to inline function\n\nSubsitute a direct call of spin_lock(anon_vma-\u003elock) with an inline\nfunction doing exactly the same.\n\nThis makes it easier to do the substitution to the root anon_vma lock in a\nfollowing patch.\n\nWe will deal with the handful of special locks (nested, dec_and_lock, etc)\nseparately.\n\nSigned-off-by: Rik van Riel \u003criel@redhat.com\u003e\nAcked-by: Mel Gorman \u003cmel@csn.ul.ie\u003e\nAcked-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nTested-by: Larry Woodman \u003clwoodman@redhat.com\u003e\nAcked-by: Larry Woodman \u003clwoodman@redhat.com\u003e\nReviewed-by: Minchan Kim \u003cminchan.kim@gmail.com\u003e\nAcked-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "a8bef8ff6ea15fa4c67433cab0f5f3484574ef7c", "tree": "3ea9c122e02f523379d4560ee2134124d097895c", "parents": [ "e9e96b39f932a065e14f5d5bab0797ae261d03b5" ], "author": { "name": "Mel Gorman", "email": "mel@csn.ul.ie", "time": "Mon May 24 14:32:24 2010 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue May 25 08:06:59 2010 -0700" }, "message": "mm: migration: avoid race between shift_arg_pages() and rmap_walk() during migration by not migrating temporary stacks\n\nPage migration requires rmap to be able to find all ptes mapping a page\nat all times, otherwise the migration entry can be instantiated, but it\nis possible to leave one behind if the second rmap_walk fails to find\nthe page. If this page is later faulted, migration_entry_to_page() will\ncall BUG because the page is locked indicating the page was migrated by\nthe migration PTE not cleaned up. For example\n\n kernel BUG at include/linux/swapops.h:105!\n invalid opcode: 0000 [#1] PREEMPT SMP\n ...\n Call Trace:\n [\u003cffffffff810e951a\u003e] handle_mm_fault+0x3f8/0x76a\n [\u003cffffffff8130c7a2\u003e] do_page_fault+0x44a/0x46e\n [\u003cffffffff813099b5\u003e] page_fault+0x25/0x30\n [\u003cffffffff8114de33\u003e] load_elf_binary+0x152a/0x192b\n [\u003cffffffff8111329b\u003e] search_binary_handler+0x173/0x313\n [\u003cffffffff81114896\u003e] do_execve+0x219/0x30a\n [\u003cffffffff8100a5c6\u003e] sys_execve+0x43/0x5e\n [\u003cffffffff8100320a\u003e] stub_execve+0x6a/0xc0\n RIP [\u003cffffffff811094ff\u003e] migration_entry_wait+0xc1/0x129\n\nThere is a race between shift_arg_pages and migration that triggers this\nbug. A temporary stack is setup during exec and later moved. If\nmigration moves a page in the temporary stack and the VMA is then removed\nbefore migration completes, the migration PTE may not be found leading to\na BUG when the stack is faulted.\n\nThis patch causes pages within the temporary stack during exec to be\nskipped by migration. It does this by marking the VMA covering the\ntemporary stack with an otherwise impossible combination of VMA flags.\nThese flags are cleared when the temporary stack is moved to its final\nlocation.\n\n[kamezawa.hiroyu@jp.fujitsu.com: idea for having migration skip temporary stacks]\nSigned-off-by: Mel Gorman \u003cmel@csn.ul.ie\u003e\nReviewed-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nReviewed-by: Rik van Riel \u003criel@redhat.com\u003e\nAcked-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\nCc: Minchan Kim \u003cminchan.kim@gmail.com\u003e\nCc: Christoph Lameter \u003ccl@linux.com\u003e\nCc: Andrea Arcangeli \u003caarcange@redhat.com\u003e\nCc: Rik van Riel \u003criel@redhat.com\u003e\nCc: Peter Zijlstra \u003cpeterz@infradead.org\u003e\nReviewed-by: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "7f60c214fd3a360461f3286c6908084f7f8b1950", "tree": "dba48cf988a22a40796187c7274f7903a288f7f4", "parents": [ "3f6c82728f4e31a97c3a1b32abccb512fed0b573" ], "author": { "name": "Mel Gorman", "email": "mel@csn.ul.ie", "time": "Mon May 24 14:32:18 2010 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue May 25 08:06:58 2010 -0700" }, "message": "mm: migration: share the anon_vma ref counts between KSM and page migration\n\nFor clarity of review, KSM and page migration have separate refcounts on\nthe anon_vma. While clear, this is a waste of memory. This patch gets\nKSM and page migration to share their toys in a spirit of harmony.\n\nSigned-off-by: Mel Gorman \u003cmel@csn.ul.ie\u003e\nReviewed-by: Minchan Kim \u003cminchan.kim@gmail.com\u003e\nReviewed-by: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nReviewed-by: Christoph Lameter \u003ccl@linux-foundation.org\u003e\nReviewed-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nCc: Rik van Riel \u003criel@redhat.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "3f6c82728f4e31a97c3a1b32abccb512fed0b573", "tree": "4b577e789a5daef91e40d10bc71c8134b3874ae8", "parents": [ "e325c90ffc13b698fa2814102e05275b21c26bec" ], "author": { "name": "Mel Gorman", "email": "mel@csn.ul.ie", "time": "Mon May 24 14:32:17 2010 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue May 25 08:06:58 2010 -0700" }, "message": "mm: migration: take a reference to the anon_vma before migrating\n\nThis patchset is a memory compaction mechanism that reduces external\nfragmentation memory by moving GFP_MOVABLE pages to a fewer number of\npageblocks. The term \"compaction\" was chosen as there are is a number of\nmechanisms that are not mutually exclusive that can be used to defragment\nmemory. For example, lumpy reclaim is a form of defragmentation as was\nslub \"defragmentation\" (really a form of targeted reclaim). Hence, this\nis called \"compaction\" to distinguish it from other forms of\ndefragmentation.\n\nIn this implementation, a full compaction run involves two scanners\noperating within a zone - a migration and a free scanner. The migration\nscanner starts at the beginning of a zone and finds all movable pages\nwithin one pageblock_nr_pages-sized area and isolates them on a\nmigratepages list. The free scanner begins at the end of the zone and\nsearches on a per-area basis for enough free pages to migrate all the\npages on the migratepages list. As each area is respectively migrated or\nexhausted of free pages, the scanners are advanced one area. A compaction\nrun completes within a zone when the two scanners meet.\n\nThis method is a bit primitive but is easy to understand and greater\nsophistication would require maintenance of counters on a per-pageblock\nbasis. This would have a big impact on allocator fast-paths to improve\ncompaction which is a poor trade-off.\n\nIt also does not try relocate virtually contiguous pages to be physically\ncontiguous. However, assuming transparent hugepages were in use, a\nhypothetical khugepaged might reuse compaction code to isolate free pages,\nsplit them and relocate userspace pages for promotion.\n\nMemory compaction can be triggered in one of three ways. It may be\ntriggered explicitly by writing any value to /proc/sys/vm/compact_memory\nand compacting all of memory. It can be triggered on a per-node basis by\nwriting any value to /sys/devices/system/node/nodeN/compact where N is the\nnode ID to be compacted. When a process fails to allocate a high-order\npage, it may compact memory in an attempt to satisfy the allocation\ninstead of entering direct reclaim. Explicit compaction does not finish\nuntil the two scanners meet and direct compaction ends if a suitable page\nbecomes available that would meet watermarks.\n\nThe series is in 14 patches. The first three are not \"core\" to the series\nbut are important pre-requisites.\n\nPatch 1 reference counts anon_vma for rmap_walk_anon(). Without this\n\tpatch, it\u0027s possible to use anon_vma after free if the caller is\n\tnot holding a VMA or mmap_sem for the pages in question. While\n\tthere should be no existing user that causes this problem,\n\tit\u0027s a requirement for memory compaction to be stable. The patch\n\tis at the start of the series for bisection reasons.\nPatch 2 merges the KSM and migrate counts. It could be merged with patch 1\n\tbut would be slightly harder to review.\nPatch 3 skips over unmapped anon pages during migration as there are no\n\tguarantees about the anon_vma existing. There is a window between\n\twhen a page was isolated and migration started during which anon_vma\n\tcould disappear.\nPatch 4 notes that PageSwapCache pages can still be migrated even if they\n\tare unmapped.\nPatch 5 allows CONFIG_MIGRATION to be set without CONFIG_NUMA\nPatch 6 exports a \"unusable free space index\" via debugfs. It\u0027s\n\ta measure of external fragmentation that takes the size of the\n\tallocation request into account. It can also be calculated from\n\tuserspace so can be dropped if requested\nPatch 7 exports a \"fragmentation index\" which only has meaning when an\n\tallocation request fails. It determines if an allocation failure\n\twould be due to a lack of memory or external fragmentation.\nPatch 8 moves the definition for LRU isolation modes for use by compaction\nPatch 9 is the compaction mechanism although it\u0027s unreachable at this point\nPatch 10 adds a means of compacting all of memory with a proc trgger\nPatch 11 adds a means of compacting a specific node with a sysfs trigger\nPatch 12 adds \"direct compaction\" before \"direct reclaim\" if it is\n\tdetermined there is a good chance of success.\nPatch 13 adds a sysctl that allows tuning of the threshold at which the\n\tkernel will compact or direct reclaim\nPatch 14 temporarily disables compaction if an allocation failure occurs\n\tafter compaction.\n\nTesting of compaction was in three stages. For the test, debugging,\npreempt, the sleep watchdog and lockdep were all enabled but nothing nasty\npopped out. min_free_kbytes was tuned as recommended by hugeadm to help\nfragmentation avoidance and high-order allocations. It was tested on X86,\nX86-64 and PPC64.\n\nThs first test represents one of the easiest cases that can be faced for\nlumpy reclaim or memory compaction.\n\n1. Machine freshly booted and configured for hugepage usage with\n\ta) hugeadm --create-global-mounts\n\tb) hugeadm --pool-pages-max DEFAULT:8G\n\tc) hugeadm --set-recommended-min_free_kbytes\n\td) hugeadm --set-recommended-shmmax\n\n\tThe min_free_kbytes here is important. Anti-fragmentation works best\n\twhen pageblocks don\u0027t mix. hugeadm knows how to calculate a value that\n\twill significantly reduce the worst of external-fragmentation-related\n\tevents as reported by the mm_page_alloc_extfrag tracepoint.\n\n2. Load up memory\n\ta) Start updatedb\n\tb) Create in parallel a X files of pagesize*128 in size. Wait\n\t until files are created. By parallel, I mean that 4096 instances\n\t of dd were launched, one after the other using \u0026. The crude\n\t objective being to mix filesystem metadata allocations with\n\t the buffer cache.\n\tc) Delete every second file so that pageblocks are likely to\n\t have holes\n\td) kill updatedb if it\u0027s still running\n\n\tAt this point, the system is quiet, memory is full but it\u0027s full with\n\tclean filesystem metadata and clean buffer cache that is unmapped.\n\tThis is readily migrated or discarded so you\u0027d expect lumpy reclaim\n\tto have no significant advantage over compaction but this is at\n\tthe POC stage.\n\n3. In increments, attempt to allocate 5% of memory as hugepages.\n\t Measure how long it took, how successful it was, how many\n\t direct reclaims took place and how how many compactions. Note\n\t the compaction figures might not fully add up as compactions\n\t can take place for orders other than the hugepage size\n\nX86\t\t\t\tvanilla\t\tcompaction\nFinal page count 913 916 (attempted 1002)\npages reclaimed 68296 9791\n\nX86-64\t\t\t\tvanilla\t\tcompaction\nFinal page count: 901 902 (attempted 1002)\nTotal pages reclaimed: 112599 53234\n\nPPC64\t\t\t\tvanilla\t\tcompaction\nFinal page count: 93 94 (attempted 110)\nTotal pages reclaimed: 103216 61838\n\nThere was not a dramatic improvement in success rates but it wouldn\u0027t be\nexpected in this case either. What was important is that fewer pages were\nreclaimed in all cases reducing the amount of IO required to satisfy a\nhuge page allocation.\n\nThe second tests were all performance related - kernbench, netperf, iozone\nand sysbench. None showed anything too remarkable.\n\nThe last test was a high-order allocation stress test. Many kernel\ncompiles are started to fill memory with a pressured mix of unmovable and\nmovable allocations. During this, an attempt is made to allocate 90% of\nmemory as huge pages - one at a time with small delays between attempts to\navoid flooding the IO queue.\n\n vanilla compaction\nPercentage of request allocated X86 98 99\nPercentage of request allocated X86-64 95 98\nPercentage of request allocated PPC64 55 70\n\nThis patch:\n\nrmap_walk_anon() does not use page_lock_anon_vma() for looking up and\nlocking an anon_vma and it does not appear to have sufficient locking to\nensure the anon_vma does not disappear from under it.\n\nThis patch copies an approach used by KSM to take a reference on the\nanon_vma while pages are being migrated. This should prevent rmap_walk()\nrunning into nasty surprises later because anon_vma has been freed.\n\nSigned-off-by: Mel Gorman \u003cmel@csn.ul.ie\u003e\nAcked-by: Rik van Riel \u003criel@redhat.com\u003e\nCc: Minchan Kim \u003cminchan.kim@gmail.com\u003e\nCc: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nCc: Christoph Lameter \u003ccl@linux-foundation.org\u003e\nCc: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "ab941e0fff3947b6dcc9c578d918d1bba54a6874", "tree": "5157de1b28370136fde227ecbd7fd2d38c15d30a", "parents": [ "4a6018f7f4f1075c1a5403b5ec0ee7262187b86c" ], "author": { "name": "Naoya Horiguchi", "email": "n-horiguchi@ah.jp.nec.com", "time": "Tue May 11 14:06:55 2010 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue May 11 17:33:42 2010 -0700" }, "message": "rmap: remove anon_vma check in page_address_in_vma()\n\nCurrently page_address_in_vma() compares vma-\u003eanon_vma and\npage_anon_vma(page) for parameter check, but in 2.6.34 a vma can have\nmultiple anon_vmas with anon_vma_chain, so current check does not work.\n(For anonymous page shared by multiple processes, some verified (page,vma)\npairs return -EFAULT wrongly.)\n\nWe can go to checking all anon_vmas in the \"same_vma\" chain, but it needs\nto meet lock requirement. Instead, we can remove anon_vma check safely\nbecause page_address_in_vma() assumes that page and vma are already\nchecked to belong to the identical process.\n\nSigned-off-by: Naoya Horiguchi \u003cn-horiguchi@ah.jp.nec.com\u003e\nReviewed-by: Rik van Riel \u003criel@redhat.com\u003e\nCc: Andi Kleen \u003candi@firstfloor.org\u003e\nCc: Andrea Arcangeli \u003caarcange@redhat.com\u003e\nCc: Mel Gorman \u003cmel@csn.ul.ie\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "31f2b0ebc01fd332cb0997f7ce9f9cde29af9e20", "tree": "fc9d4cb410052afcc56bb8442a2dbcb8950464a8", "parents": [ "93b4a44f3ad69520d605aace3f3486b8eb754b96" ], "author": { "name": "Oleg Nesterov", "email": "oleg@redhat.com", "time": "Fri Apr 23 13:18:01 2010 -0400" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Sat Apr 24 11:31:25 2010 -0700" }, "message": "rmap: anon_vma_prepare() can leak anon_vma_chain\n\nIf find_mergeable_anon_vma() succeeds but another thread installs\n-\u003eanon_vma before we take ptl, then allocated \u003d\u003d NULL but avc should be\nfreed. Change the code to check avc !\u003d NULL to detect this case.\n\nAlso, a couple of whitespace changes to make the critical section more\nvisible.\n\nSigned-off-by: Oleg Nesterov \u003coleg@redhat.com\u003e\nReviewed-by: Rik van Riel \u003criel@redhat.com\u003e\nCc: Hugh Dickins \u003chugh.dickins@tiscali.co.uk\u003e\nCc: Pete Zaitcev \u003czaitcev@redhat.com\u003e\nCc: Borislav Petkov \u003cbp@alien8.de\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "e8a03feb54ca7f1768bbdc2b491f9ef654e6d01d", "tree": "1ce113d18057e0870e0816f272e21b6716ef321f", "parents": [ "9b030e2006546366c832911ca5eb9e785408795b" ], "author": { "name": "Rik van Riel", "email": "riel@redhat.com", "time": "Wed Apr 14 17:59:28 2010 -0400" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Apr 19 16:28:20 2010 -0700" }, "message": "rmap: add exclusively owned pages to the newest anon_vma\n\nThe recent anon_vma fixes cause many anonymous pages to end up\nin the parent process anon_vma, even when the page is exclusively\nowned by the current process.\n\nAdding exclusively owned anonymous pages to the top anon_vma\nreduces rmap scanning overhead, especially in workloads with\nforking servers.\n\nThis patch adds a parameter to __page_set_anon_rmap that can\nbe used to indicate whether or not the added page is exclusively\nowned by the current process.\n\nPages added through page_add_new_anon_rmap are exclusively\nowned by the current process, and can be added to the top\nanon_vma.\n\nPages added through page_add_anon_rmap can be either shared\nor exclusively owned, so we do the conservative thing and\nadd it to the oldest anon_vma.\n\nA next step would be to add the exclusive parameter to\npage_add_anon_rmap, to be used from functions where we do\nknow for sure whether a page is exclusively owned.\n\nSigned-off-by: Rik van Riel \u003criel@redhat.com\u003e\nReviewed-by: Johannes Weiner \u003channes@cmpxchg.org\u003e\nLightly-tested-by: Borislav Petkov \u003cbp@alien8.de\u003e\nReviewed-by: Minchan Kim \u003cminchan.kim@gmail.com\u003e\n[ Edited to look nicer - Linus ]\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "ea90002b0fa7bdee86ec22eba1d951f30bf043a6", "tree": "7620aa0da5b7314769b177dd0934bb87fe7c993b", "parents": [ "646d87b481dab4ba8301716600dfd276605b0ab0" ], "author": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Apr 12 12:44:29 2010 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Apr 12 17:54:13 2010 -0700" }, "message": "anonvma: when setting up page-\u003emapping, we need to pick the _oldest_ anonvma\n\nOtherwise we might be mapping in a page in a new mapping, but that page\n(through the swapcache) would later be mapped into an old mapping too.\nThe page-\u003emapping must be the case that works for everybody, not just\nthe mapping that happened to page it in first.\n\nHere\u0027s the scenario:\n\n - page gets allocated/mapped by process A. Let\u0027s call the anon_vma we\n associate the page with \u0027A\u0027 to keep it easy to track.\n\n - Process A forks, creating process B. The anon_vma in B is \u0027B\u0027, and has\n a chain that looks like \u0027B\u0027 -\u003e \u0027A\u0027. Everything is fine.\n\n - Swapping happens. The page (with mapping pointing to \u0027A\u0027) gets swapped\n out (perhaps not to disk - it\u0027s enough to assume that it\u0027s just not\n mapped any more, and lives entirely in the swap-cache)\n\n - Process B pages it in, which goes like this:\n\n do_swap_page -\u003e\n page \u003d lookup_swap_cache(entry);\n ...\n set_pte_at(mm, address, page_table, pte);\n page_add_anon_rmap(page, vma, address);\n\n And think about what happens here!\n\n In particular, what happens is that this will now be the \"first\"\n mapping of that page, so page_add_anon_rmap() used to do\n\n if (first)\n __page_set_anon_rmap(page, vma, address);\n\n and notice what anon_vma it will use? It will use the anon_vma for\n process B!\n\n What happens then? Trivial: process \u0027A\u0027 also pages it in (nothing\n happens, it\u0027s not the first mapping), and then process \u0027B\u0027 execve\u0027s\n or exits or unmaps, making anon_vma B go away.\n\n End result: process A has a page that points to anon_vma B, but\n anon_vma B does not exist any more. This can go on forever. Forget\n about RCU grace periods, forget about locking, forget anything like\n that. The bug is simply that page-\u003emapping points to an anon_vma\n that was correct at one point, but was _not_ the one that was shared\n by all users of that possible mapping.\n\nChanging it to always use the deepest anon_vma in the anonvma chain gets\nus to the safest model.\n\nThis can be improved in certain cases: if we know the page is private to\njust this particular mapping (for example, it\u0027s a new page, or it is the\nonly swapcache entry), we could pick the top (most specific) anon_vma.\n\nBut that\u0027s a future optimization. Make it _work_ reliably first.\n\nReviewed-by: Rik van Riel \u003criel@redhat.com\u003e\nAcked-by: Johannes Weiner \u003channes@cmpxchg.org\u003e\nTested-by: Borislav Petkov \u003cbp@alien8.de\u003e [ \"What do you know, I think you fixed it!\" ]\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "646d87b481dab4ba8301716600dfd276605b0ab0", "tree": "d457ef34537cf91ddc91dafc4842de9f43ed9555", "parents": [ "287d97ac032136724143cde8d5964b414d562ee3" ], "author": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Sun Apr 11 17:15:03 2010 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Apr 12 17:54:12 2010 -0700" }, "message": "anon_vma: clone the anon_vma chain in the right order\n\nWe want to walk the chain in reverse order when cloning it, so that the\norder of the result chain will be the same as the order in the source\nchain. When we add entries to the chain, they go at the head of the\nchain, so we want to add the source head last.\n\nReviewed-by: Rik van Riel \u003criel@redhat.com\u003e\nAcked-by: Johannes Weiner \u003channes@cmpxchg.org\u003e\nTested-by: Borislav Petkov \u003cbp@alien8.de\u003e [ \"No, it still oopses\" ]\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "4946d54cb55e86a156216fcfeed5568514b0830f", "tree": "a27a670f2cbe7d689588af24c6c9cda82690c7c2", "parents": [ "db217dece3003df0841bacf9556b5c06aa097dae" ], "author": { "name": "Rik van Riel", "email": "riel@redhat.com", "time": "Mon Apr 05 12:13:33 2010 -0400" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Apr 05 09:15:51 2010 -0700" }, "message": "rmap: fix anon_vma_fork() memory leak\n\nFix a memory leak in anon_vma_fork(), where we fail to tear down the\nanon_vmas attached to the new VMA in case setting up the new anon_vma\nfails.\n\nThis bug also has the potential to leave behind anon_vma_chain structs\nwith pointers to invalid memory.\n\nReported-by: Minchan Kim \u003cminchan.kim@gmail.com\u003e\nSigned-off-by: Rik van Riel \u003criel@redhat.com\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "645747462435d84c6c6a64269ed49cc3015f753d", "tree": "4cbbddcddd429704dd4f205f6371bb329dcb0ff1", "parents": [ "31c0569c3b0b6cc8a867ac6665ca081553f7984c" ], "author": { "name": "Johannes Weiner", "email": "hannes@cmpxchg.org", "time": "Fri Mar 05 13:42:22 2010 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Sat Mar 06 11:26:27 2010 -0800" }, "message": "vmscan: detect mapped file pages used only once\n\nThe VM currently assumes that an inactive, mapped and referenced file page\nis in use and promotes it to the active list.\n\nHowever, every mapped file page starts out like this and thus a problem\narises when workloads create a stream of such pages that are used only for\na short time. By flooding the active list with those pages, the VM\nquickly gets into trouble finding eligible reclaim canditates. The result\nis long allocation latencies and eviction of the wrong pages.\n\nThis patch reuses the PG_referenced page flag (used for unmapped file\npages) to implement a usage detection that scales with the speed of LRU\nlist cycling (i.e. memory pressure).\n\nIf the scanner encounters those pages, the flag is set and the page cycled\nagain on the inactive list. Only if it returns with another page table\nreference it is activated. Otherwise it is reclaimed as \u0027not recently\nused cache\u0027.\n\nThis effectively changes the minimum lifetime of a used-once mapped file\npage from a full memory cycle to an inactive list cycle, which allows it\nto occur in linear streams without affecting the stable working set of the\nsystem.\n\nSigned-off-by: Johannes Weiner \u003channes@cmpxchg.org\u003e\nReviewed-by: Rik van Riel \u003criel@redhat.com\u003e\nCc: Minchan Kim \u003cminchan.kim@gmail.com\u003e\nCc: OSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nCc: Lee Schermerhorn \u003clee.schermerhorn@hp.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "fc148a5f7e0532750c312385c7ee9fa3e9311f34", "tree": "dfd132ed225a113f73c61f5e2018e5644bb3f677", "parents": [ "c44b674323f4a2480dbeb65d4b487fa5f06f49e0" ], "author": { "name": "Rik van Riel", "email": "riel@redhat.com", "time": "Fri Mar 05 13:42:10 2010 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Sat Mar 06 11:26:26 2010 -0800" }, "message": "mm: remove VM_LOCK_RMAP code\n\nWhen a VMA is in an inconsistent state during setup or teardown, the worst\nthat can happen is that the rmap code will not be able to find the page.\n\nThe mapping is in the process of being torn down (PTEs just got\ninvalidated by munmap), or set up (no PTEs have been instantiated yet).\n\nIt is also impossible for the rmap code to follow a pointer to an already\nfreed VMA, because the rmap code holds the anon_vma-\u003elock, which the VMA\nteardown code needs to take before the VMA is removed from the anon_vma\nchain.\n\nHence, we should not need the VM_LOCK_RMAP locking at all.\n\nSigned-off-by: Rik van Riel \u003criel@redhat.com\u003e\nCc: Nick Piggin \u003cnpiggin@suse.de\u003e\nCc: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nCc: Larry Woodman \u003clwoodman@redhat.com\u003e\nCc: Lee Schermerhorn \u003cLee.Schermerhorn@hp.com\u003e\nCc: Andrea Arcangeli \u003caarcange@redhat.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "c44b674323f4a2480dbeb65d4b487fa5f06f49e0", "tree": "b753050e6752eb2fc961ad3ea5dfdf88ef88364d", "parents": [ "033a64b56aed798991de18d226085dfb1ccd858d" ], "author": { "name": "Rik van Riel", "email": "riel@redhat.com", "time": "Fri Mar 05 13:42:09 2010 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Sat Mar 06 11:26:26 2010 -0800" }, "message": "rmap: move exclusively owned pages to own anon_vma in do_wp_page()\n\nWhen the parent process breaks the COW on a page, both the original which\nis mapped at child and the new page which is mapped parent end up in that\nsame anon_vma. Generally this won\u0027t be a problem, but for some workloads\nit could preserve the O(N) rmap scanning complexity.\n\nA simple fix is to ensure that, when a page which is mapped child gets\nreused in do_wp_page, because we already are the exclusive owner, the page\ngets moved to our own exclusive child\u0027s anon_vma.\n\nSigned-off-by: Rik van Riel \u003criel@redhat.com\u003e\nCc: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nCc: Larry Woodman \u003clwoodman@redhat.com\u003e\nCc: Lee Schermerhorn \u003cLee.Schermerhorn@hp.com\u003e\nReviewed-by: Minchan Kim \u003cminchan.kim@gmail.com\u003e\nCc: Andrea Arcangeli \u003caarcange@redhat.com\u003e\nCc: Hugh Dickins \u003chugh.dickins@tiscali.co.uk\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "033a64b56aed798991de18d226085dfb1ccd858d", "tree": "edf27f0868d1b16e0d1e1e41876b668d4a2f215d", "parents": [ "5beb49305251e5669852ed541e8e2f2f7696c53e" ], "author": { "name": "Rik van Riel", "email": "riel@redhat.com", "time": "Fri Mar 05 13:42:08 2010 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Sat Mar 06 11:26:26 2010 -0800" }, "message": "rmap: remove obsolete check from __page_check_anon_rmap()\n\nWhen an anonymous page is inherited from a parent process, the\nvma-\u003eanon_vma can differ from the page anon_vma. This can trip up\n__page_check_anon_rmap, which is indirectly called from do_swap_page().\n\nRemove that obsolete check to prevent an oops.\n\nSigned-off-by: Rik van Riel \u003criel@redhat.com\u003e\nCc: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nCc: Larry Woodman \u003clwoodman@redhat.com\u003e\nCc: Lee Schermerhorn \u003cLee.Schermerhorn@hp.com\u003e\nReviewed-by: Minchan Kim \u003cminchan.kim@gmail.com\u003e\nCc: Andrea Arcangeli \u003caarcange@redhat.com\u003e\nCc: Hugh Dickins \u003chugh.dickins@tiscali.co.uk\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "5beb49305251e5669852ed541e8e2f2f7696c53e", "tree": "46457450a22f23938b24904aeba5d4ada2f53b20", "parents": [ "648bcc771145172a14bc35eeb849ed08f6aa4f1e" ], "author": { "name": "Rik van Riel", "email": "riel@redhat.com", "time": "Fri Mar 05 13:42:07 2010 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Sat Mar 06 11:26:26 2010 -0800" }, "message": "mm: change anon_vma linking to fix multi-process server scalability issue\n\nThe old anon_vma code can lead to scalability issues with heavily forking\nworkloads. Specifically, each anon_vma will be shared between the parent\nprocess and all its child processes.\n\nIn a workload with 1000 child processes and a VMA with 1000 anonymous\npages per process that get COWed, this leads to a system with a million\nanonymous pages in the same anon_vma, each of which is mapped in just one\nof the 1000 processes. However, the current rmap code needs to walk them\nall, leading to O(N) scanning complexity for each page.\n\nThis can result in systems where one CPU is walking the page tables of\n1000 processes in page_referenced_one, while all other CPUs are stuck on\nthe anon_vma lock. This leads to catastrophic failure for a benchmark\nlike AIM7, where the total number of processes can reach in the tens of\nthousands. Real workloads are still a factor 10 less process intensive\nthan AIM7, but they are catching up.\n\nThis patch changes the way anon_vmas and VMAs are linked, which allows us\nto associate multiple anon_vmas with a VMA. At fork time, each child\nprocess gets its own anon_vmas, in which its COWed pages will be\ninstantiated. The parents\u0027 anon_vma is also linked to the VMA, because\nnon-COWed pages could be present in any of the children.\n\nThis reduces rmap scanning complexity to O(1) for the pages of the 1000\nchild processes, with O(N) complexity for at most 1/N pages in the system.\n This reduces the average scanning cost in heavily forking workloads from\nO(N) to 2.\n\nThe only real complexity in this patch stems from the fact that linking a\nVMA to anon_vmas now involves memory allocations. This means vma_adjust\ncan fail, if it needs to attach a VMA to anon_vma structures. This in\nturn means error handling needs to be added to the calling functions.\n\nA second source of complexity is that, because there can be multiple\nanon_vmas, the anon_vma linking in vma_adjust can no longer be done under\n\"the\" anon_vma lock. To prevent the rmap code from walking up an\nincomplete VMA, this patch introduces the VM_LOCK_RMAP VMA flag. This bit\nflag uses the same slot as the NOMMU VM_MAPPED_COPY, with an ifdef in mm.h\nto make sure it is impossible to compile a kernel that needs both symbolic\nvalues for the same bitflag.\n\nSome test results:\n\nWithout the anon_vma changes, when AIM7 hits around 9.7k users (on a test\nbox with 16GB RAM and not quite enough IO), the system ends up running\n\u003e99% in system time, with every CPU on the same anon_vma lock in the\npageout code.\n\nWith these changes, AIM7 hits the cross-over point around 29.7k users.\nThis happens with ~99% IO wait time, there never seems to be any spike in\nsystem time. The anon_vma lock contention appears to be resolved.\n\n[akpm@linux-foundation.org: cleanups]\nSigned-off-by: Rik van Riel \u003criel@redhat.com\u003e\nCc: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nCc: Larry Woodman \u003clwoodman@redhat.com\u003e\nCc: Lee Schermerhorn \u003cLee.Schermerhorn@hp.com\u003e\nCc: Minchan Kim \u003cminchan.kim@gmail.com\u003e\nCc: Andrea Arcangeli \u003caarcange@redhat.com\u003e\nCc: Hugh Dickins \u003chugh.dickins@tiscali.co.uk\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "b084d4353ff99d824d3bc5a5c2c22c70b1fba722", "tree": "8178db2b337fc8a36e6ca2e1fc2e7d7473957e27", "parents": [ "34e55232e59f7b19050267a05ff1226e5cd122a5" ], "author": { "name": "KAMEZAWA Hiroyuki", "email": "kamezawa.hiroyu@jp.fujitsu.com", "time": "Fri Mar 05 13:41:42 2010 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Sat Mar 06 11:26:24 2010 -0800" }, "message": "mm: count swap usage\n\nA frequent questions from users about memory management is what numbers of\nswap ents are user for processes. And this information will give some\nhints to oom-killer.\n\nBesides we can count the number of swapents per a process by scanning\n/proc/\u003cpid\u003e/smaps, this is very slow and not good for usual process\ninformation handler which works like \u0027ps\u0027 or \u0027top\u0027. (ps or top is now\nenough slow..)\n\nThis patch adds a counter of swapents to mm_counter and update is at each\nswap events. Information is exported via /proc/\u003cpid\u003e/status file as\n\n[kamezawa@bluextal memory]$ cat /proc/self/status\nName: cat\nState: R (running)\nTgid: 2910\nPid: 2910\nPPid: 2823\nTracerPid: 0\nUid: 500 500 500 500\nGid: 500 500 500 500\nFDSize: 256\nGroups: 500\nVmPeak: 82696 kB\nVmSize: 82696 kB\nVmLck: 0 kB\nVmHWM: 432 kB\nVmRSS: 432 kB\nVmData: 172 kB\nVmStk: 84 kB\nVmExe: 48 kB\nVmLib: 1568 kB\nVmPTE: 40 kB\nVmSwap: 0 kB \u003c\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d this.\n\n[akpm@linux-foundation.org: coding-style fixes]\nSigned-off-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nReviewed-by: Minchan Kim \u003cminchan.kim@gmail.com\u003e\nReviewed-by: Christoph Lameter \u003ccl@linux-foundation.org\u003e\nCc: Lee Schermerhorn \u003clee.schermerhorn@hp.com\u003e\nCc: David Rientjes \u003crientjes@google.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "d559db086ff5be9bcc259e5aa50bf3d881eaf1d1", "tree": "aa968c8a4093234e4623a34c0415bf9d8683671c", "parents": [ "19b629f581320999ddb9f6597051b79cdb53459c" ], "author": { "name": "KAMEZAWA Hiroyuki", "email": "kamezawa.hiroyu@jp.fujitsu.com", "time": "Fri Mar 05 13:41:39 2010 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Sat Mar 06 11:26:23 2010 -0800" }, "message": "mm: clean up mm_counter\n\nPresently, per-mm statistics counter is defined by macro in sched.h\n\nThis patch modifies it to\n - defined in mm.h as inlinf functions\n - use array instead of macro\u0027s name creation.\n\nThis patch is for reducing patch size in future patch to modify\nimplementation of per-mm counter.\n\nSigned-off-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nReviewed-by: Minchan Kim \u003cminchan.kim@gmail.com\u003e\nCc: Christoph Lameter \u003ccl@linux-foundation.org\u003e\nCc: Lee Schermerhorn \u003clee.schermerhorn@hp.com\u003e\nCc: David Rientjes \u003crientjes@google.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "d8046582d5ee24448800e71c6933fdb6813aa062", "tree": "857d014a850deee5ddb6da6550d81ce0122f03b1", "parents": [ "cdec2e4265dfa09490601b00aeabd8a8d4af30f0" ], "author": { "name": "KAMEZAWA Hiroyuki", "email": "kamezawa.hiroyu@jp.fujitsu.com", "time": "Tue Dec 15 16:47:09 2009 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Wed Dec 16 07:20:07 2009 -0800" }, "message": "memcg: make memcg\u0027s file mapped consistent with global VM\n\nIn global VM, FILE_MAPPED is used but memcg uses MAPPED_FILE. This makes\ngrep difficult. Replace memcg\u0027s MAPPED_FILE with FILE_MAPPED\n\nAnd in global VM, mapped shared memory is accounted into FILE_MAPPED.\nBut memcg doesn\u0027t. fix it.\nNote:\n page_is_file_cache() just checks SwapBacked or not.\n So, we need to check PageAnon.\n\nCc: Balbir Singh \u003cbalbir@in.ibm.com\u003e\nReviewed-by: Daisuke Nishimura \u003cnishimura@mxp.nes.nec.co.jp\u003e\nSigned-off-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "caed0f486e582eeeb6e3546417fd758230fe4ad9", "tree": "203d4724dcfaae3ad4b349e1971bb3efc0da7db2", "parents": [ "23ce932a5e3ec3b9f06e92c8797d834d43abfb0f" ], "author": { "name": "KOSAKI Motohiro", "email": "kosaki.motohiro@jp.fujitsu.com", "time": "Mon Dec 14 17:59:45 2009 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Dec 15 08:53:20 2009 -0800" }, "message": "mm: simplify try_to_unmap_one()\n\nSWAP_MLOCK mean \"We marked the page as PG_MLOCK, please move it to\nunevictable-lru\". So, following code is easy confusable.\n\n if (vma-\u003evm_flags \u0026 VM_LOCKED) {\n ret \u003d SWAP_MLOCK;\n goto out_unmap;\n }\n\nPlus, if the VMA doesn\u0027t have VM_LOCKED, We don\u0027t need to check\nthe needed of calling mlock_vma_page().\n\nAlso, add some commentary to try_to_unmap_one().\n\nAcked-by: Hugh Dickins \u003chugh.dickins@tiscali.co.uk\u003e\nSigned-off-by: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "e9995ef978a7d5296fe04a9a2c5ca6e66d8bb4e5", "tree": "df4324273856e06b8277b7e4a0fa9289eb8e6385", "parents": [ "407f9c8b0889ced1dbe2f9157e4e60c61329d5c9" ], "author": { "name": "Hugh Dickins", "email": "hugh.dickins@tiscali.co.uk", "time": "Mon Dec 14 17:59:31 2009 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Dec 15 08:53:20 2009 -0800" }, "message": "ksm: rmap_walk to remove_migation_ptes\n\nA side-effect of making ksm pages swappable is that they have to be placed\non the LRUs: which then exposes them to isolate_lru_page() and hence to\npage migration.\n\nAdd rmap_walk() for remove_migration_ptes() to use: rmap_walk_anon() and\nrmap_walk_file() in rmap.c, but rmap_walk_ksm() in ksm.c. Perhaps some\nconsolidation with existing code is possible, but don\u0027t attempt that yet\n(try_to_unmap needs to handle nonlinears, but migration pte removal does\nnot).\n\nrmap_walk() is sadly less general than it appears: rmap_walk_anon(), like\nremove_anon_migration_ptes() which it replaces, avoids calling\npage_lock_anon_vma(), because that includes a page_mapped() test which\nfails when all migration ptes are in place. That was valid when NUMA page\nmigration was introduced (holding mmap_sem provided the missing guarantee\nthat anon_vma\u0027s slab had not already been destroyed), but I believe not\nvalid in the memory hotremove case added since.\n\nFor now do the same as before, and consider the best way to fix that\nunlikely race later on. When fixed, we can probably use rmap_walk() on\nhwpoisoned ksm pages too: for now, they remain among hwpoison\u0027s various\nexceptions (its PageKsm test comes before the page is locked, but its\npage_lock_anon_vma fails safely if an anon gets upgraded).\n\nSigned-off-by: Hugh Dickins \u003chugh.dickins@tiscali.co.uk\u003e\nCc: Izik Eidus \u003cieidus@redhat.com\u003e\nCc: Andrea Arcangeli \u003caarcange@redhat.com\u003e\nCc: Chris Wright \u003cchrisw@redhat.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "80e148226028257ec0a1909d99b2c40d0ffe17f2", "tree": "1e3cae42144f5c80e215ba254e01bd6847ba1b36", "parents": [ "4035c07a895974d0ac06a56fe870ad293fc451a7" ], "author": { "name": "Hugh Dickins", "email": "hugh.dickins@tiscali.co.uk", "time": "Mon Dec 14 17:59:29 2009 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Dec 15 08:53:19 2009 -0800" }, "message": "ksm: share anon page without allocating\n\nWhen ksm pages were unswappable, it made no sense to include them in mem\ncgroup accounting; but now that they are swappable (although I see no\nstrict logical connection) the principle of least surprise implies that\nthey should be accounted (with the usual dissatisfaction, that a shared\npage is accounted to only one of the cgroups using it).\n\nThis patch was intended to add mem cgroup accounting where necessary; but\nturned inside out, it now avoids allocating a ksm page, instead upgrading\nan anon page to ksm - which brings its existing mem cgroup accounting with\nit. Thus mem cgroups don\u0027t appear in the patch at all.\n\nThis upgrade from PageAnon to PageKsm takes place under page lock (via a\nsomewhat hacky NULL kpage interface), and audit showed only one place\nwhich needed to cope with the race - page_referenced() is sometimes used\nwithout page lock, so page_lock_anon_vma() needs an ACCESS_ONCE() to be\nsure of getting anon_vma and flags together (no problem if the page goes\nksm an instant after, the integrity of that anon_vma list is unaffected).\n\nSigned-off-by: Hugh Dickins \u003chugh.dickins@tiscali.co.uk\u003e\nCc: Izik Eidus \u003cieidus@redhat.com\u003e\nCc: Andrea Arcangeli \u003caarcange@redhat.com\u003e\nCc: Chris Wright \u003cchrisw@redhat.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "db114b83ab6064d9b1d6ec5650e096c89bd95e25", "tree": "15e289b25fec011238f6838c6aafa1ff5e293224", "parents": [ "5ad6468801d28c4d4ac9f48ec19297817c915f6a" ], "author": { "name": "Hugh Dickins", "email": "hugh.dickins@tiscali.co.uk", "time": "Mon Dec 14 17:59:25 2009 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Dec 15 08:53:19 2009 -0800" }, "message": "ksm: hold anon_vma in rmap_item\n\nFor full functionality, page_referenced_one() and try_to_unmap_one() need\nto know the vma: to pass vma down to arch-dependent flushes, or to observe\nVM_LOCKED or VM_EXEC. But KSM keeps no record of vma: nor can it, since\nvmas get split and merged without its knowledge.\n\nInstead, note page\u0027s anon_vma in its rmap_item when adding to stable tree:\nall the vmas which might map that page are listed by its anon_vma.\n\npage_referenced_ksm() and try_to_unmap_ksm() then traverse the anon_vma,\nfirst to find the probable vma, that which matches rmap_item\u0027s mm; but if\nthat is not enough to locate all instances, traverse again to try the\nothers. This catches those occasions when fork has duplicated a pte of a\nksm page, but ksmd has not yet come around to assign it an rmap_item.\n\nBut each rmap_item in the stable tree which refers to an anon_vma needs to\ntake a reference to it. Andrea\u0027s anon_vma design cleverly avoided a\nreference count (an anon_vma was free when its list of vmas was empty),\nbut KSM now needs to add that. Is a 32-bit count sufficient? I believe\nso - the anon_vma is only free when both count is 0 and list is empty.\n\nSigned-off-by: Hugh Dickins \u003chugh.dickins@tiscali.co.uk\u003e\nCc: Izik Eidus \u003cieidus@redhat.com\u003e\nCc: Andrea Arcangeli \u003caarcange@redhat.com\u003e\nCc: Chris Wright \u003cchrisw@redhat.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "5ad6468801d28c4d4ac9f48ec19297817c915f6a", "tree": "edd8dc48693f43278d6fe1614aca2bf660d4dc10", "parents": [ "73848b4684e84a84cfd1555af78d41158f31e16b" ], "author": { "name": "Hugh Dickins", "email": "hugh.dickins@tiscali.co.uk", "time": "Mon Dec 14 17:59:24 2009 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Dec 15 08:53:19 2009 -0800" }, "message": "ksm: let shared pages be swappable\n\nInitial implementation for swapping out KSM\u0027s shared pages: add\npage_referenced_ksm() and try_to_unmap_ksm(), which rmap.c calls when\nfaced with a PageKsm page.\n\nMost of what\u0027s needed can be got from the rmap_items listed from the\nstable_node of the ksm page, without discovering the actual vma: so in\nthis patch just fake up a struct vma for page_referenced_one() or\ntry_to_unmap_one(), then refine that in the next patch.\n\nAdd VM_NONLINEAR to ksm_madvise()\u0027s list of exclusions: it has always been\nimplicit there (being only set with VM_SHARED, already excluded), but\nlet\u0027s make it explicit, to help justify the lack of nonlinear unmap.\n\nRely on the page lock to protect against concurrent modifications to that\npage\u0027s node of the stable tree.\n\nThe awkward part is not swapout but swapin: do_swap_page() and\npage_add_anon_rmap() now have to allow for new possibilities - perhaps a\nksm page still in swapcache, perhaps a swapcache page associated with one\nlocation in one anon_vma now needed for another location or anon_vma.\n(And the vma might even be no longer VM_MERGEABLE when that happens.)\n\nksm_might_need_to_copy() checks for that case, and supplies a duplicate\npage when necessary, simply leaving it to a subsequent pass of ksmd to\nrediscover the identity and merge them back into one ksm page.\nDisappointingly primitive: but the alternative would have to accumulate\nunswappable info about the swapped out ksm pages, limiting swappability.\n\nRemove page_add_ksm_rmap(): page_add_anon_rmap() now has to allow for the\nparticular case it was handling, so just use it instead.\n\nSigned-off-by: Hugh Dickins \u003chugh.dickins@tiscali.co.uk\u003e\nCc: Izik Eidus \u003cieidus@redhat.com\u003e\nCc: Andrea Arcangeli \u003caarcange@redhat.com\u003e\nCc: Chris Wright \u003cchrisw@redhat.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "1cb1729b1385884648170d9d1d3aa0c66780d64b", "tree": "57b9e58d70f791f2737997bf56a2dad98378d54d", "parents": [ "af8e3354b4bbd1ee5a3a55d11a5e1fe37e77f0ba" ], "author": { "name": "Hugh Dickins", "email": "hugh.dickins@tiscali.co.uk", "time": "Mon Dec 14 17:59:01 2009 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Dec 15 08:53:17 2009 -0800" }, "message": "mm: pass address down to rmap ones\n\nKSM swapping will know where page_referenced_one() and try_to_unmap_one()\nshould look. It could hack page-\u003eindex to get them to do what it wants,\nbut it seems cleaner now to pass the address down to them.\n\nMake the same change to page_mkclean_one(), since it follows the same\npattern; but there\u0027s no real need in its case.\n\nSigned-off-by: Hugh Dickins \u003chugh.dickins@tiscali.co.uk\u003e\nCc: Izik Eidus \u003cieidus@redhat.com\u003e\nCc: Andrea Arcangeli \u003caarcange@redhat.com\u003e\nCc: Nick Piggin \u003cnpiggin@suse.de\u003e\nCc: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nCc: Rik van Riel \u003criel@redhat.com\u003e\nCc: Lee Schermerhorn \u003cLee.Schermerhorn@hp.com\u003e\nCc: Andi Kleen \u003candi@firstfloor.org\u003e\nCc: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nCc: Wu Fengguang \u003cfengguang.wu@intel.com\u003e\nCc: Minchan Kim \u003cminchan.kim@gmail.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "af8e3354b4bbd1ee5a3a55d11a5e1fe37e77f0ba", "tree": "8dc0ece80878d00409d4662c5fd1e28cd7fbbdd8", "parents": [ "53f79acb6ecb648afd63e0f13deba167f1a934df" ], "author": { "name": "Hugh Dickins", "email": "hugh.dickins@tiscali.co.uk", "time": "Mon Dec 14 17:58:59 2009 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Dec 15 08:53:17 2009 -0800" }, "message": "mm: CONFIG_MMU for PG_mlocked\n\nRemove three degrees of obfuscation, left over from when we had\nCONFIG_UNEVICTABLE_LRU. MLOCK_PAGES is CONFIG_HAVE_MLOCKED_PAGE_BIT is\nCONFIG_HAVE_MLOCK is CONFIG_MMU. rmap.o (and memory-failure.o) are only\nbuilt when CONFIG_MMU, so don\u0027t need such conditions at all.\n\nSomehow, I feel no compulsion to remove the CONFIG_HAVE_MLOCK* lines from\n169 defconfigs: leave those to evolve in due course.\n\nSigned-off-by: Hugh Dickins \u003chugh.dickins@tiscali.co.uk\u003e\nCc: Izik Eidus \u003cieidus@redhat.com\u003e\nCc: Andrea Arcangeli \u003caarcange@redhat.com\u003e\nCc: Nick Piggin \u003cnpiggin@suse.de\u003e\nReviewed-by: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nCc: Rik van Riel \u003criel@redhat.com\u003e\nCc: Lee Schermerhorn \u003cLee.Schermerhorn@hp.com\u003e\nCc: Andi Kleen \u003candi@firstfloor.org\u003e\nCc: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nCc: Wu Fengguang \u003cfengguang.wu@intel.com\u003e\nCc: Minchan Kim \u003cminchan.kim@gmail.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "53f79acb6ecb648afd63e0f13deba167f1a934df", "tree": "48d9b998fa45c4fe510447d17cdc050f31be5e23", "parents": [ "3ca7b3c5b64d35fe02c35b5d44c2c58b49499fee" ], "author": { "name": "Hugh Dickins", "email": "hugh.dickins@tiscali.co.uk", "time": "Mon Dec 14 17:58:58 2009 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Dec 15 08:53:17 2009 -0800" }, "message": "mm: mlocking in try_to_unmap_one\n\nThere\u0027s contorted mlock/munlock handling in try_to_unmap_anon() and\ntry_to_unmap_file(), which we\u0027d prefer not to repeat for KSM swapping.\nSimplify it by moving it all down into try_to_unmap_one().\n\nOne thing is then lost, try_to_munlock()\u0027s distinction between when no vma\nholds the page mlocked, and when a vma does mlock it, but we could not get\nmmap_sem to set the page flag. But its only caller takes no interest in\nthat distinction (and is better testing SWAP_MLOCK anyway), so let\u0027s keep\nthe code simple and return SWAP_AGAIN for both cases.\n\ntry_to_unmap_file()\u0027s TTU_MUNLOCK nonlinear handling was particularly\namusing: once unravelled, it turns out to have been choosing between two\ndifferent ways of doing the same nothing. Ah, no, one way was actually\nreturning SWAP_FAIL when it meant to return SWAP_SUCCESS.\n\n[kosaki.motohiro@jp.fujitsu.com: comment adding to mlocking in try_to_unmap_one]\n[akpm@linux-foundation.org: remove test of MLOCK_PAGES]\nSigned-off-by: Hugh Dickins \u003chugh.dickins@tiscali.co.uk\u003e\nCc: Izik Eidus \u003cieidus@redhat.com\u003e\nCc: Andrea Arcangeli \u003caarcange@redhat.com\u003e\nCc: Nick Piggin \u003cnpiggin@suse.de\u003e\nCc: Rik van Riel \u003criel@redhat.com\u003e\nCc: Lee Schermerhorn \u003cLee.Schermerhorn@hp.com\u003e\nCc: Andi Kleen \u003candi@firstfloor.org\u003e\nCc: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nCc: Wu Fengguang \u003cfengguang.wu@intel.com\u003e\nCc: Minchan Kim \u003cminchan.kim@gmail.com\u003e\nSigned-off-by: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nCc: Andi Kleen \u003candi@firstfloor.org\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "3ca7b3c5b64d35fe02c35b5d44c2c58b49499fee", "tree": "bb6af24d3683788ef658282f8794af19d2232663", "parents": [ "bb3ab596832b920c703d1aea1ce76d69c0f71fb7" ], "author": { "name": "Hugh Dickins", "email": "hugh.dickins@tiscali.co.uk", "time": "Mon Dec 14 17:58:57 2009 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Dec 15 08:53:17 2009 -0800" }, "message": "mm: define PAGE_MAPPING_FLAGS\n\nAt present we define PageAnon(page) by the low PAGE_MAPPING_ANON bit set\nin page-\u003emapping, with the higher bits a pointer to the anon_vma; and have\ndefined PageKsm(page) as that with NULL anon_vma.\n\nBut KSM swapping will need to store a pointer there: so in preparation for\nthat, now define PAGE_MAPPING_FLAGS as the low two bits, including\nPAGE_MAPPING_KSM (always set along with PAGE_MAPPING_ANON, until some\nother use for the bit emerges).\n\nDeclare page_rmapping(page) to return the pointer part of page-\u003emapping,\nand page_anon_vma(page) to return the anon_vma pointer when that\u0027s what it\nis. Use these in a few appropriate places: notably, unuse_vma() has been\ntesting page-\u003emapping, but is better to be testing page_anon_vma() (cases\nmay be added in which flag bits are set without any pointer).\n\nSigned-off-by: Hugh Dickins \u003chugh.dickins@tiscali.co.uk\u003e\nCc: Izik Eidus \u003cieidus@redhat.com\u003e\nCc: Andrea Arcangeli \u003caarcange@redhat.com\u003e\nCc: Nick Piggin \u003cnpiggin@suse.de\u003e\nCc: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nReviewed-by: Rik van Riel \u003criel@redhat.com\u003e\nCc: Lee Schermerhorn \u003cLee.Schermerhorn@hp.com\u003e\nCc: Andi Kleen \u003candi@firstfloor.org\u003e\nCc: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nCc: Wu Fengguang \u003cfengguang.wu@intel.com\u003e\nCc: Minchan Kim \u003cminchan.kim@gmail.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "273f047e36d83179573dc7e3a8af6aceaa8c599e", "tree": "0202c5e27f163ceb7b33dc6bd7cddcb87a1e6a46", "parents": [ "7b51159405272157123ea8e0ef9b63c731dbfb48" ], "author": { "name": "Huang Shijie", "email": "shijie8@gmail.com", "time": "Mon Dec 14 17:58:51 2009 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Dec 15 08:53:16 2009 -0800" }, "message": "rmap: move label `out\u0027 to a better place\n\nWhen the code jumps to the `out\u0027, `referenced\u0027 is still zero. So there is\nno need to check it.\n\nSigned-off-by: Huang Shijie \u003cshijie8@gmail.com\u003e\nAcked-by: Wu Fengguang \u003cfengguang.wu@intel.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "7b51159405272157123ea8e0ef9b63c731dbfb48", "tree": "b483123483f3a3aba8b46db3150a76b5546f42c8", "parents": [ "8051be5e614f3e3feccbe9e06b50e0b889740a93" ], "author": { "name": "Huang Shijie", "email": "shijie8@gmail.com", "time": "Mon Dec 14 17:58:51 2009 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Dec 15 08:53:16 2009 -0800" }, "message": "rmap: simplify try_to_unmap_file()\n\nJust simplify the code when `mlocked\u0027 is true.\n\nSigned-off-by: Huang Shijie \u003cshijie8@gmail.com\u003e\nReviewed-by: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "8051be5e614f3e3feccbe9e06b50e0b889740a93", "tree": "7a8fc30c60b827209aa13581b3a9c1422d7632f3", "parents": [ "6aceb53be44ed55a2374c20a62e3aef9d3919e8d" ], "author": { "name": "Huang Shijie", "email": "shijie8@gmail.com", "time": "Mon Dec 14 17:58:50 2009 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Dec 15 08:53:16 2009 -0800" }, "message": "rmap: fix the comment for try_to_unmap_anon\n\nFix the comment for try_to_unmap_anon() with the new arguments.\n\nSigned-off-by: Huang Shijie \u003cshijie8@gmail.com\u003e\nAcked-by: Hugh Dickins \u003chugh.dickins@tiscali.co.uk\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "570a335b8e22579e2a51a68136d2b1f907a20eec", "tree": "c5312383e948d2e7ac60c2fa410fee98e8b38a70", "parents": [ "8d69aaee80c123b460918816cbfa2e83224c3646" ], "author": { "name": "Hugh Dickins", "email": "hugh.dickins@tiscali.co.uk", "time": "Mon Dec 14 17:58:46 2009 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Dec 15 08:53:15 2009 -0800" }, "message": "swap_info: swap count continuations\n\nSwap is duplicated (reference count incremented by one) whenever the same\nswap page is inserted into another mm (when forking finds a swap entry in\nplace of a pte, or when reclaim unmaps a pte to insert the swap entry).\n\nswap_info_struct\u0027s vmalloc\u0027ed swap_map is the array of these reference\ncounts: but what happens when the unsigned short (or unsigned char since\nthe preceding patch) is full? (and its high bit is kept for a cache flag)\n\nWe then lose track of it, never freeing, leaving it in use until swapoff:\nat which point we _hope_ that a single pass will have found all instances,\nassume there are no more, and will lose user data if we\u0027re wrong.\n\nSwapping of KSM pages has not yet been enabled; but it is implemented,\nand makes it very easy for a user to overflow the maximum swap count:\npossible with ordinary process pages, but unlikely, even when pid_max\nhas been raised from PID_MAX_DEFAULT.\n\nThis patch implements swap count continuations: when the count overflows,\na continuation page is allocated and linked to the original vmalloc\u0027ed\nmap page, and this used to hold the continuation counts for that entry\nand its neighbours. These continuation pages are seldom referenced:\nthe common paths all work on the original swap_map, only referring to\na continuation page when the low \"digit\" of a count is incremented or\ndecremented through SWAP_MAP_MAX.\n\nSigned-off-by: Hugh Dickins \u003chugh.dickins@tiscali.co.uk\u003e\nCc: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nCc: Rik van Riel \u003criel@redhat.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "bf89c8c867322338f3f2b1255f280a3236b61a69", "tree": "8a6193d4e0b86851a49ac417cd81dffb95eb925a", "parents": [ "392d814daf460a9564d29b2cebc51e1ea34e0504" ], "author": { "name": "Huang Shijie", "email": "shijie8@gmail.com", "time": "Thu Oct 01 15:44:04 2009 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Thu Oct 01 16:11:12 2009 -0700" }, "message": "mm/rmap.c: fix comment\n\nThe page_address_in_vma() is not only used in unuse_vma().\n\nSigned-off-by: Huang Shijie \u003cshijie8@gmail.com\u003e\nAcked-by: Hugh Dickins \u003chugh.dickins@tiscali.co.uk\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "db16826367fefcb0ddb93d76b66adc52eb4e6339", "tree": "626224c1eb1eb79c522714591f208b4fdbdcd9d4", "parents": [ "cd6045138ed1bb5d8773e940d51c34318eef3ef2", "465fdd97cbe16ef8727221857e96ef62dd352017" ], "author": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Thu Sep 24 07:53:22 2009 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Thu Sep 24 07:53:22 2009 -0700" }, "message": "Merge branch \u0027hwpoison\u0027 of git://git.kernel.org/pub/scm/linux/kernel/git/ak/linux-mce-2.6\n\n* \u0027hwpoison\u0027 of git://git.kernel.org/pub/scm/linux/kernel/git/ak/linux-mce-2.6: (21 commits)\n HWPOISON: Enable error_remove_page on btrfs\n HWPOISON: Add simple debugfs interface to inject hwpoison on arbitary PFNs\n HWPOISON: Add madvise() based injector for hardware poisoned pages v4\n HWPOISON: Enable error_remove_page for NFS\n HWPOISON: Enable .remove_error_page for migration aware file systems\n HWPOISON: The high level memory error handler in the VM v7\n HWPOISON: Add PR_MCE_KILL prctl to control early kill behaviour per process\n HWPOISON: shmem: call set_page_dirty() with locked page\n HWPOISON: Define a new error_remove_page address space op for async truncation\n HWPOISON: Add invalidate_inode_page\n HWPOISON: Refactor truncate to allow direct truncating of page v2\n HWPOISON: check and isolate corrupted free pages v2\n HWPOISON: Handle hardware poisoned pages in try_to_unmap\n HWPOISON: Use bitmask/action code for try_to_unmap behaviour\n HWPOISON: x86: Add VM_FAULT_HWPOISON handling to x86 page fault handler v2\n HWPOISON: Add poison check to page fault handling\n HWPOISON: Add basic support for poisoned pages in fault handler v3\n HWPOISON: Add new SIGBUS error codes for hardware poison signals\n HWPOISON: Add support for poison swap entries v2\n HWPOISON: Export some rmap vma locking to outside world\n ...\n" }, { "commit": "21333b2b66b805a360641568588e5a0bb06d9d1f", "tree": "c0ce4d31e31ae2d2b1ef975b00c0611a3099c7a3", "parents": [ "f8af4da3b4c14e7267c4ffb952079af3912c51c5" ], "author": { "name": "Hugh Dickins", "email": "hugh.dickins@tiscali.co.uk", "time": "Mon Sep 21 17:01:59 2009 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Sep 22 07:17:31 2009 -0700" }, "message": "ksm: no debug in page_dup_rmap()\n\npage_dup_rmap(), used on each mapped page when forking, was originally\njust an inline atomic_inc of mapcount. 2.6.22 added CONFIG_DEBUG_VM\nout-of-line checks to it, which would need to be ever-so-slightly\ncomplicated to allow for the PageKsm() we\u0027re about to define.\n\nBut I think these checks never caught anything. And if it\u0027s coding errors\nwe\u0027re worried about, such checks should be in page_remove_rmap() too, not\njust when forking; whereas if it\u0027s pagetable corruption we\u0027re worried\nabout, then they shouldn\u0027t be limited to CONFIG_DEBUG_VM.\n\nOh, just revert page_dup_rmap() to an inline atomic_inc of mapcount.\n\nSigned-off-by: Hugh Dickins \u003chugh.dickins@tiscali.co.uk\u003e\nSigned-off-by: Chris Wright \u003cchrisw@redhat.com\u003e\nSigned-off-by: Izik Eidus \u003cieidus@redhat.com\u003e\nCc: Nick Piggin \u003cnpiggin@suse.de\u003e\nCc: Andrea Arcangeli \u003caarcange@redhat.com\u003e\nCc: Rik van Riel \u003criel@redhat.com\u003e\nCc: Wu Fengguang \u003cfengguang.wu@intel.com\u003e\nCc: Balbir Singh \u003cbalbir@in.ibm.com\u003e\nCc: Hugh Dickins \u003chugh.dickins@tiscali.co.uk\u003e\nCc: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nCc: Lee Schermerhorn \u003clee.schermerhorn@hp.com\u003e\nCc: Avi Kivity \u003cavi@redhat.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "b904dcfed6967e9cfc8a54778498f6d289420309", "tree": "af57711bb516ad30d622223d80f01932fe51a4fe", "parents": [ "57dd28fb0513d2f772bb215f27925165e7b9ce5f" ], "author": { "name": "KOSAKI Motohiro", "email": "kosaki.motohiro@jp.fujitsu.com", "time": "Mon Sep 21 17:01:28 2009 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Sep 22 07:17:26 2009 -0700" }, "message": "mm: clean up page_remove_rmap()\n\npage_remove_rmap() has multiple PageAnon() tests and it has deep nesting.\nClean this up.\n\nSigned-off-by: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nCc: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nAcked-by: Mel Gorman \u003cmel@csn.ul.ie\u003e\nReviewed-by: Wu Fengguang \u003cfengguang.wu@intel.com\u003e\nCc: Rik van Riel \u003criel@redhat.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "6a46079cf57a7f7758e8b926980a4f852f89b34d", "tree": "efd72e830201370d6273bd436dda5a3c4cd6ed9b", "parents": [ "4db96cf077aa938b11fe7ac79ecc9b29ec00fbab" ], "author": { "name": "Andi Kleen", "email": "andi@firstfloor.org", "time": "Wed Sep 16 11:50:15 2009 +0200" }, "committer": { "name": "Andi Kleen", "email": "ak@linux.intel.com", "time": "Wed Sep 16 11:50:15 2009 +0200" }, "message": "HWPOISON: The high level memory error handler in the VM v7\n\nAdd the high level memory handler that poisons pages\nthat got corrupted by hardware (typically by a two bit flip in a DIMM\nor a cache) on the Linux level. The goal is to prevent everyone\nfrom accessing these pages in the future.\n\nThis done at the VM level by marking a page hwpoisoned\nand doing the appropriate action based on the type of page\nit is.\n\nThe code that does this is portable and lives in mm/memory-failure.c\n\nTo quote the overview comment:\n\nHigh level machine check handler. Handles pages reported by the\nhardware as being corrupted usually due to a 2bit ECC memory or cache\nfailure.\n\nThis focuses on pages detected as corrupted in the background.\nWhen the current CPU tries to consume corruption the currently\nrunning process can just be killed directly instead. This implies\nthat if the error cannot be handled for some reason it\u0027s safe to\njust ignore it because no corruption has been consumed yet. Instead\nwhen that happens another machine check will happen.\n\nHandles page cache pages in various states. The tricky part\nhere is that we can access any page asynchronous to other VM\nusers, because memory failures could happen anytime and anywhere,\npossibly violating some of their assumptions. This is why this code\nhas to be extremely careful. Generally it tries to use normal locking\nrules, as in get the standard locks, even if that means the\nerror handling takes potentially a long time.\n\nSome of the operations here are somewhat inefficient and have non\nlinear algorithmic complexity, because the data structures have not\nbeen optimized for this case. This is in particular the case\nfor the mapping from a vma to a process. Since this case is expected\nto be rare we hope we can get away with this.\n\nThere are in principle two strategies to kill processes on poison:\n- just unmap the data and wait for an actual reference before\nkilling\n- kill as soon as corruption is detected.\nBoth have advantages and disadvantages and should be used\nin different situations. Right now both are implemented and can\nbe switched with a new sysctl vm.memory_failure_early_kill\nThe default is early kill.\n\nThe patch does some rmap data structure walking on its own to collect\nprocesses to kill. This is unusual because normally all rmap data structure\nknowledge is in rmap.c only. I put it here for now to keep\neverything together and rmap knowledge has been seeping out anyways\n\nIncludes contributions from Johannes Weiner, Chris Mason, Fengguang Wu,\nNick Piggin (who did a lot of great work) and others.\n\nCc: npiggin@suse.de\nCc: riel@redhat.com\nSigned-off-by: Andi Kleen \u003cak@linux.intel.com\u003e\nAcked-by: Rik van Riel \u003criel@redhat.com\u003e\nReviewed-by: Hidehiro Kawai \u003chidehiro.kawai.ez@hitachi.com\u003e\n" }, { "commit": "888b9f7c58ebe8303bad817cd554df887a683957", "tree": "ebd01e55f5a6631a463fbb863adfbe9dcf49ad7d", "parents": [ "14fa31b89c5ae79e4131da41761378a6df674352" ], "author": { "name": "Andi Kleen", "email": "ak@linux.intel.com", "time": "Wed Sep 16 11:50:11 2009 +0200" }, "committer": { "name": "Andi Kleen", "email": "ak@linux.intel.com", "time": "Wed Sep 16 11:50:11 2009 +0200" }, "message": "HWPOISON: Handle hardware poisoned pages in try_to_unmap\n\nWhen a page has the poison bit set replace the PTE with a poison entry.\nThis causes the right error handling to be done later when a process runs\ninto it.\n\nv2: add a new flag to not do that (needed for the memory-failure handler\nlater) (Fengguang)\nv3: remove unnecessary is_migration_entry() test (Fengguang, Minchan)\n\nReviewed-by: Minchan Kim \u003cminchan.kim@gmail.com\u003e\nReviewed-by: Wu Fengguang \u003cfengguang.wu@intel.com\u003e\nSigned-off-by: Andi Kleen \u003cak@linux.intel.com\u003e\n" }, { "commit": "14fa31b89c5ae79e4131da41761378a6df674352", "tree": "c6c79e89e0aa0b2efeaf657d4715250a406ab699", "parents": [ "a6e04aa92965565968573a220a35b4e907385697" ], "author": { "name": "Andi Kleen", "email": "andi@firstfloor.org", "time": "Wed Sep 16 11:50:10 2009 +0200" }, "committer": { "name": "Andi Kleen", "email": "ak@linux.intel.com", "time": "Wed Sep 16 11:50:10 2009 +0200" }, "message": "HWPOISON: Use bitmask/action code for try_to_unmap behaviour\n\ntry_to_unmap currently has multiple modi (migration, munlock, normal unmap)\nwhich are selected by magic flag variables. The logic is not very straight\nforward, because each of these flag change multiple behaviours (e.g.\nmigration turns off aging, not only sets up migration ptes etc.)\nAlso the different flags interact in magic ways.\n\nA later patch in this series adds another mode to try_to_unmap, so\nthis becomes quickly unmanageable.\n\nReplace the different flags with a action code (migration, munlock, munmap)\nand some additional flags as modifiers (ignore mlock, ignore aging).\nThis makes the logic more straight forward and allows easier extension\nto new behaviours. Change all the caller to declare what they want to\ndo.\n\nThis patch is supposed to be a nop in behaviour. If anyone can prove\nit is not that would be a bug.\n\nCc: Lee.Schermerhorn@hp.com\nCc: npiggin@suse.de\n\nSigned-off-by: Andi Kleen \u003cak@linux.intel.com\u003e\n" }, { "commit": "10be22dfe1e6ad978269dc275147e0ed049187bb", "tree": "d00418a59d9de0aadd092559d92f0d348d87a4b1", "parents": [ "d466f2fcb32cd97fd586bfa33f5dba3ac78aadb0" ], "author": { "name": "Andi Kleen", "email": "andi@firstfloor.org", "time": "Wed Sep 16 11:50:04 2009 +0200" }, "committer": { "name": "Andi Kleen", "email": "ak@linux.intel.com", "time": "Wed Sep 16 11:50:04 2009 +0200" }, "message": "HWPOISON: Export some rmap vma locking to outside world\n\nNeeded for later patch that walks rmap entries on its own.\n\nThis used to be very frowned upon, but memory-failure.c does\nsome rather specialized rmap walking and rmap has been stable\nfor quite some time, so I think it\u0027s ok now to export it.\n\nSigned-off-by: Andi Kleen \u003cak@linux.intel.com\u003e\n" }, { "commit": "03ef83af528899aa339e42d8024b37e2f434fba4", "tree": "1a323ead874d690de79cd213d5231b4fc758979b", "parents": [ "b62e408c05228f40e69bb38a48db8961cac6cd23" ], "author": { "name": "Minchan Kim", "email": "minchan.kim@gmail.com", "time": "Wed Aug 26 14:29:23 2009 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Wed Aug 26 20:06:52 2009 -0700" }, "message": "mm: fix for infinite churning of mlocked pages\n\nAn mlocked page might lose the isolatation race. This causes the page to\nclear PG_mlocked while it remains in a VM_LOCKED vma. This means it can\nbe put onto the [in]active list. We can rescue it by using try_to_unmap()\nin shrink_page_list().\n\nBut now, As Wu Fengguang pointed out, vmscan has a bug. If the page has\nPG_referenced, it can\u0027t reach try_to_unmap() in shrink_page_list() but is\nput into the active list. If the page is referenced repeatedly, it can\nremain on the [in]active list without being moving to the unevictable\nlist.\n\nThis patch fixes it.\n\nReported-by: Wu Fengguang \u003cfengguang.wu@intel.com\u003e\nSigned-off-by: Minchan Kim \u003cminchan.kim@gmail.com\u003e\nReviewed-by: KOSAKI Motohiro \u003c\u003ckosaki.motohiro@jp.fujitsu.com\u003e\nCc: Lee Schermerhorn \u003clee.schermerhorn@hp.com\u003e\nAcked-by: Rik van Riel \u003criel@redhat.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "d69b042f3d7406ddba560143b1796020df760800", "tree": "6b704864716240aa1282d06bb79c02ef4b77e16d", "parents": [ "cd5008196f7e583f4c558531a2bca59f6c674c5b" ], "author": { "name": "Balbir Singh", "email": "balbir@linux.vnet.ibm.com", "time": "Wed Jun 17 16:26:34 2009 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Thu Jun 18 13:03:47 2009 -0700" }, "message": "memcg: add file-based RSS accounting\n\nAdd file RSS tracking per memory cgroup\n\nWe currently don\u0027t track file RSS, the RSS we report is actually anon RSS.\n All the file mapped pages, come in through the page cache and get\naccounted there. This patch adds support for accounting file RSS pages.\nIt should\n\n1. Help improve the metrics reported by the memory resource controller\n2. Will form the basis for a future shared memory accounting heuristic\n that has been proposed by Kamezawa.\n\nUnfortunately, we cannot rename the existing \"rss\" keyword used in\nmemory.stat to \"anon_rss\". We however, add \"mapped_file\" data and hope to\neducate the end user through documentation.\n\n[hugh.dickins@tiscali.co.uk: fix mem_cgroup_update_mapped_file_stat oops]\nSigned-off-by: Balbir Singh \u003cbalbir@linux.vnet.ibm.com\u003e\nAcked-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nCc: Li Zefan \u003clizf@cn.fujitsu.cn\u003e\nCc: Paul Menage \u003cmenage@google.com\u003e\nCc: Dhaval Giani \u003cdhaval@linux.vnet.ibm.com\u003e\nCc: Daisuke Nishimura \u003cnishimura@mxp.nes.nec.co.jp\u003e\nCc: YAMAMOTO Takashi \u003cyamamoto@valinux.co.jp\u003e\nCc: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nCc: David Rientjes \u003crientjes@google.com\u003e\nSigned-off-by: Hugh Dickins \u003chugh.dickins@tiscali.co.uk\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "6fe6b7e35785e3232ffe7f81d3893f1316710a02", "tree": "6f47c03735504d8aab8f7b048465b87cc5b15861", "parents": [ "608e8e66a154cbc3d591a59dcebfd9cbc9e3431a" ], "author": { "name": "Wu Fengguang", "email": "fengguang.wu@intel.com", "time": "Tue Jun 16 15:33:05 2009 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Jun 16 19:47:44 2009 -0700" }, "message": "vmscan: report vm_flags in page_referenced()\n\nCollect vma-\u003evm_flags of the VMAs that actually referenced the page.\n\nThis is preparing for more informed reclaim heuristics, eg. to protect\nexecutable file pages more aggressively. For now only the VM_EXEC bit\nwill be used by the caller.\n\nThanks to Johannes, Peter and Minchan for all the good tips.\n\nAcked-by: Peter Zijlstra \u003cpeterz@infradead.org\u003e\nReviewed-by: Rik van Riel \u003criel@redhat.com\u003e\nReviewed-by: Minchan Kim \u003cminchan.kim@gmail.com\u003e\nReviewed-by: Johannes Weiner \u003channes@cmpxchg.org\u003e\nSigned-off-by: Wu Fengguang \u003cfengguang.wu@intel.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "6837765963f1723e80ca97b1fae660f3a60d77df", "tree": "a9a6ed4b7e3bf188966da78b04bf39298f24375a", "parents": [ "bce7394a3ef82b8477952fbab838e4a6e8cb47d2" ], "author": { "name": "KOSAKI Motohiro", "email": "kosaki.motohiro@jp.fujitsu.com", "time": "Tue Jun 16 15:32:51 2009 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Jun 16 19:47:42 2009 -0700" }, "message": "mm: remove CONFIG_UNEVICTABLE_LRU config option\n\nCurrently, nobody wants to turn UNEVICTABLE_LRU off. Thus this\nconfigurability is unnecessary.\n\nSigned-off-by: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nCc: Johannes Weiner \u003channes@cmpxchg.org\u003e\nCc: Andi Kleen \u003candi@firstfloor.org\u003e\nAcked-by: Minchan Kim \u003cminchan.kim@gmail.com\u003e\nCc: David Woodhouse \u003cdwmw2@infradead.org\u003e\nCc: Matt Mackall \u003cmpm@selenic.com\u003e\nCc: Rik van Riel \u003criel@redhat.com\u003e\nCc: Lee Schermerhorn \u003clee.schermerhorn@hp.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "98f32602d42951e61a059685f842aa7d778ffab0", "tree": "283a357f417f2ddf99a783dddeac8257e9342de3", "parents": [ "ecca1c5e3a55d1581be9aa9144642c67de70e33b" ], "author": { "name": "Hugh Dickins", "email": "hugh.dickins@tiscali.co.uk", "time": "Thu May 21 20:33:58 2009 +0100" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Thu May 21 13:14:32 2009 -0700" }, "message": "hugh: update email address\n\nMy old address will shut down in a few days time: remove it from the tree,\nand add a tmpfs (shmem filesystem) maintainer entry with the new address.\n\nSigned-off-by: Hugh Dickins \u003chugh@veritas.com\u003e\nSigned-off-by: Hugh Dickins \u003chugh.dickins@tiscali.co.uk\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "508b9f8efdad123b202b228f71f59feba51e4fb5", "tree": "0da0d842edb168cfb7b883a3148b147dc631c2b9", "parents": [ "02ac597c9b86af49b2016aa98aee20ab59dbf0d2" ], "author": { "name": "MinChan Kim", "email": "minchan.kim@gmail.com", "time": "Wed Feb 11 13:04:27 2009 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Wed Feb 11 14:25:35 2009 -0800" }, "message": "mm: fix mlocked page counter mismatch\n\nWhen I tested following program, I found that the mlocked counter\nis strange. It cannot free some mlocked pages.\n\nIt is because try_to_unmap_file() doesn\u0027t check real\npage mappings in vmas.\n\nThat is because the goal of an address_space for a file is to find all\nprocesses into which the file\u0027s specific interval is mapped. It is\nrelated to the file\u0027s interval, not to pages.\n\nEven if the page isn\u0027t really mapped by the vma, it returns SWAP_MLOCK\nsince the vma has VM_LOCKED, then calls try_to_mlock_page. After this the\nmlocked counter is increased again.\n\nCOWed anon page in a file-backed vma could be a such case. This patch\nresolves it.\n\n-- my test program --\n\nint main()\n{\n mlockall(MCL_CURRENT);\n return 0;\n}\n\n-- before --\n\nroot@barrios-target-linux:~# cat /proc/meminfo | egrep \u0027Mlo|Unev\u0027\nUnevictable: 0 kB\nMlocked: 0 kB\n\n-- after --\n\nroot@barrios-target-linux:~# cat /proc/meminfo | egrep \u0027Mlo|Unev\u0027\nUnevictable: 8 kB\nMlocked: 8 kB\n\nSigned-off-by: MinChan Kim \u003cminchan.kim@gmail.com\u003e\nAcked-by: Lee Schermerhorn \u003clee.schermerhorn@hp.com\u003e\nAcked-by: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nTested-by: Lee Schermerhorn \u003clee.schermerhorn@hp.com\u003e\nCc: Hugh Dickins \u003chugh@veritas.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "edc315fd222497ae4f4b959a9e31ada1e68a4755", "tree": "aaf1a6b015368c52097ed0c362a24bf18e40897f", "parents": [ "2509ef26db4699a5d9fa876e90ddfc107afcab84" ], "author": { "name": "Hugh Dickins", "email": "hugh@veritas.com", "time": "Tue Jan 06 14:40:11 2009 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Jan 06 15:59:07 2009 -0800" }, "message": "badpage: remove vma from page_remove_rmap\n\nRemove page_remove_rmap()\u0027s vma arg, which was only for the Eeek message.\nAnd remove the BUG_ON(page_mapcount(page) \u003d\u003d 0) from CONFIG_DEBUG_VM\u0027s\npage_dup_rmap(): we\u0027re trying to be more resilient about that than BUGs.\n\nSigned-off-by: Hugh Dickins \u003chugh@veritas.com\u003e\nCc: Nick Piggin \u003cnickpiggin@yahoo.com.au\u003e\nCc: Christoph Lameter \u003ccl@linux-foundation.org\u003e\nCc: Mel Gorman \u003cmel@csn.ul.ie\u003e\nCc: Rik van Riel \u003criel@redhat.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "3dc147414ccad81dc33edb80774b1fed12a38c08", "tree": "bdcfd37fa47d6617490fa276ddfcc5a6ab0c731b", "parents": [ "8cc3b39221b0ecbd83a338948a8396df097fc656" ], "author": { "name": "Hugh Dickins", "email": "hugh@veritas.com", "time": "Tue Jan 06 14:40:08 2009 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Jan 06 15:59:07 2009 -0800" }, "message": "badpage: replace page_remove_rmap Eeek and BUG\n\nNow that bad pages are kept out of circulation, there is no need for the\ninfamous page_remove_rmap() BUG() - once that page is freed, its negative\nmapcount will issue a \"Bad page state\" message and the page won\u0027t be\nfreed. Removing the BUG() allows more info, on subsequent pages, to be\ngathered.\n\nWe do have more info about the page at this point than bad_page() can know\n- notably, what the pmd is, which might pinpoint something like low 64kB\ncorruption - but page_remove_rmap() isn\u0027t given the address to find that.\n\nIn practice, there is only one call to page_remove_rmap() which has ever\nreported anything, that from zap_pte_range() (usually on exit, sometimes\non munmap). It has all the info, so remove page_remove_rmap()\u0027s \"Eeek\"\nmessage and leave it all to zap_pte_range().\n\nmm/memory.c already has a hardly used print_bad_pte() function, showing\nsome of the appropriate info: extend it to show what we want for the rmap\ncase: pte info, page info (when there is a page) and vma info to compare.\nzap_pte_range() already knows the pmd, but print_bad_pte() is easier to\nuse if it works that out for itself.\n\nSome of this info is also shown in bad_page()\u0027s \"Bad page state\" message.\nKeep them separate, but adjust them to match each other as far as\npossible. Say \"Bad page map\" in print_bad_pte(), and add a TAINT_BAD_PAGE\nthere too.\n\nprint_bad_pte() show current-\u003ecomm unconditionally (though it should get\nrepeated in the usually irrelevant stack trace): sorry, I misled Nick\nPiggin to make it conditional on vm_mm \u003d\u003d current-\u003emm, but current-\u003emm is\nalready NULL in the exit case. Usually current-\u003ecomm is good, though\nexceptionally it may not be that of the mm (when \"swapoff\" for example).\n\nSigned-off-by: Hugh Dickins \u003chugh@veritas.com\u003e\nCc: Nick Piggin \u003cnickpiggin@yahoo.com.au\u003e\nCc: Christoph Lameter \u003ccl@linux-foundation.org\u003e\nCc: Mel Gorman \u003cmel@csn.ul.ie\u003e\nCc: Rik van Riel \u003criel@redhat.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "cbf84b7add8103b92aaa84928e335df726bfc8da", "tree": "04e3ef2b3f70e5bf647f4f4c8c3ce50dd12e8474", "parents": [ "2afd1c928f1132b8d0099866e75ce8ad713a1180" ], "author": { "name": "Hugh Dickins", "email": "hugh@veritas.com", "time": "Tue Jan 06 14:39:27 2009 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Jan 06 15:59:02 2009 -0800" }, "message": "mm: further cleanup page_add_new_anon_rmap\n\nMoving lru_cache_add_active_or_unevictable() into page_add_new_anon_rmap()\nwas good but stupid: we can and should SetPageSwapBacked() there too; and\nwe know for sure that this anonymous, swap-backed page is not file cache.\n\nSigned-off-by: Hugh Dickins \u003chugh@veritas.com\u003e\nCc: Lee Schermerhorn \u003clee.schermerhorn@hp.com\u003e\nCc: Nick Piggin \u003cnickpiggin@yahoo.com.au\u003e\nAcked-by: Rik van Riel \u003criel@redhat.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "2afd1c928f1132b8d0099866e75ce8ad713a1180", "tree": "e31d1cfd0b11df74e0241fe43e4be2c72a8946ff", "parents": [ "b5934c531849ff4a51ce0f290141efe564290e40" ], "author": { "name": "Hugh Dickins", "email": "hugh@veritas.com", "time": "Tue Jan 06 14:39:26 2009 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Jan 06 15:59:02 2009 -0800" }, "message": "mm: make page_lock_anon_vma() static\n\npage_lock_anon_vma() and page_unlock_anon_vma() were made available to\nshow_page_path() in vmscan.c; but now that has been removed, make them\nstatic in rmap.c again, they\u0027re better kept private if possible.\n\nSigned-off-by: Hugh Dickins \u003chugh@veritas.com\u003e\nReviewed-by: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "b5934c531849ff4a51ce0f290141efe564290e40", "tree": "0c741a5bd6178db11f1147875f59e7a1a9d1754d", "parents": [ "51726b1222863852c46ca21ed0115b85d1edfd89" ], "author": { "name": "Hugh Dickins", "email": "hugh@veritas.com", "time": "Tue Jan 06 14:39:25 2009 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Jan 06 15:59:02 2009 -0800" }, "message": "mm: add_active_or_unevictable into rmap\n\nlru_cache_add_active_or_unevictable() and page_add_new_anon_rmap() always\nappear together. Save some symbol table space and some jumping around by\nremoving lru_cache_add_active_or_unevictable(), folding its code into\npage_add_new_anon_rmap(): like how we add file pages to lru just after\nadding them to page cache.\n\nRemove the nearby \"TODO: is this safe?\" comments (yes, it is safe), and\nchange page_add_new_anon_rmap()\u0027s address BUG_ON to VM_BUG_ON as\noriginally intended.\n\nSigned-off-by: Hugh Dickins \u003chugh@veritas.com\u003e\nAcked-by: Rik van Riel \u003criel@redhat.com\u003e\nCc: Lee Schermerhorn \u003cLee.Schermerhorn@hp.com\u003e\nCc: Nick Piggin \u003cnickpiggin@yahoo.com.au\u003e\nCc: Mel Gorman \u003cmel@csn.ul.ie\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "4917e5d0499b5ae7b26b56fccaefddf9aec9369c", "tree": "78f55c2d3019d1811b5447cae130c0f647916a37", "parents": [ "64cdd548ffe26849d4cd113ac640f60606063b14" ], "author": { "name": "Johannes Weiner", "email": "hannes@cmpxchg.org", "time": "Tue Jan 06 14:39:17 2009 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Jan 06 15:59:00 2009 -0800" }, "message": "mm: more likely reclaim MADV_SEQUENTIAL mappings\n\nFile pages mapped only in sequentially read mappings are perfect reclaim\ncanditates.\n\nThis patch makes these mappings behave like weak references, their pages\nwill be reclaimed unless they have a strong reference from a normal\nmapping as well.\n\nIt changes the reclaim and the unmap path where they check if the page has\nbeen referenced. In both cases, accesses through sequentially read\nmappings will be ignored.\n\nBenchmark results from KOSAKI Motohiro:\n\n http://marc.info/?l\u003dlinux-mm\u0026m\u003d122485301925098\u0026w\u003d2\n\nSigned-off-by: Johannes Weiner \u003channes@saeurebad.de\u003e\nSigned-off-by: Rik van Riel \u003criel@redhat.com\u003e\nAcked-by: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nCc: Nick Piggin \u003cnpiggin@suse.de\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "64cdd548ffe26849d4cd113ac640f60606063b14", "tree": "9a7a8af9022621d2da3648757b724fcd32b20168", "parents": [ "1b0bd118862cd9fe9ac2872137a1b8107e83ff9d" ], "author": { "name": "KOSAKI Motohiro", "email": "kosaki.motohiro@jp.fujitsu.com", "time": "Tue Jan 06 14:39:16 2009 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Jan 06 15:59:00 2009 -0800" }, "message": "mm: cleanup: remove #ifdef CONFIG_MIGRATION\n\n#ifdef in *.c file decrease source readability a bit. removing is better.\n\nThis patch doesn\u0027t have any functional change.\n\nSigned-off-by: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nCc: Christoph Lameter \u003ccl@linux-foundation.org\u003e\nCc: Mel Gorman \u003cmel@csn.ul.ie\u003e\nCc: Lee Schermerhorn \u003cLee.Schermerhorn@hp.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "fdd2e5f88a259a537bb239e0c03c973cb6ea402a", "tree": "e97192ba1a7b7f341c8d3debc3fe7639b2eaa284", "parents": [ "1a651a00e20fd4997f0b91258f6f95b7d96edcd9" ], "author": { "name": "Adrian Bunk", "email": "bunk@kernel.org", "time": "Sat Oct 18 20:28:38 2008 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 20 08:52:40 2008 -0700" }, "message": "make mm/rmap.c:anon_vma_cachep static\n\nThis patch makes the needlessly global anon_vma_cachep static.\n\nSigned-off-by: Adrian Bunk \u003cbunk@kernel.org\u003e\nReviewed-by: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nAcked-by: Rik van Riel \u003criel@redhat.com\u003e\nAcked-by: Hugh Dickins \u003chugh@veritas.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "5b4e655e948d8b6e9b0d001616d4c9d7e7ffe924", "tree": "2822f944d1bdbc8414a65cd94b982c51b5032b50", "parents": [ "b7abea9630bc8ffc663a751e46680db25c4cdf8d" ], "author": { "name": "KAMEZAWA Hiroyuki", "email": "kamezawa.hiroyu@jp.fujitsu.com", "time": "Sat Oct 18 20:28:10 2008 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 20 08:52:38 2008 -0700" }, "message": "memcg: avoid accounting special pages\n\nThere are not-on-LRU pages which can be mapped and they are not worth to\nbe accounted. (becasue we can\u0027t shrink them and need dirty codes to\nhandle specical case) We\u0027d like to make use of usual objrmap/radix-tree\u0027s\nprotcol and don\u0027t want to account out-of-vm\u0027s control pages.\n\nWhen special_mapping_fault() is called, page-\u003emapping is tend to be NULL\nand it\u0027s charged as Anonymous page. insert_page() also handles some\nspecial pages from drivers.\n\nThis patch is for avoiding to account special pages.\n\nSigned-off-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nCc: Daisuke Nishimura \u003cnishimura@mxp.nes.nec.co.jp\u003e\nCc: Balbir Singh \u003cbalbir@linux.vnet.ibm.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "af936a1606246a10c145feac3770f6287f483f02", "tree": "8b1ca7fabb5c749ffdecd654519889c6c2ed2fb6", "parents": [ "64d6519dda3905dfb94d3f93c07c5f263f41813f" ], "author": { "name": "Lee Schermerhorn", "email": "lee.schermerhorn@hp.com", "time": "Sat Oct 18 20:26:53 2008 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 20 08:52:31 2008 -0700" }, "message": "vmscan: unevictable LRU scan sysctl\n\nThis patch adds a function to scan individual or all zones\u0027 unevictable\nlists and move any pages that have become evictable onto the respective\nzone\u0027s inactive list, where shrink_inactive_list() will deal with them.\n\nAdds sysctl to scan all nodes, and per node attributes to individual\nnodes\u0027 zones.\n\nKosaki: If evictable page found in unevictable lru when write\n/proc/sys/vm/scan_unevictable_pages, print filename and file offset of\nthese pages.\n\n[akpm@linux-foundation.org: fix one CONFIG_MMU\u003dn build error]\n[kosaki.motohiro@jp.fujitsu.com: adapt vmscan-unevictable-lru-scan-sysctl.patch to new sysfs API]\nSigned-off-by: Lee Schermerhorn \u003clee.schermerhorn@hp.com\u003e\nSigned-off-by: Rik van Riel \u003criel@redhat.com\u003e\nSigned-off-by: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nSigned-off-by: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nSigned-off-by: Hugh Dickins \u003chugh@veritas.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "b291f000393f5a0b679012b39d79fbc85c018233", "tree": "28eb785d4d157d3396e4377294e6054635a4bd90", "parents": [ "89e004ea55abe201b29e2d6e35124101f1288ef7" ], "author": { "name": "Nick Piggin", "email": "npiggin@suse.de", "time": "Sat Oct 18 20:26:44 2008 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 20 08:52:30 2008 -0700" }, "message": "mlock: mlocked pages are unevictable\n\nMake sure that mlocked pages also live on the unevictable LRU, so kswapd\nwill not scan them over and over again.\n\nThis is achieved through various strategies:\n\n1) add yet another page flag--PG_mlocked--to indicate that\n the page is locked for efficient testing in vmscan and,\n optionally, fault path. This allows early culling of\n unevictable pages, preventing them from getting to\n page_referenced()/try_to_unmap(). Also allows separate\n accounting of mlock\u0027d pages, as Nick\u0027s original patch\n did.\n\n Note: Nick\u0027s original mlock patch used a PG_mlocked\n flag. I had removed this in favor of the PG_unevictable\n flag + an mlock_count [new page struct member]. I\n restored the PG_mlocked flag to eliminate the new\n count field.\n\n2) add the mlock/unevictable infrastructure to mm/mlock.c,\n with internal APIs in mm/internal.h. This is a rework\n of Nick\u0027s original patch to these files, taking into\n account that mlocked pages are now kept on unevictable\n LRU list.\n\n3) update vmscan.c:page_evictable() to check PageMlocked()\n and, if vma passed in, the vm_flags. Note that the vma\n will only be passed in for new pages in the fault path;\n and then only if the \"cull unevictable pages in fault\n path\" patch is included.\n\n4) add try_to_unlock() to rmap.c to walk a page\u0027s rmap and\n ClearPageMlocked() if no other vmas have it mlocked.\n Reuses as much of try_to_unmap() as possible. This\n effectively replaces the use of one of the lru list links\n as an mlock count. If this mechanism let\u0027s pages in mlocked\n vmas leak through w/o PG_mlocked set [I don\u0027t know that it\n does], we should catch them later in try_to_unmap(). One\n hopes this will be rare, as it will be relatively expensive.\n\nOriginal mm/internal.h, mm/rmap.c and mm/mlock.c changes:\nSigned-off-by: Nick Piggin \u003cnpiggin@suse.de\u003e\n\nsplitlru: introduce __get_user_pages():\n\n New munlock processing need to GUP_FLAGS_IGNORE_VMA_PERMISSIONS.\n because current get_user_pages() can\u0027t grab PROT_NONE pages theresore it\n cause PROT_NONE pages can\u0027t munlock.\n\n[akpm@linux-foundation.org: fix this for pagemap-pass-mm-into-pagewalkers.patch]\n[akpm@linux-foundation.org: untangle patch interdependencies]\n[akpm@linux-foundation.org: fix things after out-of-order merging]\n[hugh@veritas.com: fix page-flags mess]\n[lee.schermerhorn@hp.com: fix munlock page table walk - now requires \u0027mm\u0027]\n[kosaki.motohiro@jp.fujitsu.com: build fix]\n[kosaki.motohiro@jp.fujitsu.com: fix truncate race and sevaral comments]\n[kosaki.motohiro@jp.fujitsu.com: splitlru: introduce __get_user_pages()]\nSigned-off-by: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nSigned-off-by: Rik van Riel \u003criel@redhat.com\u003e\nSigned-off-by: Lee Schermerhorn \u003clee.schermerhorn@hp.com\u003e\nCc: Nick Piggin \u003cnpiggin@suse.de\u003e\nCc: Dave Hansen \u003cdave@linux.vnet.ibm.com\u003e\nCc: Matt Mackall \u003cmpm@selenic.com\u003e\nSigned-off-by: Hugh Dickins \u003chugh@veritas.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "d9d332e0874f46b91d8ac4604b68ee42b8a7a2c6", "tree": "070023e76343c4713c352aba31faae042ad3d4a6", "parents": [ "0cfd81031a26717fe14380d18275f8e217571615" ], "author": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Sun Oct 19 10:32:20 2008 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Sun Oct 19 11:50:35 2008 -0700" }, "message": "anon_vma_prepare: properly lock even newly allocated entries\n\nThe anon_vma code is very subtle, and we end up doing optimistic lookups\nof anon_vmas under RCU in page_lock_anon_vma() with no locking. Other\nCPU\u0027s can also see the newly allocated entry immediately after we\u0027ve\nexposed it by setting \"vma-\u003eanon_vma\" to the new value.\n\nWe protect against the anon_vma being destroyed by having the SLAB\nmarked as SLAB_DESTROY_BY_RCU, so the RCU lookup can depend on the\nallocation not being destroyed - but it might still be free\u0027d and\nre-allocated here to a new vma.\n\nAs a result, we should not do the anon_vma list ops on a newly allocated\nvma without proper locking.\n\nAcked-by: Nick Piggin \u003cnpiggin@suse.de\u003e\nAcked-by: Hugh Dickins \u003chugh@veritas.com\u003e\nAcked-by: Peter Zijlstra \u003ca.p.zijlstra@chello.nl\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "479db0bf408e65baa14d2a9821abfcbc0804b847", "tree": "acdaaed567afefa36ac2fe27cfe22cfefeb50cd5", "parents": [ "2d70b68d42b5196a48ccb639e3797f097ef5bea3" ], "author": { "name": "Nick Piggin", "email": "npiggin@suse.de", "time": "Wed Aug 20 14:09:18 2008 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Wed Aug 20 15:40:32 2008 -0700" }, "message": "mm: dirty page tracking race fix\n\nThere is a race with dirty page accounting where a page may not properly\nbe accounted for.\n\nclear_page_dirty_for_io() calls page_mkclean; then TestClearPageDirty.\n\npage_mkclean walks the rmaps for that page, and for each one it cleans and\nwrite protects the pte if it was dirty. It uses page_check_address to\nfind the pte. That function has a shortcut to avoid the ptl if the pte is\nnot present. Unfortunately, the pte can be switched to not-present then\nback to present by other code while holding the page table lock -- this\nshould not be a signal for page_mkclean to ignore that pte, because it may\nbe dirty.\n\nFor example, powerpc64\u0027s set_pte_at will clear a previously present pte\nbefore setting it to the desired value. There may also be other code in\ncore mm or in arch which do similar things.\n\nThe consequence of the bug is loss of data integrity due to msync, and\nloss of dirty page accounting accuracy. XIP\u0027s __xip_unmap could easily\nalso be unreliable (depending on the exact XIP locking scheme), which can\nlead to data corruption.\n\nFix this by having an option to always take ptl to check the pte in\npage_check_address.\n\nIt\u0027s possible to retain this optimization for page_referenced and\ntry_to_unmap.\n\nSigned-off-by: Nick Piggin \u003cnpiggin@suse.de\u003e\nCc: Jared Hulbert \u003cjaredeh@gmail.com\u003e\nCc: Carsten Otte \u003ccotte@freenet.de\u003e\nCc: Hugh Dickins \u003chugh@veritas.com\u003e\nAcked-by: Peter Zijlstra \u003ca.p.zijlstra@chello.nl\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "16f8c5b2e64dec7faa5d3c7e9bdf0765e864e481", "tree": "e0b8c713b7f246ac93953904f2dd8e488f9c276e", "parents": [ "d0fd93781c49cbe127f9e7a5b402e9b167c105a6" ], "author": { "name": "Hugh Dickins", "email": "hugh@veritas.com", "time": "Wed Aug 20 14:09:04 2008 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Wed Aug 20 15:40:30 2008 -0700" }, "message": "mm: page_remove_rmap comments on PageAnon\n\nAdd a comment to s390\u0027s page_test_dirty/page_clear_dirty/page_set_dirty\ndance in page_remove_rmap(): I was wrong to think the PageSwapCache test\ncould be avoided, and would like a comment in there to remind me. And\nmention s390, to help us remember that this block is not really common.\n\nAlso move down the \"It would be tidy to reset PageAnon\" comment: it does\nnot belong to s390\u0027s block, and it would be unwise to reset PageAnon\nbefore we\u0027re done with testing it.\n\nSigned-off-by: Hugh Dickins \u003chugh@veritas.com\u003e\nAcked-by: Martin Schwidefsky \u003cschwidefsky@de.ibm.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "529ae9aaa08378cfe2a4350bded76f32cc8ff0ce", "tree": "d3ae998f9876c72a83a022805103a92111852b21", "parents": [ "e9ba9698187ddbc0c5bfcf41de0349a662d23d02" ], "author": { "name": "Nick Piggin", "email": "npiggin@suse.de", "time": "Sat Aug 02 12:01:03 2008 +0200" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Aug 04 21:31:34 2008 -0700" }, "message": "mm: rename page trylock\n\nConverting page lock to new locking bitops requires a change of page flag\noperation naming, so we might as well convert it to something nicer\n(!TestSetPageLocked_Lock \u003d\u003e trylock_page, SetPageLocked \u003d\u003e set_page_locked).\n\nThis also facilitates lockdeping of page lock.\n\nSigned-off-by: Nick Piggin \u003cnpiggin@suse.de\u003e\nAcked-by: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nAcked-by: Peter Zijlstra \u003cpeterz@infradead.org\u003e\nAcked-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nAcked-by: Benjamin Herrenschmidt \u003cbenh@kernel.crashing.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "a4b526b3ba6353cd89a38e41da48ed83b0ead16f", "tree": "362842354bdcde59feede51cbeefc9b8833aacf7", "parents": [ "934b2857cc576ae53c92a66e63fce7ddcfa74691" ], "author": { "name": "Martin Schwidefsky", "email": "schwidefsky@de.ibm.com", "time": "Fri Aug 01 16:39:12 2008 +0200" }, "committer": { "name": "Martin Schwidefsky", "email": "schwidefsky@de.ibm.com", "time": "Fri Aug 01 16:39:30 2008 +0200" }, "message": "[S390] Optimize storage key operations for anon pages\n\nFor anonymous pages without a swap cache backing the check in\npage_remove_rmap for the physical dirty bit in page_remove_rmap is\nunnecessary. The instructions that are used to check and reset the dirty\nbit are expensive. Removing the check noticably speeds up process exit.\nIn addition the clearing of the dirty bit in __SetPageUptodate is\npointless as well. With these two changes there is no storage key\noperation for an anonymous page anymore if it does not hit the swap\nspace.\n\nThe micro benchmark which repeatedly executes an empty shell script\ngets about 5% faster.\n\nSigned-off-by: Martin Schwidefsky \u003cschwidefsky@de.ibm.com\u003e\n" }, { "commit": "cddb8a5c14aa89810b40495d94d3d2a0faee6619", "tree": "d0b47b071f7d2dd1d6f9c36084aa8cfcef90d1da", "parents": [ "7906d00cd1f687268f0a3599442d113767795ae6" ], "author": { "name": "Andrea Arcangeli", "email": "andrea@qumranet.com", "time": "Mon Jul 28 15:46:29 2008 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Jul 28 16:30:21 2008 -0700" }, "message": "mmu-notifiers: core\n\nWith KVM/GFP/XPMEM there isn\u0027t just the primary CPU MMU pointing to pages.\n There are secondary MMUs (with secondary sptes and secondary tlbs) too.\nsptes in the kvm case are shadow pagetables, but when I say spte in\nmmu-notifier context, I mean \"secondary pte\". In GRU case there\u0027s no\nactual secondary pte and there\u0027s only a secondary tlb because the GRU\nsecondary MMU has no knowledge about sptes and every secondary tlb miss\nevent in the MMU always generates a page fault that has to be resolved by\nthe CPU (this is not the case of KVM where the a secondary tlb miss will\nwalk sptes in hardware and it will refill the secondary tlb transparently\nto software if the corresponding spte is present). The same way\nzap_page_range has to invalidate the pte before freeing the page, the spte\n(and secondary tlb) must also be invalidated before any page is freed and\nreused.\n\nCurrently we take a page_count pin on every page mapped by sptes, but that\nmeans the pages can\u0027t be swapped whenever they\u0027re mapped by any spte\nbecause they\u0027re part of the guest working set. Furthermore a spte unmap\nevent can immediately lead to a page to be freed when the pin is released\n(so requiring the same complex and relatively slow tlb_gather smp safe\nlogic we have in zap_page_range and that can be avoided completely if the\nspte unmap event doesn\u0027t require an unpin of the page previously mapped in\nthe secondary MMU).\n\nThe mmu notifiers allow kvm/GRU/XPMEM to attach to the tsk-\u003emm and know\nwhen the VM is swapping or freeing or doing anything on the primary MMU so\nthat the secondary MMU code can drop sptes before the pages are freed,\navoiding all page pinning and allowing 100% reliable swapping of guest\nphysical address space. Furthermore it avoids the code that teardown the\nmappings of the secondary MMU, to implement a logic like tlb_gather in\nzap_page_range that would require many IPI to flush other cpu tlbs, for\neach fixed number of spte unmapped.\n\nTo make an example: if what happens on the primary MMU is a protection\ndowngrade (from writeable to wrprotect) the secondary MMU mappings will be\ninvalidated, and the next secondary-mmu-page-fault will call\nget_user_pages and trigger a do_wp_page through get_user_pages if it\ncalled get_user_pages with write\u003d1, and it\u0027ll re-establishing an updated\nspte or secondary-tlb-mapping on the copied page. Or it will setup a\nreadonly spte or readonly tlb mapping if it\u0027s a guest-read, if it calls\nget_user_pages with write\u003d0. This is just an example.\n\nThis allows to map any page pointed by any pte (and in turn visible in the\nprimary CPU MMU), into a secondary MMU (be it a pure tlb like GRU, or an\nfull MMU with both sptes and secondary-tlb like the shadow-pagetable layer\nwith kvm), or a remote DMA in software like XPMEM (hence needing of\nschedule in XPMEM code to send the invalidate to the remote node, while no\nneed to schedule in kvm/gru as it\u0027s an immediate event like invalidating\nprimary-mmu pte).\n\nAt least for KVM without this patch it\u0027s impossible to swap guests\nreliably. And having this feature and removing the page pin allows\nseveral other optimizations that simplify life considerably.\n\nDependencies:\n\n1) mm_take_all_locks() to register the mmu notifier when the whole VM\n isn\u0027t doing anything with \"mm\". This allows mmu notifier users to keep\n track if the VM is in the middle of the invalidate_range_begin/end\n critical section with an atomic counter incraese in range_begin and\n decreased in range_end. No secondary MMU page fault is allowed to map\n any spte or secondary tlb reference, while the VM is in the middle of\n range_begin/end as any page returned by get_user_pages in that critical\n section could later immediately be freed without any further\n -\u003einvalidate_page notification (invalidate_range_begin/end works on\n ranges and -\u003einvalidate_page isn\u0027t called immediately before freeing\n the page). To stop all page freeing and pagetable overwrites the\n mmap_sem must be taken in write mode and all other anon_vma/i_mmap\n locks must be taken too.\n\n2) It\u0027d be a waste to add branches in the VM if nobody could possibly\n run KVM/GRU/XPMEM on the kernel, so mmu notifiers will only enabled if\n CONFIG_KVM\u003dm/y. In the current kernel kvm won\u0027t yet take advantage of\n mmu notifiers, but this already allows to compile a KVM external module\n against a kernel with mmu notifiers enabled and from the next pull from\n kvm.git we\u0027ll start using them. And GRU/XPMEM will also be able to\n continue the development by enabling KVM\u003dm in their config, until they\n submit all GRU/XPMEM GPLv2 code to the mainline kernel. Then they can\n also enable MMU_NOTIFIERS in the same way KVM does it (even if KVM\u003dn).\n This guarantees nobody selects MMU_NOTIFIER\u003dy if KVM and GRU and XPMEM\n are all \u003dn.\n\nThe mmu_notifier_register call can fail because mm_take_all_locks may be\ninterrupted by a signal and return -EINTR. Because mmu_notifier_reigster\nis used when a driver startup, a failure can be gracefully handled. Here\nan example of the change applied to kvm to register the mmu notifiers.\nUsually when a driver startups other allocations are required anyway and\n-ENOMEM failure paths exists already.\n\n struct kvm *kvm_arch_create_vm(void)\n {\n struct kvm *kvm \u003d kzalloc(sizeof(struct kvm), GFP_KERNEL);\n+ int err;\n\n if (!kvm)\n return ERR_PTR(-ENOMEM);\n\n INIT_LIST_HEAD(\u0026kvm-\u003earch.active_mmu_pages);\n\n+ kvm-\u003earch.mmu_notifier.ops \u003d \u0026kvm_mmu_notifier_ops;\n+ err \u003d mmu_notifier_register(\u0026kvm-\u003earch.mmu_notifier, current-\u003emm);\n+ if (err) {\n+ kfree(kvm);\n+ return ERR_PTR(err);\n+ }\n+\n return kvm;\n }\n\nmmu_notifier_unregister returns void and it\u0027s reliable.\n\nThe patch also adds a few needed but missing includes that would prevent\nkernel to compile after these changes on non-x86 archs (x86 didn\u0027t need\nthem by luck).\n\n[akpm@linux-foundation.org: coding-style fixes]\n[akpm@linux-foundation.org: fix mm/filemap_xip.c build]\n[akpm@linux-foundation.org: fix mm/mmu_notifier.c build]\nSigned-off-by: Andrea Arcangeli \u003candrea@qumranet.com\u003e\nSigned-off-by: Nick Piggin \u003cnpiggin@suse.de\u003e\nSigned-off-by: Christoph Lameter \u003ccl@linux-foundation.org\u003e\nCc: Jack Steiner \u003csteiner@sgi.com\u003e\nCc: Robin Holt \u003cholt@sgi.com\u003e\nCc: Nick Piggin \u003cnpiggin@suse.de\u003e\nCc: Peter Zijlstra \u003ca.p.zijlstra@chello.nl\u003e\nCc: Kanoj Sarcar \u003ckanojsarcar@yahoo.com\u003e\nCc: Roland Dreier \u003crdreier@cisco.com\u003e\nCc: Steve Wise \u003cswise@opengridcomputing.com\u003e\nCc: Avi Kivity \u003cavi@qumranet.com\u003e\nCc: Hugh Dickins \u003chugh@veritas.com\u003e\nCc: Rusty Russell \u003crusty@rustcorp.com.au\u003e\nCc: Anthony Liguori \u003caliguori@us.ibm.com\u003e\nCc: Chris Wright \u003cchrisw@redhat.com\u003e\nCc: Marcelo Tosatti \u003cmarcelo@kvack.org\u003e\nCc: Eric Dumazet \u003cdada1@cosmosbay.com\u003e\nCc: \"Paul E. McKenney\" \u003cpaulmck@us.ibm.com\u003e\nCc: Izik Eidus \u003cizike@qumranet.com\u003e\nCc: Anthony Liguori \u003caliguori@us.ibm.com\u003e\nCc: Rik van Riel \u003criel@redhat.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "51cc50685a4275c6a02653670af9f108a64e01cf", "tree": "819d47bd2b0c8a9d1835d863853804b0a0242b97", "parents": [ "d91958815d214ea365b98cbff6215383897edcb6" ], "author": { "name": "Alexey Dobriyan", "email": "adobriyan@gmail.com", "time": "Fri Jul 25 19:45:34 2008 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Sat Jul 26 12:00:07 2008 -0700" }, "message": "SL*B: drop kmem cache argument from constructor\n\nKmem cache passed to constructor is only needed for constructors that are\nthemselves multiplexeres. Nobody uses this \"feature\", nor does anybody uses\npassed kmem cache in non-trivial way, so pass only pointer to object.\n\nNon-trivial places are:\n\tarch/powerpc/mm/init_64.c\n\tarch/powerpc/mm/hugetlbpage.c\n\nThis is flag day, yes.\n\nSigned-off-by: Alexey Dobriyan \u003cadobriyan@gmail.com\u003e\nAcked-by: Pekka Enberg \u003cpenberg@cs.helsinki.fi\u003e\nAcked-by: Christoph Lameter \u003ccl@linux-foundation.org\u003e\nCc: Jon Tollefson \u003ckniht@linux.vnet.ibm.com\u003e\nCc: Nick Piggin \u003cnickpiggin@yahoo.com.au\u003e\nCc: Matt Mackall \u003cmpm@selenic.com\u003e\n[akpm@linux-foundation.org: fix arch/powerpc/mm/hugetlbpage.c]\n[akpm@linux-foundation.org: fix mm/slab.c]\n[akpm@linux-foundation.org: fix ubifs]\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "69029cd550284e32de13d6dd2f77b723c8a0e444", "tree": "b57b87e5025b6c01722f39302cb98d0dfcd58940", "parents": [ "e8589cc189f96b87348ae83ea4db38eaac624135" ], "author": { "name": "KAMEZAWA Hiroyuki", "email": "kamezawa.hiroyu@jp.fujitsu.com", "time": "Fri Jul 25 01:47:14 2008 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Fri Jul 25 10:53:37 2008 -0700" }, "message": "memcg: remove refcnt from page_cgroup\n\nmemcg: performance improvements\n\nPatch Description\n 1/5 ... remove refcnt fron page_cgroup patch (shmem handling is fixed)\n 2/5 ... swapcache handling patch\n 3/5 ... add helper function for shmem\u0027s memory reclaim patch\n 4/5 ... optimize by likely/unlikely ppatch\n 5/5 ... remove redundunt check patch (shmem handling is fixed.)\n\nUnix bench result.\n\n\u003d\u003d 2.6.26-rc2-mm1 + memory resource controller\nExecl Throughput 2915.4 lps (29.6 secs, 3 samples)\nC Compiler Throughput 1019.3 lpm (60.0 secs, 3 samples)\nShell Scripts (1 concurrent) 5796.0 lpm (60.0 secs, 3 samples)\nShell Scripts (8 concurrent) 1097.7 lpm (60.0 secs, 3 samples)\nShell Scripts (16 concurrent) 565.3 lpm (60.0 secs, 3 samples)\nFile Read 1024 bufsize 2000 maxblocks 1022128.0 KBps (30.0 secs, 3 samples)\nFile Write 1024 bufsize 2000 maxblocks 544057.0 KBps (30.0 secs, 3 samples)\nFile Copy 1024 bufsize 2000 maxblocks 346481.0 KBps (30.0 secs, 3 samples)\nFile Read 256 bufsize 500 maxblocks 319325.0 KBps (30.0 secs, 3 samples)\nFile Write 256 bufsize 500 maxblocks 148788.0 KBps (30.0 secs, 3 samples)\nFile Copy 256 bufsize 500 maxblocks 99051.0 KBps (30.0 secs, 3 samples)\nFile Read 4096 bufsize 8000 maxblocks 2058917.0 KBps (30.0 secs, 3 samples)\nFile Write 4096 bufsize 8000 maxblocks 1606109.0 KBps (30.0 secs, 3 samples)\nFile Copy 4096 bufsize 8000 maxblocks 854789.0 KBps (30.0 secs, 3 samples)\nDc: sqrt(2) to 99 decimal places 126145.2 lpm (30.0 secs, 3 samples)\n\n INDEX VALUES\nTEST BASELINE RESULT INDEX\n\nExecl Throughput 43.0 2915.4 678.0\nFile Copy 1024 bufsize 2000 maxblocks 3960.0 346481.0 875.0\nFile Copy 256 bufsize 500 maxblocks 1655.0 99051.0 598.5\nFile Copy 4096 bufsize 8000 maxblocks 5800.0 854789.0 1473.8\nShell Scripts (8 concurrent) 6.0 1097.7 1829.5\n \u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\n FINAL SCORE 991.3\n\n\u003d\u003d 2.6.26-rc2-mm1 + this set \u003d\u003d\nExecl Throughput 3012.9 lps (29.9 secs, 3 samples)\nC Compiler Throughput 981.0 lpm (60.0 secs, 3 samples)\nShell Scripts (1 concurrent) 5872.0 lpm (60.0 secs, 3 samples)\nShell Scripts (8 concurrent) 1120.3 lpm (60.0 secs, 3 samples)\nShell Scripts (16 concurrent) 578.0 lpm (60.0 secs, 3 samples)\nFile Read 1024 bufsize 2000 maxblocks 1003993.0 KBps (30.0 secs, 3 samples)\nFile Write 1024 bufsize 2000 maxblocks 550452.0 KBps (30.0 secs, 3 samples)\nFile Copy 1024 bufsize 2000 maxblocks 347159.0 KBps (30.0 secs, 3 samples)\nFile Read 256 bufsize 500 maxblocks 314644.0 KBps (30.0 secs, 3 samples)\nFile Write 256 bufsize 500 maxblocks 151852.0 KBps (30.0 secs, 3 samples)\nFile Copy 256 bufsize 500 maxblocks 101000.0 KBps (30.0 secs, 3 samples)\nFile Read 4096 bufsize 8000 maxblocks 2033256.0 KBps (30.0 secs, 3 samples)\nFile Write 4096 bufsize 8000 maxblocks 1611814.0 KBps (30.0 secs, 3 samples)\nFile Copy 4096 bufsize 8000 maxblocks 847979.0 KBps (30.0 secs, 3 samples)\nDc: sqrt(2) to 99 decimal places 128148.7 lpm (30.0 secs, 3 samples)\n\n INDEX VALUES\nTEST BASELINE RESULT INDEX\n\nExecl Throughput 43.0 3012.9 700.7\nFile Copy 1024 bufsize 2000 maxblocks 3960.0 347159.0 876.7\nFile Copy 256 bufsize 500 maxblocks 1655.0 101000.0 610.3\nFile Copy 4096 bufsize 8000 maxblocks 5800.0 847979.0 1462.0\nShell Scripts (8 concurrent) 6.0 1120.3 1867.2\n \u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\n FINAL SCORE 1004.6\n\nThis patch:\n\nRemove refcnt from page_cgroup().\n\nAfter this,\n\n * A page is charged only when !page_mapped() \u0026\u0026 no page_cgroup is assigned.\n\t* Anon page is newly mapped.\n\t* File page is added to mapping-\u003etree.\n\n * A page is uncharged only when\n\t* Anon page is fully unmapped.\n\t* File page is removed from LRU.\n\nThere is no change in behavior from user\u0027s view.\n\nThis patch also removes unnecessary calls in rmap.c which was used only for\nrefcnt mangement.\n\n[akpm@linux-foundation.org: fix warning]\n[hugh@veritas.com: fix shmem_unuse_inode charging]\nSigned-off-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nCc: Balbir Singh \u003cbalbir@in.ibm.com\u003e\nCc: \"Eric W. Biederman\" \u003cebiederm@xmission.com\u003e\nCc: Pavel Emelyanov \u003cxemul@openvz.org\u003e\nCc: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nCc: Hugh Dickins \u003chugh@veritas.com\u003e\nCc: YAMAMOTO Takashi \u003cyamamoto@valinux.co.jp\u003e\nCc: Paul Menage \u003cmenage@google.com\u003e\nCc: David Rientjes \u003crientjes@google.com\u003e\nSigned-off-by: Hugh Dickins \u003chugh@veritas.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "3c18ddd160d1fcd46d1131d9ad6c594dd8e9af99", "tree": "7307ba1ae4bdb99d1363eb59b1ebefcf5295c8ef", "parents": [ "4d3d5b41a72b52555d43efbfc4ccde6ba6e5444f" ], "author": { "name": "Nick Piggin", "email": "npiggin@suse.de", "time": "Mon Apr 28 02:12:10 2008 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Apr 28 08:58:18 2008 -0700" }, "message": "mm: remove nopage\n\nNothing in the tree uses nopage any more. Remove support for it in the\ncore mm code and documentation (and a few stray references to it in\ncomments).\n\nSigned-off-by: Nick Piggin \u003cnpiggin@suse.de\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "5b7baf05783b1ac97a510243d7e82293416a7cf6", "tree": "15b753206d9a3fd5edd0029405f8acfc69237861", "parents": [ "402b08622d9ac6e32e25289573272e0f21bb58a7" ], "author": { "name": "Christian Borntraeger", "email": "borntraeger@de.ibm.com", "time": "Tue Mar 25 18:47:12 2008 +0100" }, "committer": { "name": "Avi Kivity", "email": "avi@qumranet.com", "time": "Sun Apr 27 12:00:40 2008 +0300" }, "message": "s390: KVM preparation: host memory management changes for s390 kvm\n\nThis patch changes the s390 memory management defintions to use the pgste field\nfor dirty and reference bit tracking of host and guest code. Usually on s390,\ndirty and referenced are tracked in storage keys, which belong to the physical\npage. This changes with virtualization: The guest and host dirty/reference bits\nare defined to be the logical OR of the values for the mapping and the physical\npage. This patch implements the necessary changes in pgtable.h for s390.\n\nThere is a common code change in mm/rmap.c, the call to\npage_test_and_clear_young must be moved. This is a no-op for all\narchitecture but s390. page_referenced checks the referenced bits for\nthe physiscal page and for all mappings:\no The physical page is checked with page_test_and_clear_young.\no The mappings are checked with ptep_test_and_clear_young and friends.\n\nWithout pgstes (the current implementation on Linux s390) the physical page\ncheck is implemented but the mapping callbacks are no-ops because dirty\nand referenced are not tracked in the s390 page tables. The pgstes introduces\nguest and host dirty and reference bits for s390 in the host mapping. These\nmapping must be checked before page_test_and_clear_young resets the reference\nbit.\n\nSigned-off-by: Heiko Carstens \u003cheiko.carstens@de.ibm.com\u003e\nSigned-off-by: Christian Borntraeger \u003cborntraeger@de.ibm.com\u003e\nAcked-by: Martin Schwidefsky \u003cschwidefsky@de.ibm.com\u003e\nAcked-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Carsten Otte \u003ccotte@de.ibm.com\u003e\nSigned-off-by: Avi Kivity \u003cavi@qumranet.com\u003e\n" }, { "commit": "43d8eac44f28d384d2377dcdd1407f51f79dda55", "tree": "65496ae1834a29989a1baf9ebdacec175d315dcd", "parents": [ "77f6078aa8945a18a7780694940e52be0322c2b8" ], "author": { "name": "Randy Dunlap", "email": "randy.dunlap@oracle.com", "time": "Wed Mar 19 17:00:43 2008 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Wed Mar 19 18:53:35 2008 -0700" }, "message": "mm: rmap kernel-doc fixes\n\nCorrect kernel-doc function names and parameters in rmap.c.\n\nSigned-off-by: Randy Dunlap \u003crandy.dunlap@oracle.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "bd845e38c7a7251a95a8f2c38aa7fb87140b771d", "tree": "007a1a6703f4fe27d52a07e6caea8ce87d06ff77", "parents": [ "acc4988bcf38f9618886eaeb9802aeacc6978ec2" ], "author": { "name": "Hugh Dickins", "email": "hugh@veritas.com", "time": "Tue Mar 04 14:29:01 2008 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@woody.linux-foundation.org", "time": "Tue Mar 04 16:35:14 2008 -0800" }, "message": "memcg: mm_match_cgroup not vm_match_cgroup\n\nvm_match_cgroup is a perverse name for a macro to match mm with cgroup: rename\nit mm_match_cgroup, matching mm_init_cgroup and mm_free_cgroup.\n\nSigned-off-by: Hugh Dickins \u003chugh@veritas.com\u003e\nAcked-by: David Rientjes \u003crientjes@google.com\u003e\nAcked-by: Balbir Singh \u003cbalbir@linux.vnet.ibm.com\u003e\nAcked-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nCc: Hirokazu Takahashi \u003ctaka@valinux.co.jp\u003e\nCc: YAMAMOTO Takashi \u003cyamamoto@valinux.co.jp\u003e\nCc: Paul Menage \u003cmenage@google.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "60c12b1202a60eabb1c61317e5d2678fcea9893f", "tree": "143e5bdbd10d32832fce9183500deebad6c6e4db", "parents": [ "6966a97753854c8b5336cf3997d5d1d205d91b12" ], "author": { "name": "David Rientjes", "email": "rientjes@google.com", "time": "Sat Feb 09 00:10:15 2008 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@woody.linux-foundation.org", "time": "Sat Feb 09 11:08:33 2008 -0800" }, "message": "memcontrol: add vm_match_cgroup()\n\nmm_cgroup() is exclusively used to test whether an mm\u0027s mem_cgroup pointer\nis pointing to a specific cgroup. Instead of returning the pointer, we can\njust do the test itself in a new macro:\n\n\tvm_match_cgroup(mm, cgroup)\n\nreturns non-zero if the mm\u0027s mem_cgroup points to cgroup. Otherwise it\nreturns zero.\n\nSigned-off-by: David Rientjes \u003crientjes@google.com\u003e\nCc: Balbir Singh \u003cbalbir@in.ibm.com\u003e\nCc: Adrian Bunk \u003cbunk@stusta.de\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "bed7161a519a2faef53e1bce1b47595e297c1d14", "tree": "fbc0541340465f7d83221b829a9382cac2855916", "parents": [ "8697d33194faae6fdd6b2e799f6308aa00cfdf67" ], "author": { "name": "Balbir Singh", "email": "balbir@linux.vnet.ibm.com", "time": "Thu Feb 07 00:14:01 2008 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@woody.linux-foundation.org", "time": "Thu Feb 07 08:42:19 2008 -0800" }, "message": "Memory controller: make page_referenced() cgroup aware\n\nMake page_referenced() cgroup aware. Without this patch, page_referenced()\ncan cause a page to be skipped while reclaiming pages. This patch ensures\nthat other cgroups do not hold pages in a particular cgroup hostage. It\nis required to ensure that shared pages are freed from a cgroup when they\nare not actively referenced from the cgroup that brought them in\n\nSigned-off-by: Balbir Singh \u003cbalbir@linux.vnet.ibm.com\u003e\nCc: Pavel Emelianov \u003cxemul@openvz.org\u003e\nCc: Paul Menage \u003cmenage@google.com\u003e\nCc: Peter Zijlstra \u003ca.p.zijlstra@chello.nl\u003e\nCc: \"Eric W. Biederman\" \u003cebiederm@xmission.com\u003e\nCc: Nick Piggin \u003cnickpiggin@yahoo.com.au\u003e\nCc: Kirill Korotaev \u003cdev@sw.ru\u003e\nCc: Herbert Poetzl \u003cherbert@13thfloor.at\u003e\nCc: David Rientjes \u003crientjes@google.com\u003e\nCc: Vaidyanathan Srinivasan \u003csvaidy@linux.vnet.ibm.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "8a9f3ccd24741b50200c3f33d62534c7271f3dfc", "tree": "066aabd8d2952299501f067a91cbfd6f47ee62f6", "parents": [ "78fb74669e80883323391090e4d26d17fe29488f" ], "author": { "name": "Balbir Singh", "email": "balbir@linux.vnet.ibm.com", "time": "Thu Feb 07 00:13:53 2008 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@woody.linux-foundation.org", "time": "Thu Feb 07 08:42:18 2008 -0800" }, "message": "Memory controller: memory accounting\n\nAdd the accounting hooks. The accounting is carried out for RSS and Page\nCache (unmapped) pages. There is now a common limit and accounting for both.\nThe RSS accounting is accounted at page_add_*_rmap() and page_remove_rmap()\ntime. Page cache is accounted at add_to_page_cache(),\n__delete_from_page_cache(). Swap cache is also accounted for.\n\nEach page\u0027s page_cgroup is protected with the last bit of the\npage_cgroup pointer, this makes handling of race conditions involving\nsimultaneous mappings of a page easier. A reference count is kept in the\npage_cgroup to deal with cases where a page might be unmapped from the RSS\nof all tasks, but still lives in the page cache.\n\nCredits go to Vaidyanathan Srinivasan for helping with reference counting work\nof the page cgroup. Almost all of the page cache accounting code has help\nfrom Vaidyanathan Srinivasan.\n\n[hugh@veritas.com: fix swapoff breakage]\n[akpm@linux-foundation.org: fix locking]\nSigned-off-by: Vaidyanathan Srinivasan \u003csvaidy@linux.vnet.ibm.com\u003e\nSigned-off-by: Balbir Singh \u003cbalbir@linux.vnet.ibm.com\u003e\nCc: Pavel Emelianov \u003cxemul@openvz.org\u003e\nCc: Paul Menage \u003cmenage@google.com\u003e\nCc: Peter Zijlstra \u003ca.p.zijlstra@chello.nl\u003e\nCc: \"Eric W. Biederman\" \u003cebiederm@xmission.com\u003e\nCc: Nick Piggin \u003cnickpiggin@yahoo.com.au\u003e\nCc: Kirill Korotaev \u003cdev@sw.ru\u003e\nCc: Herbert Poetzl \u003cherbert@13thfloor.at\u003e\nCc: David Rientjes \u003crientjes@google.com\u003e\nCc: \u003cValdis.Kletnieks@vt.edu\u003e\nSigned-off-by: Hugh Dickins \u003chugh@veritas.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "5a9bbdcd29adbb786c53eba1dfc3c2d256020d6b", "tree": "44fbcff2ad653d7a328bab3144d63da9aaea6f7a", "parents": [ "9eccf2a816ed0aad82b577de6a40cd098ad41944" ], "author": { "name": "Hugh Dickins", "email": "hugh@veritas.com", "time": "Mon Feb 04 22:29:23 2008 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@woody.linux-foundation.org", "time": "Tue Feb 05 09:44:18 2008 -0800" }, "message": "mm: don\u0027t waste swap on locked pages\n\ntry_to_unmap always fails on a page found in a VM_LOCKED vma (unless\nmigrating), and recycles it back to the active list. But if it\u0027s an\nanonymous page, we\u0027ve already allocated swap to it: just wasting swap.\nSpot locked pages in page_referenced_one and treat them as referenced.\n\nSigned-off-by: Hugh Dickins \u003chugh@veritas.com\u003e\nTested-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nCc: Ethan Solomita \u003csolo@google.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "e2848a0efedef4dad52d1334d37f8719cd6268fd", "tree": "f5d2b600b1275793e7c490f34ae9ec902af138b5", "parents": [ "e31d9eb5c17ae3b80f9e9403f8a5eaf6dba879c9" ], "author": { "name": "Nick Piggin", "email": "npiggin@suse.de", "time": "Mon Feb 04 22:29:10 2008 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@woody.linux-foundation.org", "time": "Tue Feb 05 09:44:17 2008 -0800" }, "message": "radix-tree: avoid atomic allocations for preloaded insertions\n\nMost pagecache (and some other) radix tree insertions have the great\nopportunity to preallocate a few nodes with relaxed gfp flags. But the\npreallocation is squandered when it comes time to allocate a node, we\ndefault to first attempting a GFP_ATOMIC allocation -- that doesn\u0027t\nnormally fail, but it can eat into atomic memory reserves that we don\u0027t\nneed to be using.\n\nAnother upshot of this is that it removes the sometimes highly contended\nzone-\u003elock from underneath tree_lock. Pagecache insertions are always\nperformed with a radix tree preload, and after this change, such a\nsituation will never fall back to kmem_cache_alloc within\nradix_tree_node_alloc.\n\nDavid Miller reports seeing this allocation fail on a highly threaded\nsparc64 system:\n\n[527319.459981] dd: page allocation failure. order:0, mode:0x20\n[527319.460403] Call Trace:\n[527319.460568] [00000000004b71e0] __slab_alloc+0x1b0/0x6a8\n[527319.460636] [00000000004b7bbc] kmem_cache_alloc+0x4c/0xa8\n[527319.460698] [000000000055309c] radix_tree_node_alloc+0x20/0x90\n[527319.460763] [0000000000553238] radix_tree_insert+0x12c/0x260\n[527319.460830] [0000000000495cd0] add_to_page_cache+0x38/0xb0\n[527319.460893] [00000000004e4794] mpage_readpages+0x6c/0x134\n[527319.460955] [000000000049c7fc] __do_page_cache_readahead+0x170/0x280\n[527319.461028] [000000000049cc88] ondemand_readahead+0x208/0x214\n[527319.461094] [0000000000496018] do_generic_mapping_read+0xe8/0x428\n[527319.461152] [0000000000497948] generic_file_aio_read+0x108/0x170\n[527319.461217] [00000000004badac] do_sync_read+0x88/0xd0\n[527319.461292] [00000000004bb5cc] vfs_read+0x78/0x10c\n[527319.461361] [00000000004bb920] sys_read+0x34/0x60\n[527319.461424] [0000000000406294] linux_sparc_syscall32+0x3c/0x40\n\nThe calltrace is significant: __do_page_cache_readahead allocates a number\nof pages with GFP_KERNEL, and hence it should have reclaimed sufficient\nmemory to satisfy GFP_ATOMIC allocations. However after the list of pages\ngoes to mpage_readpages, there can be significant intervals (including disk\nIO) before all the pages are inserted into the radix-tree. So the reserves\ncan easily be depleted at that point. The patch is confirmed to fix the\nproblem.\n\nSigned-off-by: Nick Piggin \u003cnpiggin@suse.de\u003e\nCc: \"David S. Miller\" \u003cdavem@davemloft.net\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "ce7e9fae8db07af4080e868f4588f8f095f803dc", "tree": "000a6cc755ee35ef3cfc0795c13ed500dc5457de", "parents": [ "b8e7a54cd06b0b0174029ef3a7f5a1415a2c28f2" ], "author": { "name": "Christian Borntraeger", "email": "borntraeger@de.ibm.com", "time": "Tue Nov 20 11:13:36 2007 +0100" }, "committer": { "name": "Martin Schwidefsky", "email": "schwidefsky@de.ibm.com", "time": "Tue Nov 20 11:13:46 2007 +0100" }, "message": "[S390] Optimize storage key handling for anonymous pages\n\npage_mkclean used to call page_clear_dirty for every given page. This\nis different to all other architectures, where the dirty bit in the\nPTEs is only resetted, if page_mapping() returns a non-NULL pointer.\nWe can move the page_test_dirty/page_clear_dirty sequence into the\n2nd if to avoid unnecessary iske/sske sequences, which are expensive.\n\nThis change also helps kvm for s390 as the host must transfer the\ndirty bit into the guest status bits. By moving the page_clear_dirty\noperation into the 2nd if, the vm will only call page_clear_dirty\nfor pages where it walks the mapping anyway. There it calls\nptep_clear_flush for writable ptes, so we can transfer the dirty bit\nto the guest.\n\nSigned-off-by: Christian Borntraeger \u003cborntraeger@de.ibm.com\u003e\nSigned-off-by: Martin Schwidefsky \u003cschwidefsky@de.ibm.com\u003e\n" }, { "commit": "3ad33b2436b545cbe8b28e53f3710432cad457ab", "tree": "581808f90a08838ee27d76cc24812c7093c216a9", "parents": [ "e1a1c997afe907e6ec4799e4be0f38cffd8b418c" ], "author": { "name": "Lee Schermerhorn", "email": "Lee.Schermerhorn@hp.com", "time": "Wed Nov 14 16:59:10 2007 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@woody.linux-foundation.org", "time": "Wed Nov 14 18:45:38 2007 -0800" }, "message": "Migration: find correct vma in new_vma_page()\n\nWe hit the BUG_ON() in mm/rmap.c:vma_address() when trying to migrate via\nmbind(MPOL_MF_MOVE) a non-anon region that spans multiple vmas. For\nanon-regions, we just fail to migrate any pages beyond the 1st vma in the\nrange.\n\nThis occurs because do_mbind() collects a list of pages to migrate by\ncalling check_range(). check_range() walks the task\u0027s mm, spanning vmas as\nnecessary, to collect the migratable pages into a list. Then, do_mbind()\ncalls migrate_pages() passing the list of pages, a function to allocate new\npages based on vma policy [new_vma_page()], and a pointer to the first vma\nof the range.\n\nFor each page in the list, new_vma_page() calls page_address_in_vma()\npassing the page and the vma [first in range] to obtain the address to get\nfor alloc_page_vma(). The page address is needed to get interleaving\npolicy correct. If the pages in the list come from multiple vmas,\neventually, new_page_address() will pass that page to page_address_in_vma()\nwith the incorrect vma. For !PageAnon pages, this will result in a bug\ncheck in rmap.c:vma_address(). For anon pages, vma_address() will just\nreturn EFAULT and fail the migration.\n\nThis patch modifies new_vma_page() to check the return value from\npage_address_in_vma(). If the return value is EFAULT, new_vma_page()\nsearchs forward via vm_next for the vma that maps the page--i.e., that does\nnot return EFAULT. This assumes that the pages in the list handed to\nmigrate_pages() is in address order. This is currently case. The patch\ndocuments this assumption in a new comment block for new_vma_page().\n\nIf new_vma_page() cannot locate the vma mapping the page in a forward\nsearch in the mm, it will pass a NULL vma to alloc_page_vma(). This will\nresult in the allocation using the task policy, if any, else system default\npolicy. This situation is unlikely, but the patch documents this behavior\nwith a comment.\n\nNote, this patch results in restarting from the first vma in a multi-vma\nrange each time new_vma_page() is called. If this is not acceptable, we\ncan make the vma argument a pointer, both in new_vma_page() and it\u0027s caller\nunmap_and_move() so that the value held by the loop in migrate_pages()\nalways passes down the last vma in which a page was found. This will\nrequire changes to all new_page_t functions passed to migrate_pages(). Is\nthis necessary?\n\nFor this patch to work, we can\u0027t bug check in vma_address() for pages\noutside the argument vma. This patch removes the BUG_ON(). All other\ncallers [besides new_vma_page()] already check the return status.\n\nTested on x86_64, 4 node NUMA platform.\n\nSigned-off-by: Lee Schermerhorn \u003clee.schermerhorn@hp.com\u003e\nAcked-by: Christoph Lameter \u003cclameter@sgi.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "7a4050791b23c55a451974027d41d72a9b78039b", "tree": "f3956a04f24a2406276804124853535a59c0cbc1", "parents": [ "d773ed6b856a96bd6d18b6e04455e3ced0876da4" ], "author": { "name": "Nick Piggin", "email": "npiggin@suse.de", "time": "Tue Oct 16 23:26:02 2007 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@woody.linux-foundation.org", "time": "Wed Oct 17 08:42:46 2007 -0700" }, "message": "mm: document tree_lock-\u003ezone.lock lockorder\n\nzone-\u003elock is quite an \"inner\" lock and mostly constrained to page alloc as\nwell, so like slab locks, it probably isn\u0027t something that is critically\nimportant to document here. However unlike slab locks, zone lock could be\nused more widely in future, and page_alloc.c might possibly have more\nbusiness to do tricky things with pagecache than does slab. So... I don\u0027t\nthink it hurts to document it.\n\nSigned-off-by: Nick Piggin \u003cnpiggin@suse.de\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "4ba9b9d0ba0a49d91fa6417c7510ee36f48cf957", "tree": "191b4f45f926e44b882b1e87a9a85dc12230b892", "parents": [ "b811c202a0edadaac7242ab834fe7ba409978ae7" ], "author": { "name": "Christoph Lameter", "email": "clameter@sgi.com", "time": "Tue Oct 16 23:25:51 2007 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@woody.linux-foundation.org", "time": "Wed Oct 17 08:42:45 2007 -0700" }, "message": "Slab API: remove useless ctor parameter and reorder parameters\n\nSlab constructors currently have a flags parameter that is never used. And\nthe order of the arguments is opposite to other slab functions. The object\npointer is placed before the kmem_cache pointer.\n\nConvert\n\n ctor(void *object, struct kmem_cache *s, unsigned long flags)\n\nto\n\n ctor(struct kmem_cache *s, void *object)\n\nthroughout the kernel\n\n[akpm@linux-foundation.org: coupla fixes]\nSigned-off-by: Christoph Lameter \u003cclameter@sgi.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "954ffcb35f5aca428661d29b96c4eee82b3c19cd", "tree": "2dd8aaf26a8ae81b461b6d5d824ae8744690e483", "parents": [ "97ee052461446526e1de7236497e6f1b1ffedf8c" ], "author": { "name": "KAMEZAWA Hiroyuki", "email": "kamezawa.hiroyu@jp.fujitsu.com", "time": "Tue Oct 16 01:25:44 2007 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@woody.linux-foundation.org", "time": "Tue Oct 16 09:42:59 2007 -0700" }, "message": "flush icache before set_pte() on ia64: flush icache at set_pte\n\nCurrent ia64 kernel flushes icache by lazy_mmu_prot_update() *after*\nset_pte(). This is too late. This patch removes lazy_mmu_prot_update and\nadd modfied set_pte() for flushing if necessary.\n\nThis patch flush icache of a page when\n\tnew pte has exec bit.\n\t\u0026\u0026 new pte has present bit\n\t\u0026\u0026 new pte is user\u0027s page.\n\t\u0026\u0026 (old *ptep is not present\n || new pte\u0027s pfn is not same to old *ptep\u0027s ptn)\n\t\u0026\u0026 new pte\u0027s page has no Pg_arch_1 bit.\n\t Pg_arch_1 is set when a page is cache consistent.\n\nI think this condition checks are much easier to understand than considering\n\"Where sync_icache_dcache() should be inserted ?\".\n\npte_user() for ia64 was removed by http://lkml.org/lkml/2007/6/12/67 as\nclean-up. So, I added it again.\n\nSigned-off-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nCc: \"Luck, Tony\" \u003ctony.luck@intel.com\u003e\nCc: Christoph Lameter \u003cclameter@sgi.com\u003e\nCc: Hugh Dickins \u003chugh@veritas.com\u003e\nCc: Nick Piggin \u003cnickpiggin@yahoo.com.au\u003e\nAcked-by: David S. Miller \u003cdavem@davemloft.net\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "20c2df83d25c6a95affe6157a4c9cac4cf5ffaac", "tree": "415c4453d2b17a50abe7a3e515177e1fa337bd67", "parents": [ "64fb98fc40738ae1a98bcea9ca3145b89fb71524" ], "author": { "name": "Paul Mundt", "email": "lethal@linux-sh.org", "time": "Fri Jul 20 10:11:58 2007 +0900" }, "committer": { "name": "Paul Mundt", "email": "lethal@linux-sh.org", "time": "Fri Jul 20 10:11:58 2007 +0900" }, "message": "mm: Remove slab destructors from kmem_cache_create().\n\nSlab destructors were no longer supported after Christoph\u0027s\nc59def9f222d44bb7e2f0a559f2906191a0862d7 change. They\u0027ve been\nBUGs for both slab and slub, and slob never supported them\neither.\n\nThis rips out support for the dtor pointer from kmem_cache_create()\ncompletely and fixes up every single callsite in the kernel (there were\nabout 224, not including the slab allocator definitions themselves,\nor the documentation references).\n\nSigned-off-by: Paul Mundt \u003clethal@linux-sh.org\u003e\n" }, { "commit": "54cb8821de07f2ffcd28c380ce9b93d5784b40d7", "tree": "1de676534963d96af42863b20191bc9f80060dea", "parents": [ "d00806b183152af6d24f46f0c33f14162ca1262a" ], "author": { "name": "Nick Piggin", "email": "npiggin@suse.de", "time": "Thu Jul 19 01:46:59 2007 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@woody.linux-foundation.org", "time": "Thu Jul 19 10:04:41 2007 -0700" }, "message": "mm: merge populate and nopage into fault (fixes nonlinear)\n\nNonlinear mappings are (AFAIKS) simply a virtual memory concept that encodes\nthe virtual address -\u003e file offset differently from linear mappings.\n\n-\u003epopulate is a layering violation because the filesystem/pagecache code\nshould need to know anything about the virtual memory mapping. The hitch here\nis that the -\u003enopage handler didn\u0027t pass down enough information (ie. pgoff).\n But it is more logical to pass pgoff rather than have the -\u003enopage function\ncalculate it itself anyway (because that\u0027s a similar layering violation).\n\nHaving the populate handler install the pte itself is likewise a nasty thing\nto be doing.\n\nThis patch introduces a new fault handler that replaces -\u003enopage and\n-\u003epopulate and (later) -\u003enopfn. Most of the old mechanism is still in place\nso there is a lot of duplication and nice cleanups that can be removed if\neveryone switches over.\n\nThe rationale for doing this in the first place is that nonlinear mappings are\nsubject to the pagefault vs invalidate/truncate race too, and it seemed stupid\nto duplicate the synchronisation logic rather than just consolidate the two.\n\nAfter this patch, MAP_NONBLOCK no longer sets up ptes for pages present in\npagecache. Seems like a fringe functionality anyway.\n\nNOPAGE_REFAULT is removed. This should be implemented with -\u003efault, and no\nusers have hit mainline yet.\n\n[akpm@linux-foundation.org: cleanup]\n[randy.dunlap@oracle.com: doc. fixes for readahead]\n[akpm@linux-foundation.org: build fix]\nSigned-off-by: Nick Piggin \u003cnpiggin@suse.de\u003e\nSigned-off-by: Randy Dunlap \u003crandy.dunlap@oracle.com\u003e\nCc: Mark Fasheh \u003cmark.fasheh@oracle.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "30acbabae38793c9c9acace4de5b1c1889570768", "tree": "c9c1741f04382803475c113865deed065e1ca0cf", "parents": [ "172d0496cd22c98ee2e4238821fa309c01685f3a" ], "author": { "name": "Hugh Dickins", "email": "hugh@veritas.com", "time": "Wed Jun 27 14:09:53 2007 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@woody.linux-foundation.org", "time": "Thu Jun 28 11:34:53 2007 -0700" }, "message": "mm: kill validate_anon_vma to avoid mapcount BUG\n\nvalidate_anon_vma gave a useful check on the integrity of the anon_vma list\nwhen Andrea was developing obj rmap; but it was not enabled in SLES9\nitself, nor in mainline, until Nick changed commented-out RMAP_DEBUG to\nconfigurable CONFIG_DEBUG_VM in 2.6.17. Now Petr Vandrovec reports that\nits BUG_ON(mapcount \u003e 100000) can easily crash a CONFIG_DEBUG_VM\u003dy system.\n\nThat limit was just an arbitrary number to protect against an infinite\nloop. We could raise it to something enormous (depending on sizeof struct\nvma and size of memory?); but I rather think validate_anon_vma has outlived\nits usefulness, and is better just removed - which gives a magnificent\nperformance boost to anything like Petr\u0027s test program ;)\n\nOf course, a very long anon_vma list is bad news for preemption latency,\nand I believe there has been one recent report of such: let\u0027s not forget\nthat, but validate_anon_vma only makes it worse not better.\n\nSigned-off-by: Hugh Dickins \u003chugh@veritas.com\u003e\nCc: Petr Vandrovec \u003cpetr@vmware.com\u003e\nAcked-by: Nick Piggin \u003cnpiggin@suse.de\u003e\nCc: Andrea Arcangeli \u003candrea@suse.de\u003e\nCc: \u003cstable@kernel.org\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "c97a9e10eaee328e6eea9f76acf7bacd7d48ef56", "tree": "f14bf796d087e130452a2e2457c75eb1eca27483", "parents": [ "ea125892a17f43919c726777ed1e4929d41e7984" ], "author": { "name": "Nick Piggin", "email": "npiggin@suse.de", "time": "Wed May 16 22:11:21 2007 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@woody.linux-foundation.org", "time": "Thu May 17 05:23:06 2007 -0700" }, "message": "mm: more rmap checking\n\nRe-introduce rmap verification patches that Hugh removed when he removed\nPG_map_lock. PG_map_lock actually isn\u0027t needed to synchronise access to\nanonymous pages, because PG_locked and PTL together already do.\n\nThese checks were important in discovering and fixing a rare rmap corruption\nin SLES9.\n\nSigned-off-by: Nick Piggin \u003cnpiggin@suse.de\u003e\nCc: Hugh Dickins \u003chugh@veritas.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "a35afb830f8d71ec211531aeb9a621b09a2efb39", "tree": "198280081e1f8b2f6c450742a5075cc7904a3d58", "parents": [ "5577bd8a85c8b7643a241789b14fafa9c8a6c7db" ], "author": { "name": "Christoph Lameter", "email": "clameter@sgi.com", "time": "Wed May 16 22:10:57 2007 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@woody.linux-foundation.org", "time": "Thu May 17 05:23:04 2007 -0700" }, "message": "Remove SLAB_CTOR_CONSTRUCTOR\n\nSLAB_CTOR_CONSTRUCTOR is always specified. No point in checking it.\n\nSigned-off-by: Christoph Lameter \u003cclameter@sgi.com\u003e\nCc: David Howells \u003cdhowells@redhat.com\u003e\nCc: Jens Axboe \u003cjens.axboe@oracle.com\u003e\nCc: Steven French \u003csfrench@us.ibm.com\u003e\nCc: Michael Halcrow \u003cmhalcrow@us.ibm.com\u003e\nCc: OGAWA Hirofumi \u003chirofumi@mail.parknet.co.jp\u003e\nCc: Miklos Szeredi \u003cmiklos@szeredi.hu\u003e\nCc: Steven Whitehouse \u003cswhiteho@redhat.com\u003e\nCc: Roman Zippel \u003czippel@linux-m68k.org\u003e\nCc: David Woodhouse \u003cdwmw2@infradead.org\u003e\nCc: Dave Kleikamp \u003cshaggy@austin.ibm.com\u003e\nCc: Trond Myklebust \u003ctrond.myklebust@fys.uio.no\u003e\nCc: \"J. Bruce Fields\" \u003cbfields@fieldses.org\u003e\nCc: Anton Altaparmakov \u003caia21@cantab.net\u003e\nCc: Mark Fasheh \u003cmark.fasheh@oracle.com\u003e\nCc: Paul Mackerras \u003cpaulus@samba.org\u003e\nCc: Christoph Hellwig \u003chch@lst.de\u003e\nCc: Jan Kara \u003cjack@ucw.cz\u003e\nCc: David Chinner \u003cdgc@sgi.com\u003e\nCc: \"David S. Miller\" \u003cdavem@davemloft.net\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "60b59beafba875aef6d378078bce0baf2287ae14", "tree": "bb599c0e2ad43ee8f515a9f9af009442931b6a37", "parents": [ "3a2842480bbef42c3c90e14c1f378360d8c20a0c" ], "author": { "name": "Jaya Kumar", "email": "jayakumar.lkml@gmail.com", "time": "Tue May 08 00:37:37 2007 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@woody.linux-foundation.org", "time": "Tue May 08 11:15:26 2007 -0700" }, "message": "fbdev: mm: Deferred IO support\n\nThis implements deferred IO support in fbdev. Deferred IO is a way to delay\nand repurpose IO. This implementation is done using mm\u0027s page_mkwrite and\npage_mkclean hooks in order to detect, delay and then rewrite IO. This\nfunctionality is used by hecubafb.\n\n[adaplas]\nThis is useful for graphics hardware with no directly addressable/mappable\nframebuffer. Implementing this will allow the \"framebuffer\" to be accesible\nfrom user space via mmap().\n\nSigned-off-by: Jaya Kumar \u003cjayakumar.lkml@gmail.com\u003e\nSigned-off-by: Antonino Daplas \u003cadaplas@gmail.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "50953fe9e00ebbeffa032a565ab2f08312d51a87", "tree": "9f95f56f0b51600959a76cd88ce17f6e9c7a98a3", "parents": [ "4b1d89290b62bb2db476c94c82cf7442aab440c8" ], "author": { "name": "Christoph Lameter", "email": "clameter@sgi.com", "time": "Sun May 06 14:50:16 2007 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@woody.linux-foundation.org", "time": "Mon May 07 12:12:57 2007 -0700" }, "message": "slab allocators: Remove SLAB_DEBUG_INITIAL flag\n\nI have never seen a use of SLAB_DEBUG_INITIAL. It is only supported by\nSLAB.\n\nI think its purpose was to have a callback after an object has been freed\nto verify that the state is the constructor state again? The callback is\nperformed before each freeing of an object.\n\nI would think that it is much easier to check the object state manually\nbefore the free. That also places the check near the code object\nmanipulation of the object.\n\nAlso the SLAB_DEBUG_INITIAL callback is only performed if the kernel was\ncompiled with SLAB debugging on. If there would be code in a constructor\nhandling SLAB_DEBUG_INITIAL then it would have to be conditional on\nSLAB_DEBUG otherwise it would just be dead code. But there is no such code\nin the kernel. I think SLUB_DEBUG_INITIAL is too problematic to make real\nuse of, difficult to understand and there are easier ways to accomplish the\nsame effect (i.e. add debug code before kfree).\n\nThere is a related flag SLAB_CTOR_VERIFY that is frequently checked to be\nclear in fs inode caches. Remove the pointless checks (they would even be\npointless without removeal of SLAB_DEBUG_INITIAL) from the fs constructors.\n\nThis is the last slab flag that SLUB did not support. Remove the check for\nunimplemented flags from SLUB.\n\nSigned-off-by: Christoph Lameter \u003cclameter@sgi.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "6c210482ae4a9a5bb9377ad250feaacec3faa3cd", "tree": "2eb89d89a22380298d64edad59010c1d0a59e5a4", "parents": [ "2fc2d1e9ffcde78af7ab63ed640d9a4901797de2" ], "author": { "name": "Martin Schwidefsky", "email": "schwidefsky@de.ibm.com", "time": "Fri Apr 27 16:01:57 2007 +0200" }, "committer": { "name": "Martin Schwidefsky", "email": "schwidefsky@de.ibm.com", "time": "Fri Apr 27 16:01:46 2007 +0200" }, "message": "[S390] split page_test_and_clear_dirty.\n\nThe page_test_and_clear_dirty primitive really consists of two\noperations, page_test_dirty and the page_clear_dirty. The combination\nof the two is not an atomic operation, so it makes more sense to have\ntwo separate operations instead of one.\nIn addition to the improved readability of the s390 version of\nSetPageUptodate, it now avoids the page_test_dirty operation which is\nan insert-storage-key-extended (iske) instruction which is an expensive\noperation.\n\nSigned-off-by: Martin Schwidefsky \u003cschwidefsky@de.ibm.com\u003e\n" }, { "commit": "6e1beb3c22496f6e1f1feba8ae74da16f131684c", "tree": "0dd54d2da33a783bbc070ba379693acf502cfca2", "parents": [ "348e3fd19487534d9d4dd70c3ad0b751afd35792" ], "author": { "name": "Martin Schwidefsky", "email": "schwidefsky@de.ibm.com", "time": "Wed Apr 04 14:37:10 2007 +0200" }, "committer": { "name": "Martin Schwidefsky", "email": "schwidefsky@de.ibm.com", "time": "Wed Apr 04 14:37:39 2007 +0200" }, "message": "[S390] page_mkclean data corruption.\n\nThe git commit c2fda5fed81eea077363b285b66eafce20dfd45a which\nadded the page_test_and_clear_dirty call to page_mkclean and the\ngit commit 7658cc289288b8ae7dd2c2224549a048431222b3 which fixes\nthe \"nasty and subtle race in shared mmap\u0027ed page writeback\"\nproblem in clear_page_dirty_for_io cause data corruption on s390.\n\nThe effect of the two changes is that for every call to\nclear_page_dirty_for_io a page_test_and_clear_dirty is done. If\nthe per page dirty bit is set set_page_dirty is called. Strangly\nclear_page_dirty_for_io is called for not-uptodate pages, e.g.\nover this call-chain:\n\n [\u003c000000000007c0f2\u003e] clear_page_dirty_for_io+0x12a/0x130\n [\u003c000000000007c494\u003e] generic_writepages+0x258/0x3e0\n [\u003c000000000007c692\u003e] do_writepages+0x76/0x7c\n [\u003c00000000000c7a26\u003e] __writeback_single_inode+0xba/0x3e4\n [\u003c00000000000c831a\u003e] sync_sb_inodes+0x23e/0x398\n [\u003c00000000000c8802\u003e] writeback_inodes+0x12e/0x140\n [\u003c000000000007b9ee\u003e] wb_kupdate+0xd2/0x178\n [\u003c000000000007cca2\u003e] pdflush+0x162/0x23c\n\nThe bad news now is that page_test_and_clear_dirty might claim\nthat a not-uptodate page is dirty since SetPageUptodate which\nresets the per page dirty bit has not yet been called. The page\nwriteback that follows clobbers the data on disk.\n\nThe simplest solution to this problem is to move the call to\npage_test_and_clear_dirty under the \"if (page_mapped(page))\".\nIf a file backed page is mapped it is uptodate.\n\nSigned-off-by: Martin Schwidefsky \u003cschwidefsky@de.ibm.com\u003e\n" }, { "commit": "34bbd704051c9d053d69e90569a3a2365f4c7b50", "tree": "f5fb6f3941cd09be0fb92ae80f9759ad64fca709", "parents": [ "48dba8ab9b93c3b6b57946bd45ae013402b0b054" ], "author": { "name": "Oleg Nesterov", "email": "oleg@tv-sign.ru", "time": "Wed Feb 28 20:13:49 2007 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@woody.linux-foundation.org", "time": "Thu Mar 01 14:53:39 2007 -0800" }, "message": "[PATCH] adapt page_lock_anon_vma() to PREEMPT_RCU\n\npage_lock_anon_vma() uses spin_lock() to block RCU. This doesn\u0027t work with\nPREEMPT_RCU, we have to do rcu_read_lock() explicitely. Otherwise, it is\ntheoretically possible that slab returns anon_vma\u0027s memory to the system\nbefore we do spin_unlock(\u0026anon_vma-\u003elock).\n\n[ Hugh points out that this only matters for PREEMPT_RCU, which isn\u0027t merged\n yet, and may never be. Regardless, this patch is conceptually the\n right thing to do, even if it doesn\u0027t matter at this point. - Linus ]\n\nSigned-off-by: Oleg Nesterov \u003coleg@tv-sign.ru\u003e\nCc: Paul McKenney \u003cpaulmck@linux.vnet.ibm.com\u003e\nCc: Nick Piggin \u003cnickpiggin@yahoo.com.au\u003e\nCc: Christoph Lameter \u003cclameter@engr.sgi.com\u003e\nAcked-by: Hugh Dickins \u003chugh@veritas.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "d6e88e671ac12888df2d533dd4ddef705431a32a", "tree": "741d6491104adba00e4d45fe14081b175de947b7", "parents": [ "0f5486ecf7d510595c2af630aae31ed5846bdbeb" ], "author": { "name": "Al Viro", "email": "viro@ftp.linux.org.uk", "time": "Fri Dec 29 16:48:35 2006 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@woody.osdl.org", "time": "Sat Dec 30 10:56:42 2006 -0800" }, "message": "[PATCH] page_mkclean_one(): fix call to set_pte_at()\n\n(akpm: macros are wonderful)\n\nSigned-off-by: Al Viro \u003cviro@zeniv.linux.org.uk\u003e\nSigned-off-by: Andrew Morton \u003cakpm@osdl.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@osdl.org\u003e\n" }, { "commit": "c2fda5fed81eea077363b285b66eafce20dfd45a", "tree": "db4c7cdc8492df706a26eaeb050b8a788168fd32", "parents": [ "e21654a756177bf209d7a3cbe971f16104555f75" ], "author": { "name": "Peter Zijlstra", "email": "a.p.zijlstra@chello.nl", "time": "Fri Dec 22 14:25:52 2006 +0100" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@woody.osdl.org", "time": "Fri Dec 22 10:39:35 2006 -0800" }, "message": "[PATCH] Fix up page_mkclean_one(): virtual caches, s390\n\n - add flush_cache_page() for all those virtual indexed cache\n architectures.\n\n - handle s390.\n\nSigned-off-by: Peter Zijlstra \u003ca.p.zijlstra@chello.nl\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@osdl.org\u003e\n" }, { "commit": "7de6b8057976584e5a422574cae4dd21c677b4d4", "tree": "900bc533401715eec4e44b73e388a74f08b3f1a5", "parents": [ "19900cdee29c812857ce938ab449e1053d516252" ], "author": { "name": "Nick Piggin", "email": "nickpiggin@yahoo.com.au", "time": "Fri Dec 22 01:09:33 2006 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@woody.osdl.org", "time": "Fri Dec 22 08:55:49 2006 -0800" }, "message": "[PATCH] mm: more rmap debugging\n\nAdd more debugging in the rmap code in an attempt to locate to source of\nthe occasional \"mapcount went negative\" assertions.\n\nCc: Hugh Dickins \u003chugh@veritas.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@osdl.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@osdl.org\u003e\n" }, { "commit": "82591e6ea234762eeaa8b2337fe060ed438c18dc", "tree": "ea521388e91bdf385de546dada0925316eee02e3", "parents": [ "b95936cb9267e4c90a0b92361609ef5fd85a0a5f" ], "author": { "name": "Nick Piggin", "email": "npiggin@suse.de", "time": "Thu Oct 19 23:29:10 2006 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@g5.osdl.org", "time": "Fri Oct 20 10:26:44 2006 -0700" }, "message": "[PATCH] mm: more commenting on lock ordering\n\nClarify lockorder comments now that sys_msync dropps mmap_sem before\ncalling do_fsync.\n\nSigned-off-by: Nick Piggin \u003cnpiggin@suse.de\u003e\nSigned-off-by: Hugh Dickins \u003chugh@veritas.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@osdl.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@osdl.org\u003e\n" }, { "commit": "b16bc64d1aed40fb9cff9187061005b2a89b5d5d", "tree": "f6892377e9be2dcf1270f1158a1c325052b3b5c9", "parents": [ "469340236a7c9673df3e6a2425f559517f01464e" ], "author": { "name": "Dave Jones", "email": "davej@redhat.com", "time": "Wed Oct 11 01:21:27 2006 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@g5.osdl.org", "time": "Wed Oct 11 11:14:19 2006 -0700" }, "message": "[PATCH] move rmap BUG_ON outside DEBUG_VM\n\nWe have a persistent dribble of reports of this BUG triggering. Its extended\ndiagnostics were recently made conditional on CONFIG_DEBUG_VM, which was a bad\nidea - we want to know about it.\n\nSigned-off-by: Dave Jones \u003cdavej@redhat.com\u003e\nCc: Nick Piggin \u003cnickpiggin@yahoo.com.au\u003e\nCc: Hugh Dickins \u003chugh@veritas.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@osdl.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@osdl.org\u003e\n" } ], "next": "d08b3851da41d0ee60851f2c75b118e1f7a5fc89" }