)]}' { "log": [ { "commit": "50de1dd967d4ba3b8a90ebe7a4f5feca24191317", "tree": "ed2aa4352ae3c2887a90ef6279588a7048397d1b", "parents": [ "17295c88a160c6eea3fcf46cec9d08a0fcb02db9" ], "author": { "name": "Daisuke Nishimura", "email": "nishimura@mxp.nes.nec.co.jp", "time": "Thu Jan 13 15:47:43 2011 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Thu Jan 13 17:32:51 2011 -0800" }, "message": "memcg: fix memory migration of shmem swapcache\n\nIn the current implementation mem_cgroup_end_migration() decides whether\nthe page migration has succeeded or not by checking \"oldpage-\u003emapping\".\n\nBut if we are tring to migrate a shmem swapcache, the page-\u003emapping of it\nis NULL from the begining, so the check would be invalid. As a result,\nmem_cgroup_end_migration() assumes the migration has succeeded even if\nit\u0027s not, so \"newpage\" would be freed while it\u0027s not uncharged.\n\nThis patch fixes it by passing mem_cgroup_end_migration() the result of\nthe page migration.\n\nSigned-off-by: Daisuke Nishimura \u003cnishimura@mxp.nes.nec.co.jp\u003e\nReviewed-by: Minchan Kim \u003cminchan.kim@gmail.com\u003e\nAcked-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nAcked-by: Balbir Singh \u003cbalbir@linux.vnet.ibm.com\u003e\nCc: Minchan Kim \u003cminchan.kim@gmail.com\u003e\nReviewed-by: Johannes Weiner \u003channes@cmpxchg.org\u003e\nCc: Hugh Dickins \u003chughd@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": "fd4a4663db293bfd5dc20fb4113977f62895e550", "tree": "a161c087d714042b5402b858b9a6ee75392ecab2", "parents": [ "1ce82b69e96c838d007f316b8347b911fdfa9842" ], "author": { "name": "Hugh Dickins", "email": "hughd@google.com", "time": "Thu Jan 13 15:47:31 2011 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Thu Jan 13 17:32:49 2011 -0800" }, "message": "mm: fix hugepage migration\n\n2.6.37 added an unmap_and_move_huge_page() for memory failure recovery,\nbut its anon_vma handling was still based around the 2.6.35 conventions.\nUpdate it to use page_lock_anon_vma, get_anon_vma, page_unlock_anon_vma,\ndrop_anon_vma in the same way as we\u0027re now changing unmap_and_move().\n\nI don\u0027t particularly like to propose this for stable when I\u0027ve not seen\nits problems in practice nor tested the solution: but it\u0027s clearly out of\nsynch at present.\n\nSigned-off-by: Hugh Dickins \u003chughd@google.com\u003e\nCc: Mel Gorman \u003cmel@csn.ul.ie\u003e\nCc: Rik van Riel \u003criel@redhat.com\u003e\nCc: Naoya Horiguchi \u003cn-horiguchi@ah.jp.nec.com\u003e\nCc: \"Jun\u0027ichi Nomura\" \u003cj-nomura@ce.jp.nec.com\u003e\nCc: Andi Kleen \u003cak@linux.intel.com\u003e\nCc: \u003cstable@kernel.org\u003e [2.6.37, 2.6.36]\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "1ce82b69e96c838d007f316b8347b911fdfa9842", "tree": "be34e7c88a2544e620638834c8120b14b277d64a", "parents": [ "2919bfd0758257c469abef8c26c3e516bbebb851" ], "author": { "name": "Hugh Dickins", "email": "hughd@google.com", "time": "Thu Jan 13 15:47:30 2011 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Thu Jan 13 17:32:49 2011 -0800" }, "message": "mm: fix migration hangs on anon_vma lock\n\nIncreased usage of page migration in mmotm reveals that the anon_vma\nlocking in unmap_and_move() has been deficient since 2.6.36 (or even\nearlier). Review at the time of f18194275c39835cb84563500995e0d503a32d9a\n(\"mm: fix hang on anon_vma-\u003eroot-\u003elock\") missed the issue here: the\nanon_vma to which we get a reference may already have been freed back to\nits slab (it is in use when we check page_mapped, but that can change),\nand so its anon_vma-\u003eroot may be switched at any moment by reuse in\nanon_vma_prepare.\n\nPerhaps we could fix that with a get_anon_vma_unless_zero(), but let\u0027s\nnot: just rely on page_lock_anon_vma() to do all the hard thinking for us,\nthen we don\u0027t need any rcu read locking over here.\n\nIn removing the rcu_unlock label: since PageAnon is a bit in\npage-\u003emapping, it\u0027s impossible for a !page-\u003emapping page to be anon; but\ninsert VM_BUG_ON in case the implementation ever changes.\n\n[akpm@linux-foundation.org: coding-style fixes]\nSigned-off-by: Hugh Dickins \u003chughd@google.com\u003e\nReviewed-by: Mel Gorman \u003cmel@csn.ul.ie\u003e\nReviewed-by: Rik van Riel \u003criel@redhat.com\u003e\nCc: Naoya Horiguchi \u003cn-horiguchi@ah.jp.nec.com\u003e\nCc: \"Jun\u0027ichi Nomura\" \u003cj-nomura@ce.jp.nec.com\u003e\nCc: Andi Kleen \u003cak@linux.intel.com\u003e\nCc: \u003cstable@kernel.org\u003e [2.6.37, 2.6.36]\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "29c1f677d424e8c5683a837fc4f03fc9f19201d7", "tree": "97f257ab279cc000e02a1a58fa0869fb405f26cd", "parents": [ "22e5c47ee238abe636655c3862ed28d6eb084ad4" ], "author": { "name": "Mel Gorman", "email": "mel@csn.ul.ie", "time": "Thu Jan 13 15:47:21 2011 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Thu Jan 13 17:32:48 2011 -0800" }, "message": "mm: migration: use rcu_dereference_protected when dereferencing the radix tree slot during file page migration\n\nmigrate_pages() -\u003e unmap_and_move() only calls rcu_read_lock() for\nanonymous pages, as introduced by git commit\n989f89c57e6361e7d16fbd9572b5da7d313b073d (\"fix rcu_read_lock() in page\nmigraton\"). The point of the RCU protection there is part of getting a\nstable reference to anon_vma and is only held for anon pages as file pages\nare locked which is sufficient protection against freeing.\n\nHowever, while a file page\u0027s mapping is being migrated, the radix tree is\ndouble checked to ensure it is the expected page. This uses\nradix_tree_deref_slot() -\u003e rcu_dereference() without the RCU lock held\ntriggering the following warning.\n\n[ 173.674290] \u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\u003d\n[ 173.676016] [ INFO: suspicious rcu_dereference_check() usage. ]\n[ 173.676016] ---------------------------------------------------\n[ 173.676016] include/linux/radix-tree.h:145 invoked rcu_dereference_check() without protection!\n[ 173.676016]\n[ 173.676016] other info that might help us debug this:\n[ 173.676016]\n[ 173.676016]\n[ 173.676016] rcu_scheduler_active \u003d 1, debug_locks \u003d 0\n[ 173.676016] 1 lock held by hugeadm/2899:\n[ 173.676016] #0: (\u0026(\u0026inode-\u003ei_data.tree_lock)-\u003erlock){..-.-.}, at: [\u003cc10e3d2b\u003e] migrate_page_move_mapping+0x40/0x1ab\n[ 173.676016]\n[ 173.676016] stack backtrace:\n[ 173.676016] Pid: 2899, comm: hugeadm Not tainted 2.6.37-rc5-autobuild\n[ 173.676016] Call Trace:\n[ 173.676016] [\u003cc128cc01\u003e] ? printk+0x14/0x1b\n[ 173.676016] [\u003cc1063502\u003e] lockdep_rcu_dereference+0x7d/0x86\n[ 173.676016] [\u003cc10e3db5\u003e] migrate_page_move_mapping+0xca/0x1ab\n[ 173.676016] [\u003cc10e41ad\u003e] migrate_page+0x23/0x39\n[ 173.676016] [\u003cc10e491b\u003e] buffer_migrate_page+0x22/0x107\n[ 173.676016] [\u003cc10e48f9\u003e] ? buffer_migrate_page+0x0/0x107\n[ 173.676016] [\u003cc10e425d\u003e] move_to_new_page+0x9a/0x1ae\n[ 173.676016] [\u003cc10e47e6\u003e] migrate_pages+0x1e7/0x2fa\n\nThis patch introduces radix_tree_deref_slot_protected() which calls\nrcu_dereference_protected(). Users of it must pass in the\nmapping-\u003etree_lock that is protecting this dereference. Holding the tree\nlock protects against parallel updaters of the radix tree meaning that\nrcu_dereference_protected is allowable.\n\n[akpm@linux-foundation.org: remove unneeded casts]\nSigned-off-by: Mel Gorman \u003cmel@csn.ul.ie\u003e\nCc: Minchan Kim \u003cminchan.kim@gmail.com\u003e\nCc: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nCc: Milton Miller \u003cmiltonm@bga.com\u003e\nCc: Nick Piggin \u003cnickpiggin@yahoo.com.au\u003e\nCc: Wu Fengguang \u003cfengguang.wu@intel.com\u003e\nCc: \u003cstable@kernel.org\u003e\t\t[2.6.37.early]\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "500d65d471018d9a13b0d51b7e141ed2a3555c1d", "tree": "046dc2337f87a1a365fde126fab7f4ac9ae82793", "parents": [ "0af4e98b6b095c74588af04872f83d333c958c32" ], "author": { "name": "Andrea Arcangeli", "email": "aarcange@redhat.com", "time": "Thu Jan 13 15:46:55 2011 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Thu Jan 13 17:32:42 2011 -0800" }, "message": "thp: pmd_trans_huge migrate bugcheck\n\nNo pmd_trans_huge should ever materialize in migration ptes areas, because\nwe split the hugepage before migration ptes are instantiated.\n\nSigned-off-by: Andrea Arcangeli \u003caarcange@redhat.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": "7f0f24967b0349798803260b2e4bf347cffa1990", "tree": "80448367dd2403f02e74f90671e1f050aea41292", "parents": [ "77f1fe6b08b13a87391549c8a820ddc817b6f50e" ], "author": { "name": "Mel Gorman", "email": "mel@csn.ul.ie", "time": "Thu Jan 13 15:45:58 2011 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Thu Jan 13 17:32:34 2011 -0800" }, "message": "mm: migration: cleanup migrate_pages API by matching types for offlining and sync\n\nWith the introduction of the boolean sync parameter, the API looks a\nlittle inconsistent as offlining is still an int. Convert offlining to a\nbool for the sake of being tidy.\n\nSigned-off-by: Mel Gorman \u003cmel@csn.ul.ie\u003e\nCc: Andrea Arcangeli \u003caarcange@redhat.com\u003e\nCc: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nCc: Rik van Riel \u003criel@redhat.com\u003e\nAcked-by: Johannes Weiner \u003channes@cmpxchg.org\u003e\nCc: Andy Whitcroft \u003capw@shadowen.org\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "77f1fe6b08b13a87391549c8a820ddc817b6f50e", "tree": "720865bd0994da3787b6f37d33b2ee4c26a2de6c", "parents": [ "3e7d344970673c5334cf7b5bb27c8c0942b06126" ], "author": { "name": "Mel Gorman", "email": "mel@csn.ul.ie", "time": "Thu Jan 13 15:45:57 2011 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Thu Jan 13 17:32:34 2011 -0800" }, "message": "mm: migration: allow migration to operate asynchronously and avoid synchronous compaction in the faster path\n\nMigration synchronously waits for writeback if the initial passes fails.\nCallers of memory compaction do not necessarily want this behaviour if the\ncaller is latency sensitive or expects that synchronous migration is not\ngoing to have a significantly better success rate.\n\nThis patch adds a sync parameter to migrate_pages() allowing the caller to\nindicate if wait_on_page_writeback() is allowed within migration or not.\nFor reclaim/compaction, try_to_compact_pages() is first called\nasynchronously, direct reclaim runs and then try_to_compact_pages() is\ncalled synchronously as there is a greater expectation that it\u0027ll succeed.\n\n[akpm@linux-foundation.org: build/merge fix]\nSigned-off-by: Mel Gorman \u003cmel@csn.ul.ie\u003e\nCc: Andrea Arcangeli \u003caarcange@redhat.com\u003e\nCc: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nCc: Rik van Riel \u003criel@redhat.com\u003e\nAcked-by: Johannes Weiner \u003channes@cmpxchg.org\u003e\nCc: Andy Whitcroft \u003capw@shadowen.org\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "3e7d344970673c5334cf7b5bb27c8c0942b06126", "tree": "832ecb4da5fd27efa5a503df5b96bfdee2a52ffd", "parents": [ "ee64fc9354e515a79c7232cfde65c88ec627308b" ], "author": { "name": "Mel Gorman", "email": "mel@csn.ul.ie", "time": "Thu Jan 13 15:45:56 2011 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Thu Jan 13 17:32:33 2011 -0800" }, "message": "mm: vmscan: reclaim order-0 and use compaction instead of lumpy reclaim\n\nLumpy reclaim is disruptive. It reclaims a large number of pages and\nignores the age of the pages it reclaims. This can incur significant\nstalls and potentially increase the number of major faults.\n\nCompaction has reached the point where it is considered reasonably stable\n(meaning it has passed a lot of testing) and is a potential candidate for\ndisplacing lumpy reclaim. This patch introduces an alternative to lumpy\nreclaim whe compaction is available called reclaim/compaction. The basic\noperation is very simple - instead of selecting a contiguous range of\npages to reclaim, a number of order-0 pages are reclaimed and then\ncompaction is later by either kswapd (compact_zone_order()) or direct\ncompaction (__alloc_pages_direct_compact()).\n\n[akpm@linux-foundation.org: fix build]\n[akpm@linux-foundation.org: use conventional task_struct naming]\nSigned-off-by: Mel Gorman \u003cmel@csn.ul.ie\u003e\nCc: Andrea Arcangeli \u003caarcange@redhat.com\u003e\nCc: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nCc: Rik van Riel \u003criel@redhat.com\u003e\nAcked-by: Johannes Weiner \u003channes@cmpxchg.org\u003e\nCc: Andy Whitcroft \u003capw@shadowen.org\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "0d1836c366157994474afd29632992375a3dd20c", "tree": "7083f69ed1ed8900a8883d675f225596fb0f553a", "parents": [ "118364948fad7b6c0469ef2d3ddaee447d7a0b5f" ], "author": { "name": "Michal Nazarewicz", "email": "m.nazarewicz@samsung.com", "time": "Tue Dec 21 17:24:26 2010 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Wed Dec 22 19:43:34 2010 -0800" }, "message": "mm/migrate.c: fix compilation error\n\nGCC complained about update_mmu_cache() not being defined in migrate.c.\nIncluding \u003casm/tlbflush.h\u003e seems to solve the problem.\n\nSigned-off-by: Michal Nazarewicz \u003cm.nazarewicz@samsung.com\u003e\nSigned-off-by: Kyungmin Park \u003ckyungmin.park@samsung.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "70384dc6dcc6aa76762200262820bdb8b724ecd5", "tree": "2a1692b185b2bbb9dc3890cdb897ef2a0d375c15", "parents": [ "66d7dd518ae413a383ab2c6c263cc30617329842" ], "author": { "name": "Gleb Natapov", "email": "gleb@redhat.com", "time": "Tue Oct 26 14:22:07 2010 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Oct 26 16:52:11 2010 -0700" }, "message": "mm: fix error reporting in move_pages() syscall\n\nThe vma returned by find_vma does not necessarily include the target\naddress. If this happens the code tries to follow a page outside of any\nvma and returns ENOENT instead of EFAULT.\n\nSigned-off-by: Gleb Natapov \u003cgleb@redhat.com\u003e\nAcked-by: Christoph Lameter \u003ccl@linux-foundation.org\u003e\nCc: Minchan Kim \u003cminchan.kim@gmail.com\u003e\nCc: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.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": "cf608ac19c95804dc2df43b1f4f9e068aa9034ab", "tree": "a84d37df2b0bb57bd9a4b0b466726f5343fa5448", "parents": [ "e4455abb50a19562dbfdc51a8424fda9b588bd6d" ], "author": { "name": "Minchan Kim", "email": "minchan.kim@gmail.com", "time": "Tue Oct 26 14:21:29 2010 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Oct 26 16:52:06 2010 -0700" }, "message": "mm: compaction: fix COMPACTPAGEFAILED counting\n\nPresently update_nr_listpages() doesn\u0027t have a role. That\u0027s because lists\npassed is always empty just after calling migrate_pages. The\nmigrate_pages cleans up page list which have failed to migrate before\nreturning by aaa994b3.\n\n [PATCH] page migration: handle freeing of pages in migrate_pages()\n\n Do not leave pages on the lists passed to migrate_pages(). Seems that we will\n not need any postprocessing of pages. This will simplify the handling of\n pages by the callers of migrate_pages().\n\nAt that time, we thought we don\u0027t need any postprocessing of pages. But\nthe situation is changed. The compaction need to know the number of\nfailed to migrate for COMPACTPAGEFAILED stat\n\nThis patch makes new rule for caller of migrate_pages to call\nputback_lru_pages. So caller need to clean up the lists so it has a\nchance to postprocess the pages. [suggested by Christoph Lameter]\n\nSigned-off-by: Minchan Kim \u003cminchan.kim@gmail.com\u003e\nCc: Hugh Dickins \u003chughd@google.com\u003e\nCc: Andi Kleen \u003candi@firstfloor.org\u003e\nReviewed-by: Mel Gorman \u003cmel@csn.ul.ie\u003e\nReviewed-by: Wu Fengguang \u003cfengguang.wu@intel.com\u003e\nAcked-by: Christoph Lameter \u003ccl@linux.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "1b430beee5e388605dfb092b214ef0320f752cf6", "tree": "c1b1ece282aab771fd1386a3fe0c6e82cb5c5bfe", "parents": [ "d19d5476f4b9f91d2de92b91588bb118beba6c0d" ], "author": { "name": "Wu Fengguang", "email": "fengguang.wu@intel.com", "time": "Tue Oct 26 14:21:26 2010 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Oct 26 16:52:05 2010 -0700" }, "message": "writeback: remove nonblocking/encountered_congestion references\n\nThis removes more dead code that was somehow missed by commit 0d99519efef\n(writeback: remove unused nonblocking and congestion checks). There are\nno behavior change except for the removal of two entries from one of the\next4 tracing interface.\n\nThe nonblocking checks in -\u003ewritepages are no longer used because the\nflusher now prefer to block on get_request_wait() than to skip inodes on\nIO congestion. The latter will lead to more seeky IO.\n\nThe nonblocking checks in -\u003ewritepage are no longer used because it\u0027s\nredundant with the WB_SYNC_NONE check.\n\nWe no long set -\u003enonblocking in VM page out and page migration, because\na) it\u0027s effectively redundant with WB_SYNC_NONE in current code\nb) it\u0027s old semantic of \"Don\u0027t get stuck on request queues\" is mis-behavior:\n that would skip some dirty inodes on congestion and page out others, which\n is unfair in terms of LRU age.\n\nInspired by Christoph Hellwig. Thanks!\n\nSigned-off-by: Wu Fengguang \u003cfengguang.wu@intel.com\u003e\nCc: Theodore Ts\u0027o \u003ctytso@mit.edu\u003e\nCc: David Howells \u003cdhowells@redhat.com\u003e\nCc: Sage Weil \u003csage@newdream.net\u003e\nCc: Steve French \u003csfrench@samba.org\u003e\nCc: Chris Mason \u003cchris.mason@oracle.com\u003e\nCc: Jens Axboe \u003caxboe@kernel.dk\u003e\nCc: Christoph Hellwig \u003chch@infradead.org\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "3ef8fd7f720fc4f462fcdcae2fcde6f1c0536bfe", "tree": "05d6f2c62c9c00c0ab717f6a14a449684f3441d3", "parents": [ "f672b49b07a4a152fc4251f2aec6b4d05164c4cd" ], "author": { "name": "Andi Kleen", "email": "ak@linux.intel.com", "time": "Mon Oct 11 16:03:21 2010 +0200" }, "committer": { "name": "Andi Kleen", "email": "ak@linux.intel.com", "time": "Mon Oct 11 16:57:39 2010 +0200" }, "message": "Fix migration.c compilation on s390\n\n31bit s390 doesn\u0027t have huge pages and failed with:\n\n\u003e mm/migrate.c: In function \u0027remove_migration_pte\u0027:\n\u003e mm/migrate.c:143:3: error: implicit declaration of function \u0027pte_mkhuge\u0027\n\u003e mm/migrate.c:143:7: error: incompatible types when assigning to type \u0027pte_t\u0027 from type \u0027int\u0027\n\nPut that code into a ifdef.\n\nReported by Heiko Carstens\n\nSigned-off-by: Andi Kleen \u003cak@linux.intel.com\u003e\n" }, { "commit": "290408d4a25002f099efeee7b6a5778d431154d6", "tree": "c0a69a11ce963ef8a22607f5e782ae667ca5d538", "parents": [ "0ebabb416f585ace711769057422af4bbc9d1110" ], "author": { "name": "Naoya Horiguchi", "email": "n-horiguchi@ah.jp.nec.com", "time": "Wed Sep 08 10:19:35 2010 +0900" }, "committer": { "name": "Andi Kleen", "email": "ak@linux.intel.com", "time": "Fri Oct 08 09:32:45 2010 +0200" }, "message": "hugetlb: hugepage migration core\n\nThis patch extends page migration code to support hugepage migration.\nOne of the potential users of this feature is soft offlining which\nis triggered by memory corrected errors (added by the next patch.)\n\nTodo:\n- there are other users of page migration such as memory policy,\n memory hotplug and memocy compaction.\n They are not ready for hugepage support for now.\n\nChangeLog since v4:\n- define migrate_huge_pages()\n- remove changes on isolation/putback_lru_page()\n\nChangeLog since v2:\n- refactor isolate/putback_lru_page() to handle hugepage\n- add comment about race on unmap_and_move_huge_page()\n\nChangeLog since v1:\n- divide migration code path for hugepage\n- define routine checking migration swap entry for hugetlb\n- replace \"goto\" with \"if/else\" in remove_migration_pte()\n\nSigned-off-by: Naoya Horiguchi \u003cn-horiguchi@ah.jp.nec.com\u003e\nSigned-off-by: Jun\u0027ichi Nomura \u003cj-nomura@ce.jp.nec.com\u003e\nAcked-by: Mel Gorman \u003cmel@csn.ul.ie\u003e\nSigned-off-by: Andi Kleen \u003cak@linux.intel.com\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": "012f18004da33ba672e3c60838cc4898126174d3", "tree": "990382f9f8c0d885463ac9195b8e9a18043f716d", "parents": [ "5c341ee1dfc8fe69d66b1c8b19e463c6d7201ae1" ], "author": { "name": "Rik van Riel", "email": "riel@redhat.com", "time": "Mon Aug 09 17:18:40 2010 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Aug 09 20:44:55 2010 -0700" }, "message": "mm: always lock the root (oldest) anon_vma\n\nAlways (and only) lock the root (oldest) anon_vma whenever we do something\nin an anon_vma. The recently introduced anon_vma scalability is due to\nthe rmap code scanning only the VMAs that need to be scanned. Many common\noperations still took the anon_vma lock on the root anon_vma, so always\ntaking that lock is not expected to introduce any scalability issues.\n\nHowever, always taking the same lock does mean we only need to take one\nlock, which means rmap_walk on pages from any anon_vma in the vma is\nexcluded from occurring during an munmap, expand_stack or other operation\nthat needs to exclude rmap_walk and similar functions.\n\nAlso add the proper locking to vma_adjust.\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\nReviewed-by: 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\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": "ac39cf8cb86c45eeac6a592ce0d58f9021a97235", "tree": "7321cafb0a1f8f2727c86f9d29159751df856c59", "parents": [ "315c1998e10527ff364a9883048455e609bc7232" ], "author": { "name": "akpm@linux-foundation.org", "email": "akpm@linux-foundation.org", "time": "Wed May 26 14:42:46 2010 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Thu May 27 09:12:44 2010 -0700" }, "message": "memcg: fix mis-accounting of file mapped racy with migration\n\nFILE_MAPPED per memcg of migrated file cache is not properly updated,\nbecause our hook in page_add_file_rmap() can\u0027t know to which memcg\nFILE_MAPPED should be counted.\n\nBasically, this patch is for fixing the bug but includes some big changes\nto fix up other messes.\n\nNow, at migrating mapped file, events happen in following sequence.\n\n 1. allocate a new page.\n 2. get memcg of an old page.\n 3. charge ageinst a new page before migration. But at this point,\n no changes to new page\u0027s page_cgroup, no commit for the charge.\n (IOW, PCG_USED bit is not set.)\n 4. page migration replaces radix-tree, old-page and new-page.\n 5. page migration remaps the new page if the old page was mapped.\n 6. Here, the new page is unlocked.\n 7. memcg commits the charge for newpage, Mark the new page\u0027s page_cgroup\n as PCG_USED.\n\nBecause \"commit\" happens after page-remap, we can count FILE_MAPPED\nat \"5\", because we should avoid to trust page_cgroup-\u003emem_cgroup.\nif PCG_USED bit is unset.\n(Note: memcg\u0027s LRU removal code does that but LRU-isolation logic is used\n for helping it. When we overwrite page_cgroup-\u003emem_cgroup, page_cgroup is\n not on LRU or page_cgroup-\u003emem_cgroup is NULL.)\n\nWe can lose file_mapped accounting information at 5 because FILE_MAPPED\nis updated only when mapcount changes 0-\u003e1. So we should catch it.\n\nBTW, historically, above implemntation comes from migration-failure\nof anonymous page. Because we charge both of old page and new page\nwith mapcount\u003d0, we can\u0027t catch\n - the page is really freed before remap.\n - migration fails but it\u0027s freed before remap\nor .....corner cases.\n\nNew migration sequence with memcg is:\n\n 1. allocate a new page.\n 2. mark PageCgroupMigration to the old page.\n 3. charge against a new page onto the old page\u0027s memcg. (here, new page\u0027s pc\n is marked as PageCgroupUsed.)\n 4. page migration replaces radix-tree, page table, etc...\n 5. At remapping, new page\u0027s page_cgroup is now makrked as \"USED\"\n We can catch 0-\u003e1 event and FILE_MAPPED will be properly updated.\n\n And we can catch SWAPOUT event after unlock this and freeing this\n page by unmap() can be caught.\n\n 7. Clear PageCgroupMigration of the old page.\n\nSo, FILE_MAPPED will be correctly updated.\n\nThen, for what MIGRATION flag is ?\n Without it, at migration failure, we may have to charge old page again\n because it may be fully unmapped. \"charge\" means that we have to dive into\n memory reclaim or something complated. So, it\u0027s better to avoid\n charge it again. Before this patch, __commit_charge() was working for\n both of the old/new page and fixed up all. But this technique has some\n racy condtion around FILE_MAPPED and SWAPOUT etc...\n Now, the kernel use MIGRATION flag and don\u0027t uncharge old page until\n the end of migration.\n\nI hope this change will make memcg\u0027s page migration much simpler. This\npage migration has caused several troubles. Worth to add a flag for\nsimplification.\n\nReviewed-by: Daisuke Nishimura \u003cnishimura@mxp.nes.nec.co.jp\u003e\nTested-by: Daisuke Nishimura \u003cnishimura@mxp.nes.nec.co.jp\u003e\nReported-by: Daisuke Nishimura \u003cnishimura@mxp.nes.nec.co.jp\u003e\nSigned-off-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nCc: Balbir Singh \u003cbalbir@in.ibm.com\u003e\nCc: Christoph Lameter \u003ccl@linux-foundation.org\u003e\nCc: \"Kirill A. Shutemov\" \u003ckirill@shutemov.name\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "748446bb6b5a9390b546af38ec899c868a9dbcf0", "tree": "4c27d0805a5e094b39ff938ad60dd270b953a79f", "parents": [ "c175a0ce7584e5b498fff8cbdb9aa7912aa9fbba" ], "author": { "name": "Mel Gorman", "email": "mel@csn.ul.ie", "time": "Mon May 24 14:32:27 2010 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue May 25 08:06:59 2010 -0700" }, "message": "mm: compaction: memory compaction core\n\nThis patch is the core of a mechanism which compacts memory in a zone by\nrelocating movable pages towards the end of the zone.\n\nA single compaction run involves a migration scanner and a free scanner.\nBoth scanners operate on pageblock-sized areas in the zone. The migration\nscanner starts at the bottom of the zone and searches for all movable\npages within each area, isolating them onto a private list called\nmigratelist. The free scanner starts at the top of the zone and searches\nfor suitable areas and consumes the free pages within making them\navailable for the migration scanner. The pages isolated for migration are\nthen migrated to the newly isolated free pages.\n\n[aarcange@redhat.com: Fix unsafe optimisation]\n[mel@csn.ul.ie: do not schedule work on other CPUs for compaction]\nSigned-off-by: Mel Gorman \u003cmel@csn.ul.ie\u003e\nAcked-by: Rik van Riel \u003criel@redhat.com\u003e\nReviewed-by: 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": "3fe2011ff51e92500010a495df4be86745fbbda9", "tree": "f3dc07b9d41ce5ba15805c2d3b4bc0a1a7916832", "parents": [ "67b9509b2c68ae38cecb83a239881cb0ddf087dc" ], "author": { "name": "Mel Gorman", "email": "mel@csn.ul.ie", "time": "Mon May 24 14:32:20 2010 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue May 25 08:06:59 2010 -0700" }, "message": "mm: migration: allow the migration of PageSwapCache pages\n\nPageAnon pages that are unmapped may or may not have an anon_vma so are\nnot currently migrated. However, a swap cache page can be migrated and\nfits this description. This patch identifies page swap caches and allows\nthem to be migrated but ensures that no attempt to made to remap the pages\nwould would potentially try to access an already freed anon_vma.\n\nSigned-off-by: Mel Gorman \u003cmel@csn.ul.ie\u003e\nReviewed-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nReviewed-by: Minchan Kim \u003cminchan.kim@gmail.com\u003e\nCc: Rik van Riel \u003criel@redhat.com\u003e\nCc: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nCc: Christoph Lameter \u003ccl@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": "67b9509b2c68ae38cecb83a239881cb0ddf087dc", "tree": "a8cee4f4bec57ab44a993ce81df2a10a4980f0f8", "parents": [ "7f60c214fd3a360461f3286c6908084f7f8b1950" ], "author": { "name": "Mel Gorman", "email": "mel@csn.ul.ie", "time": "Mon May 24 14:32:19 2010 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue May 25 08:06:58 2010 -0700" }, "message": "mm: migration: do not try to migrate unmapped anonymous pages\n\nrmap_walk_anon() was triggering errors in memory compaction that look like\nuse-after-free errors. The problem is that between the page being\nisolated from the LRU and rcu_read_lock() being taken, the mapcount of the\npage dropped to 0 and the anon_vma gets freed. This can happen during\nmemory compaction if pages being migrated belong to a process that exits\nbefore migration completes. Hence, the use-after-free race looks like\n\n 1. Page isolated for migration\n 2. Process exits\n 3. page_mapcount(page) drops to zero so anon_vma was no longer reliable\n 4. unmap_and_move() takes the rcu_lock but the anon_vma is already garbage\n 4. call try_to_unmap, looks up tha anon_vma and \"locks\" it but the lock\n is garbage.\n\nThis patch checks the mapcount after the rcu lock is taken. If the\nmapcount is zero, the anon_vma is assumed to be freed and no further\naction is taken.\n\nSigned-off-by: Mel Gorman \u003cmel@csn.ul.ie\u003e\nAcked-by: Rik van Riel \u003criel@redhat.com\u003e\nReviewed-by: Minchan Kim \u003cminchan.kim@gmail.com\u003e\nReviewed-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nCc: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nCc: Christoph Lameter \u003ccl@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": "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": "e13861d822f8f443ca0c020ea8fc2dc01039cd63", "tree": "0e1ccaa6a2d682f7636b9d5ef5d4c73a28074988", "parents": [ "4b50dc26a0a25a9d1998d206e1f7d849aa78063f" ], "author": { "name": "Minchan Kim", "email": "minchan.kim@gmail.com", "time": "Mon May 24 14:31:59 2010 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue May 25 08:06:57 2010 -0700" }, "message": "mm: remove return value of putback_lru_pages()\n\nputback_lru_page() never can fail. So it doesn\u0027t matter count of \"the\nnumber of pages put back\".\n\nIn addition, users of this functions don\u0027t use return value.\n\nLet\u0027s remove unnecessary code.\n\nSigned-off-by: Minchan Kim \u003cminchan.kim@gmail.com\u003e\nReviewed-by: Rik van Riel \u003criel@redhat.com\u003e\nReviewed-by: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nReviewed-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": "5a0e3ad6af8660be21ca98a971cd00f331318c05", "tree": "5bfb7be11a03176a87296a43ac6647975c00a1d1", "parents": [ "ed391f4ebf8f701d3566423ce8f17e614cde9806" ], "author": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Wed Mar 24 17:04:11 2010 +0900" }, "committer": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Tue Mar 30 22:02:32 2010 +0900" }, "message": "include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h\n\npercpu.h is included by sched.h and module.h and thus ends up being\nincluded when building most .c files. percpu.h includes slab.h which\nin turn includes gfp.h making everything defined by the two files\nuniversally available and complicating inclusion dependencies.\n\npercpu.h -\u003e slab.h dependency is about to be removed. Prepare for\nthis change by updating users of gfp and slab facilities include those\nheaders directly instead of assuming availability. As this conversion\nneeds to touch large number of source files, the following script is\nused as the basis of conversion.\n\n http://userweb.kernel.org/~tj/misc/slabh-sweep.py\n\nThe script does the followings.\n\n* Scan files for gfp and slab usages and update includes such that\n only the necessary includes are there. ie. if only gfp is used,\n gfp.h, if slab is used, slab.h.\n\n* When the script inserts a new include, it looks at the include\n blocks and try to put the new include such that its order conforms\n to its surrounding. It\u0027s put in the include block which contains\n core kernel includes, in the same order that the rest are ordered -\n alphabetical, Christmas tree, rev-Xmas-tree or at the end if there\n doesn\u0027t seem to be any matching order.\n\n* If the script can\u0027t find a place to put a new include (mostly\n because the file doesn\u0027t have fitting include block), it prints out\n an error message indicating which .h file needs to be added to the\n file.\n\nThe conversion was done in the following steps.\n\n1. The initial automatic conversion of all .c files updated slightly\n over 4000 files, deleting around 700 includes and adding ~480 gfp.h\n and ~3000 slab.h inclusions. The script emitted errors for ~400\n files.\n\n2. Each error was manually checked. Some didn\u0027t need the inclusion,\n some needed manual addition while adding it to implementation .h or\n embedding .c file was more appropriate for others. This step added\n inclusions to around 150 files.\n\n3. The script was run again and the output was compared to the edits\n from #2 to make sure no file was left behind.\n\n4. Several build tests were done and a couple of problems were fixed.\n e.g. lib/decompress_*.c used malloc/free() wrappers around slab\n APIs requiring slab.h to be added manually.\n\n5. The script was run on all .h files but without automatically\n editing them as sprinkling gfp.h and slab.h inclusions around .h\n files could easily lead to inclusion dependency hell. Most gfp.h\n inclusion directives were ignored as stuff from gfp.h was usually\n wildly available and often used in preprocessor macros. Each\n slab.h inclusion directive was examined and added manually as\n necessary.\n\n6. percpu.h was updated not to include slab.h.\n\n7. Build test were done on the following configurations and failures\n were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my\n distributed build env didn\u0027t work with gcov compiles) and a few\n more options had to be turned off depending on archs to make things\n build (like ipr on powerpc/64 which failed due to missing writeq).\n\n * x86 and x86_64 UP and SMP allmodconfig and a custom test config.\n * powerpc and powerpc64 SMP allmodconfig\n * sparc and sparc64 SMP allmodconfig\n * ia64 SMP allmodconfig\n * s390 SMP allmodconfig\n * alpha SMP allmodconfig\n * um on x86_64 SMP allmodconfig\n\n8. percpu.h modifications were reverted so that it could be applied as\n a separate patch and serve as bisection point.\n\nGiven the fact that I had only a couple of failures from tests on step\n6, I\u0027m fairly confident about the coverage of this conversion patch.\nIf there is a breakage, it\u0027s likely to be something in one of the arch\nheaders which should be easily discoverable easily on most builds of\nthe specific arch.\n\nSigned-off-by: Tejun Heo \u003ctj@kernel.org\u003e\nGuess-its-ok-by: Christoph Lameter \u003ccl@linux-foundation.org\u003e\nCc: Ingo Molnar \u003cmingo@redhat.com\u003e\nCc: Lee Schermerhorn \u003cLee.Schermerhorn@hp.com\u003e\n" }, { "commit": "85f1fb72fa76eabc4481dc79f42d2b011df54762", "tree": "04dbf3b20c3ecb6959b0591027529d89de633a8d", "parents": [ "da0aa138944311e6745a00ac3d88f03e8d9a46c4" ], "author": { "name": "KOSAKI Motohiro", "email": "kosaki.motohiro@jp.fujitsu.com", "time": "Fri Mar 05 13:42:00 2010 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Sat Mar 06 11:26:25 2010 -0800" }, "message": "mm/migrate.c: kill anon local variable from migrate_page_copy\n\ncommit 01b1ae63c2 (\"memcg: simple migration handling\") removed\nmem_cgroup_uncharge_cache_page() call from migrate_page_copy. Local\nvariable `anon\u0027 is now unused.\n\nSigned-off-by: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nCc: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nCc: Daisuke Nishimura \u003cnishimura@mxp.nes.nec.co.jp\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "ac0f6f927db539e03e1f3f61bcd4ed57d5cde7a9", "tree": "816e5ac643b15c2050c64a7075f0f7e13d86ea09", "parents": [ "b1bf9368407ae7e89d8a005bb40beb70a41df539", "9f33be2c3a80bdc2cc08342dd77fac87652e0548" ], "author": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Mar 01 09:15:15 2010 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Mar 01 09:15:15 2010 -0800" }, "message": "Merge branch \u0027for-linus\u0027 of master.kernel.org:/home/rmk/linux-2.6-arm\n\n* \u0027for-linus\u0027 of master.kernel.org:/home/rmk/linux-2.6-arm: (100 commits)\n ARM: Eliminate decompressor -Dstatic\u003d PIC hack\n ARM: 5958/1: ARM: U300: fix inverted clk round rate\n ARM: 5956/1: misplaced parentheses\n ARM: 5955/1: ep93xx: move timer defines into core.c and document\n ARM: 5954/1: ep93xx: move gpio interrupt support to gpio.c\n ARM: 5953/1: ep93xx: fix broken build of clock.c\n ARM: 5952/1: ARM: MM: Add ARM_L1_CACHE_SHIFT_6 for handle inside each ARCH Kconfig\n ARM: 5949/1: NUC900 add gpio virtual memory map\n ARM: 5948/1: Enable timer0 to time4 clock support for nuc910\n ARM: 5940/2: ARM: MMCI: remove custom DBG macro and printk\n ARM: make_coherent(): fix problems with highpte, part 2\n MM: Pass a PTE pointer to update_mmu_cache() rather than the PTE itself\n ARM: 5945/1: ep93xx: include correct irq.h in core.c\n ARM: 5933/1: amba-pl011: support hardware flow control\n ARM: 5930/1: Add PKMAP area description to memory.txt.\n ARM: 5929/1: Add checks to detect overlap of memory regions.\n ARM: 5928/1: Change type of VMALLOC_END to unsigned long.\n ARM: 5927/1: Make delimiters of DMA area globally visibly.\n ARM: 5926/1: Add \"Virtual kernel memory...\" printout.\n ARM: 5920/1: OMAP4: Enable L2 Cache\n ...\n\nFix up trivial conflict in arch/arm/mach-mx25/clock.c\n" }, { "commit": "87b8d1adefa1548b591cbf0d63965987e2cf893d", "tree": "9bb71e42dfed2ac212a9dc55dd5e2ba1f8d042ac", "parents": [ "aea187c46f7d03ce985e55eb1398d0776a15b928" ], "author": { "name": "H. Peter Anvin", "email": "hpa@zytor.com", "time": "Thu Feb 18 16:13:40 2010 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Sun Feb 21 08:57:08 2010 -0800" }, "message": "mm: Make copy_from_user() in migrate.c statically predictable\n\nx86-32 has had a static test for copy_on_user() overflow for a while.\nThis test currently fails in mm/migrate.c resulting in an\nallyesconfig/allmodconfig build failure on x86-32:\n\nIn function ‘copy_from_user’,\n inlined from ‘do_pages_stat’ at\n /home/hpa/kernel/git/mm/migrate.c:1012:\n/home/hpa/kernel/git/arch/x86/include/asm/uaccess_32.h:212: error:\n call to ‘copy_from_user_overflow’ declared\n\nMake the logic more explicit and therefore easier for gcc to\nunderstand.\n\nv2: rewrite the loop entirely using a more normal structure for a\n chunked-data loop (Linus Torvalds)\n\nReported-by: Len Brown \u003clenb@kernel.org\u003e\nSigned-off-by: H. Peter Anvin \u003chpa@zytor.com\u003e\nReviewed-and-Tested-by: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nCc: Arjan van de Ven \u003carjan@linux.kernel.org\u003e\nCc: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nCc: Christoph Lameter \u003ccl@linux-foundation.org\u003e\nCc: Hugh Dickins \u003chugh.dickins@tiscali.co.uk\u003e\nCc: Rik van Riel \u003criel@redhat.com\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "4b3073e1c53a256275f1079c0fbfbe85883d9275", "tree": "a0fa98cb75edbbc58c43bbe38ac4c6da0913ae6d", "parents": [ "ed42acaef1a9d51631a31b55e9ed52d400430492" ], "author": { "name": "Russell King", "email": "rmk+kernel@arm.linux.org.uk", "time": "Fri Dec 18 16:40:18 2009 +0000" }, "committer": { "name": "Russell King", "email": "rmk+kernel@arm.linux.org.uk", "time": "Sat Feb 20 16:41:46 2010 +0000" }, "message": "MM: Pass a PTE pointer to update_mmu_cache() rather than the PTE itself\n\nOn VIVT ARM, when we have multiple shared mappings of the same file\nin the same MM, we need to ensure that we have coherency across all\ncopies. We do this via make_coherent() by making the pages\nuncacheable.\n\nThis used to work fine, until we allowed highmem with highpte - we\nnow have a page table which is mapped as required, and is not available\nfor modification via update_mmu_cache().\n\nRalf Beache suggested getting rid of the PTE value passed to\nupdate_mmu_cache():\n\n On MIPS update_mmu_cache() calls __update_tlb() which walks pagetables\n to construct a pointer to the pte again. Passing a pte_t * is much\n more elegant. Maybe we might even replace the pte argument with the\n pte_t?\n\nBen Herrenschmidt would also like the pte pointer for PowerPC:\n\n Passing the ptep in there is exactly what I want. I want that\n -instead- of the PTE value, because I have issue on some ppc cases,\n for I$/D$ coherency, where set_pte_at() may decide to mask out the\n _PAGE_EXEC.\n\nSo, pass in the mapped page table pointer into update_mmu_cache(), and\nremove the PTE value, updating all implementations and call sites to\nsuit.\n\nIncludes a fix from Stephen Rothwell:\n\n sparc: fix fallout from update_mmu_cache API change\n\n Signed-off-by: Stephen Rothwell \u003csfr@canb.auug.org.au\u003e\n\nAcked-by: Benjamin Herrenschmidt \u003cbenh@kernel.crashing.org\u003e\nSigned-off-by: Russell King \u003crmk+kernel@arm.linux.org.uk\u003e\n" }, { "commit": "6f5a55f1a6c5abee15a0e878e5c74d9f1569b8b0", "tree": "2b5304a71a3b2ef2f0665e4e2d9262c6c6918848", "parents": [ "9d9c3a51e7b20dcd63b8cc534035af99a41d03e4" ], "author": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Fri Feb 05 16:16:50 2010 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Sat Feb 06 13:00:37 2010 -0800" }, "message": "Fix potential crash with sys_move_pages\n\nWe incorrectly depended on the \u0027node_state/node_isset()\u0027 functions\ntesting the node range, rather than checking it explicitly. That\u0027s not\nreliable, even if it might often happen to work. So do the proper\nexplicit test.\n\nReported-by: Marcus Meissner \u003cmeissner@suse.de\u003e\nAcked-and-tested-by: Brice Goglin \u003cBrice.Goglin@inria.fr\u003e\nAcked-by: Hugh Dickins \u003chugh.dickins@tiscali.co.uk\u003e\nCc: stable@kernel.org\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "418b27ef50e7e9b0c2fbd88db804bf065e5eb1a6", "tree": "24a4354bfa3bda6c763b859c235669c939c97ce4", "parents": [ "4eb2b1dcd598f8489130405c81c60c289896d92a" ], "author": { "name": "Lee Schermerhorn", "email": "Lee.Schermerhorn@hp.com", "time": "Mon Dec 14 17:59:54 2009 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Dec 15 08:53:23 2009 -0800" }, "message": "mm: remove unevictable_migrate_page function\n\nunevictable_migrate_page() in mm/internal.h is a relic of the since\nremoved UNEVICTABLE_LRU Kconfig option. This patch removes the function\nand open codes the test in migrate_page_copy().\n\nSigned-off-by: Lee Schermerhorn \u003clee.schermerhorn@hp.com\u003e\nReviewed-by: Christoph Lameter \u003ccl@linux-foundation.org\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": "62b61f611eb5e20f7e9f8619bfd03bdfe8af6348", "tree": "9f06fff7eb6530fbe90b4d998b91071133f6af25", "parents": [ "e9995ef978a7d5296fe04a9a2c5ca6e66d8bb4e5" ], "author": { "name": "Hugh Dickins", "email": "hugh.dickins@tiscali.co.uk", "time": "Mon Dec 14 17:59:33 2009 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Dec 15 08:53:20 2009 -0800" }, "message": "ksm: memory hotremove migration only\n\nThe previous patch enables page migration of ksm pages, but that soon gets\ninto trouble: not surprising, since we\u0027re using the ksm page lock to lock\noperations on its stable_node, but page migration switches the page whose\nlock is to be used for that. Another layer of locking would fix it, but\ndo we need that yet?\n\nDo we actually need page migration of ksm pages? Yes, memory hotremove\nneeds to offline sections of memory: and since we stopped allocating ksm\npages with GFP_HIGHUSER, they will tend to be GFP_HIGHUSER_MOVABLE\ncandidates for migration.\n\nBut KSM is currently unconscious of NUMA issues, happily merging pages\nfrom different NUMA nodes: at present the rule must be, not to use\nMADV_MERGEABLE where you care about NUMA. So no, NUMA page migration of\nksm pages does not make sense yet.\n\nSo, to complete support for ksm swapping we need to make hotremove safe.\nksm_memory_callback() take ksm_thread_mutex when MEM_GOING_OFFLINE and\nrelease it when MEM_OFFLINE or MEM_CANCEL_OFFLINE. But if mapped pages\nare freed before migration reaches them, stable_nodes may be left still\npointing to struct pages which have been removed from the system: the\nstable_node needs to identify a page by pfn rather than page pointer, then\nit can safely prune them when MEM_OFFLINE.\n\nAnd make NUMA migration skip PageKsm pages where it skips PageReserved.\nBut it\u0027s only when we reach unmap_and_move() that the page lock is taken\nand we can be sure that raised pagecount has prevented a PageAnon from\nbeing upgraded: so add offlining arg to migrate_pages(), to migrate ksm\npage when offlining (has sufficient locking) but reject it otherwise.\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": "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": "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": "6d9c285a632b39ab83c6ae14cbff0e606d4042ee", "tree": "e8d334046befcce98abd9ac8bd5350597fe5a59f", "parents": [ "ee32398fda8ab9867cf8d5469d6e83de5f5c1f7c" ], "author": { "name": "KOSAKI Motohiro", "email": "kosaki.motohiro@jp.fujitsu.com", "time": "Mon Dec 14 17:58:11 2009 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Dec 15 08:53:12 2009 -0800" }, "message": "mm: move inc_zone_page_state(NR_ISOLATED) to just isolated place\n\nChristoph pointed out inc_zone_page_state(NR_ISOLATED) should be placed\nin right after isolate_page().\n\nThis patch does it.\n\nReviewed-by: Christoph Lameter \u003ccl@linux-foundation.org\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": "b925585039cf39275c2e0e57512e5df27fa73aad", "tree": "1e264b4e3470013aabc10c27bf5054729b5b269f", "parents": [ "2eaad1fddd7450a48ad464229775f97fbfe8af36" ], "author": { "name": "H. Peter Anvin", "email": "hpa@zytor.com", "time": "Tue Dec 08 14:01:32 2009 -0800" }, "committer": { "name": "H. Peter Anvin", "email": "hpa@zytor.com", "time": "Fri Dec 11 15:27:47 2009 -0800" }, "message": "mm: Adjust do_pages_stat() so gcc can see copy_from_user() is safe\n\nSlightly adjust the logic for determining the size of the\ncopy_form_user() in do_pages_stat(); with this change, gcc can see\nthat the copying is safe.\n\nWithout this, we get a build error for i386 allyesconfig:\n\n/home/hpa/kernel/linux-2.6-tip.urgent/arch/x86/include/asm/uaccess_32.h:213:\nerror: call to ‘copy_from_user_overflow’ declared with attribute\nerror: copy_from_user() buffer size is not provably correct\n\nUnlike an earlier patch from Arjan, this doesn\u0027t introduce new\nvariables; merely reshuffles the compare so that gcc can see that an\noverflow cannot happen.\n\nSigned-off-by: H. Peter Anvin \u003chpa@zytor.com\u003e\nCc: Brice Goglin \u003cBrice.Goglin@inria.fr\u003e\nCc: Arjan van de Ven \u003carjan@infradead.org\u003e\nCc: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nCc: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nLKML-Reference: \u003c20090926205406.30d55b08@infradead.org\u003e\n" }, { "commit": "e00e431612c3a6e437a01f2129fd3843da0c982a", "tree": "4f838123d0b295ab3608380ce803c8960a8ebfd0", "parents": [ "b9f9d4706cb1b706f89f98ea6ead41ebecdefbc2" ], "author": { "name": "KAMEZAWA Hiroyuki", "email": "kamezawa.hiroyu@jp.fujitsu.com", "time": "Wed Nov 11 14:26:26 2009 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Thu Nov 12 07:25:56 2009 -0800" }, "message": "memcg: fix wrong pointer initialization at page migration when memcg is disabled.\n\nLee Schermerhorn reported that he saw bad pointer dereference in\nmem_cgroup_end_migration() when he disabled memcg by boot option.\n\nmemcg\u0027s page migration logic works as\n\n\tmem_cgroup_prepare_migration(page, \u0026ptr);\n\tdo page migration\n\tmem_cgroup_end_migration(page, ptr);\n\nNow, ptr is not initialized in prepare_migration when memcg is disabled\nby boot option. This causes panic in end_migration. This patch fixes it.\n\nReported-by: Lee Schermerhorn \u003cLee.Schermerhorn@hp.com\u003e\nCc: Balbir Singh \u003cbalbir@in.ibm.com\u003e\nSigned-off-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nReviewed-by: Daisuke Nishimura \u003cnishimura@mxp.nes.nec.co.jp\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": "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": "edcf4748cd56adcdf0856cc99ef108a4ea3ac7fe", "tree": "317d477d08dea82f5eef2e9c17294d0f0639ea81", "parents": [ "6c0b13519d1c755d874e82c8fb8a6dcef0ee402c" ], "author": { "name": "Johannes Weiner", "email": "hannes@cmpxchg.org", "time": "Mon Sep 21 17:02:59 2009 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Sep 22 07:17:38 2009 -0700" }, "message": "mm: return boolean from page_has_private()\n\nMake page_has_private() return a true boolean value and remove the double\nnegations from the two callsites using it for arithmetic.\n\nSigned-off-by: Johannes Weiner \u003channes@cmpxchg.org\u003e\nCc: Christoph Lameter \u003ccl@linux-foundation.org\u003e\nReviewed-by: Christoph Lameter \u003ccl@linux-foundation.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": "6c0b13519d1c755d874e82c8fb8a6dcef0ee402c", "tree": "0fe6e6902a488ad6c59ecee971fe64c81edbcce3", "parents": [ "401a8e1c1670085b8177330ca47d4f7c4ac88761" ], "author": { "name": "Johannes Weiner", "email": "hannes@cmpxchg.org", "time": "Mon Sep 21 17:02:59 2009 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Sep 22 07:17:37 2009 -0700" }, "message": "mm: return boolean from page_is_file_cache()\n\npage_is_file_cache() has been used for both boolean checks and LRU\narithmetic, which was always a bit weird.\n\nNow that page_lru_base_type() exists for LRU arithmetic, make\npage_is_file_cache() a real predicate function and adjust the\nboolean-using callsites to drop those pesky double negations.\n\nSigned-off-by: Johannes Weiner \u003channes@cmpxchg.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": "a731286de62294b63d8ceb3c5914ac52cc17e690", "tree": "c321e14500ec264e37fd103ffa71c7b133088010", "parents": [ "b35ea17b7bbf5dea35faa0de11030acc620c3197" ], "author": { "name": "KOSAKI Motohiro", "email": "kosaki.motohiro@jp.fujitsu.com", "time": "Mon Sep 21 17:01:37 2009 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Sep 22 07:17:29 2009 -0700" }, "message": "mm: vmstat: add isolate pages\n\nIf the system is running a heavy load of processes then concurrent reclaim\ncan isolate a large number of pages from the LRU. /proc/vmstat and the\noutput generated for an OOM do not show how many pages were isolated.\n\nThis has been observed during process fork bomb testing (mstctl11 in LTP).\n\nThis patch shows the information about isolated pages.\n\nReproduced via:\n\n-----------------------\n% ./hackbench 140 process 1000\n \u003d\u003e OOM occur\n\nactive_anon:146 inactive_anon:0 isolated_anon:49245\n active_file:79 inactive_file:18 isolated_file:113\n unevictable:0 dirty:0 writeback:0 unstable:0 buffer:39\n free:370 slab_reclaimable:309 slab_unreclaimable:5492\n mapped:53 shmem:15 pagetables:28140 bounce:0\n\nSigned-off-by: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nAcked-by: Rik van Riel \u003criel@redhat.com\u003e\nAcked-by: Wu Fengguang \u003cfengguang.wu@intel.com\u003e\nReviewed-by: Minchan Kim \u003cminchan.kim@gmail.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": "4b02108ac1b3354a22b0d83c684797692efdc395", "tree": "9f65d6e8e35ddce940e7b9da6305cf5a19e5904e", "parents": [ "c6a7f5728a1db45d30df55a01adc130b4ab0327c" ], "author": { "name": "KOSAKI Motohiro", "email": "kosaki.motohiro@jp.fujitsu.com", "time": "Mon Sep 21 17:01:33 2009 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Sep 22 07:17:27 2009 -0700" }, "message": "mm: oom analysis: add shmem vmstat\n\nRecently we encountered OOM problems due to memory use of the GEM cache.\nGenerally a large amuont of Shmem/Tmpfs pages tend to create a memory\nshortage problem.\n\nWe often use the following calculation to determine the amount of shmem\npages:\n\nshmem \u003d NR_ACTIVE_ANON + NR_INACTIVE_ANON - NR_ANON_PAGES\n\nhowever the expression does not consider isolated and mlocked pages.\n\nThis patch adds explicit accounting for pages used by shmem and tmpfs.\n\nSigned-off-by: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nAcked-by: Rik van Riel \u003criel@redhat.com\u003e\nReviewed-by: Christoph Lameter \u003ccl@linux-foundation.org\u003e\nAcked-by: Wu Fengguang \u003cfengguang.wu@intel.com\u003e\nCc: David Rientjes \u003crientjes@google.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": "abfc3488118d48a2b8cce5a2345901aac6b03fee", "tree": "37e39eeef9cb43716339315833be3592b01f9a64", "parents": [ "f52407ce2deac76c87abc8211a63ea152ba72d54" ], "author": { "name": "Shaohua Li", "email": "shaohua.li@intel.com", "time": "Mon Sep 21 17:01:19 2009 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Sep 22 07:17:26 2009 -0700" }, "message": "memory hotplug: migrate swap cache page\n\nIn test, some pages in swap-cache can\u0027t be migrated, as they aren\u0027t rmap.\n\nunmap_and_move() ignores swap-cache page which is just read in and hasn\u0027t\nrmap (see the comments in the code), but swap_aops provides .migratepage.\nBetter to migrate such pages instead of ignore them.\n\nSigned-off-by: Shaohua Li \u003cshaohua.li@intel.com\u003e\nCc: Mel Gorman \u003cmel@csn.ul.ie\u003e\nCc: Christoph Lameter \u003ccl@linux-foundation.org\u003e\nCc: Yakui Zhao \u003cyakui.zhao@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": "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": "35282a2de4e5e4e173ab61aa9d7015886021a821", "tree": "06d20ad1a132e15e4fb7447cd9b139a4921ecfc9", "parents": [ "7f33d49a2ed546e01f7b1d0607661810f2421859" ], "author": { "name": "Brice Goglin", "email": "Brice.Goglin@ens-lyon.org", "time": "Tue Jun 16 15:32:43 2009 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Jun 16 19:47:41 2009 -0700" }, "message": "migration: only migrate_prep() once per move_pages()\n\nmigrate_prep() is fairly expensive (72us on 16-core barcelona 1.9GHz).\nCommit 3140a2273009c01c27d316f35ab76a37e105fdd8 improved move_pages()\nthroughput by breaking it into chunks, but it also made migrate_prep() be\ncalled once per chunk (every 128pages or so) instead of once per\nmove_pages().\n\nThis patch reverts to calling migrate_prep() only once per chunk as we did\nbefore 2.6.29. It is also a followup to commit\n0aedadf91a70a11c4a3e7c7d99b21e5528af8d5d (\"mm: move migrate_prep out from\nunder mmap_sem\").\n\nThis improves migration throughput on the above machine from 600MB/s to\n750MB/s.\n\nSigned-off-by: Brice Goglin \u003cBrice.Goglin@inria.fr\u003e\nAcked-by: Christoph Lameter \u003ccl@linux-foundation.org\u003e\nCc: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nCc: Heiko Carstens \u003cheiko.carstens@de.ibm.com\u003e\nCc: Nick Piggin \u003cnickpiggin@yahoo.com.au\u003e\nCc: Hugh Dickins \u003chugh.dickins@tiscali.co.uk\u003e\nCc: Rik van Riel \u003criel@redhat.com\u003e\nCc: Lee Schermerhorn \u003clee.schermerhorn@hp.com\u003e\nReviewed-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": "6484eb3e2a81807722c5f28efef94d8338b7b996", "tree": "10ce36f412c2ff0c7eb399af1a189f8e354f56db", "parents": [ "b3c466ce512923298ae8c0121d3e9f397a3f1210" ], "author": { "name": "Mel Gorman", "email": "mel@csn.ul.ie", "time": "Tue Jun 16 15:31:54 2009 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Jun 16 19:47:32 2009 -0700" }, "message": "page allocator: do not check NUMA node ID when the caller knows the node is valid\n\nCallers of alloc_pages_node() can optionally specify -1 as a node to mean\n\"allocate from the current node\". However, a number of the callers in\nfast paths know for a fact their node is valid. To avoid a comparison and\nbranch, this patch adds alloc_pages_exact_node() that only checks the nid\nwith VM_BUG_ON(). Callers that know their node is valid are then\nconverted.\n\nSigned-off-by: Mel Gorman \u003cmel@csn.ul.ie\u003e\nReviewed-by: Christoph Lameter \u003ccl@linux-foundation.org\u003e\nReviewed-by: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nReviewed-by: Pekka Enberg \u003cpenberg@cs.helsinki.fi\u003e\nAcked-by: Paul Mundt \u003clethal@linux-sh.org\u003e\t[for the SLOB NUMA bits]\nCc: Peter Zijlstra \u003ca.p.zijlstra@chello.nl\u003e\nCc: Nick Piggin \u003cnickpiggin@yahoo.com.au\u003e\nCc: Dave Hansen \u003cdave@linux.vnet.ibm.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": "266cf658efcf6ac33541a46740f74f50c79d2b6b", "tree": "5c83b0879892d509e598dfd54be3ba3679ecd348", "parents": [ "03fb3d2af96c2783c3a5bc03f3d984cf422f0e69" ], "author": { "name": "David Howells", "email": "dhowells@redhat.com", "time": "Fri Apr 03 16:42:36 2009 +0100" }, "committer": { "name": "David Howells", "email": "dhowells@redhat.com", "time": "Fri Apr 03 16:42:36 2009 +0100" }, "message": "FS-Cache: Recruit a page flags for cache management\n\nRecruit a page flag to aid in cache management. The following extra flag is\ndefined:\n\n (1) PG_fscache (PG_private_2)\n\n The marked page is backed by a local cache and is pinning resources in the\n cache driver.\n\nIf PG_fscache is set, then things that checked for PG_private will now also\ncheck for that. This includes things like truncation and page invalidation.\nThe function page_has_private() had been added to make the checks for both\nPG_private and PG_private_2 at the same time.\n\nSigned-off-by: David Howells \u003cdhowells@redhat.com\u003e\nAcked-by: Steve Dickson \u003csteved@redhat.com\u003e\nAcked-by: Trond Myklebust \u003cTrond.Myklebust@netapp.com\u003e\nAcked-by: Rik van Riel \u003criel@redhat.com\u003e\nAcked-by: Al Viro \u003cviro@zeniv.linux.org.uk\u003e\nTested-by: Daire Byrne \u003cDaire.Byrne@framestore.com\u003e\n" }, { "commit": "1001c9fb8721ab395e21f571ed2aaa523cdd1e29", "tree": "fc8835db2b1a5fb5b147af4025767d3393bb3a33", "parents": [ "17c9d12e126cb0de8d535dc1908c4819d712bc68" ], "author": { "name": "Daisuke Nishimura", "email": "nishimura@mxp.nes.nec.co.jp", "time": "Wed Feb 11 13:04:18 2009 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Wed Feb 11 14:25:34 2009 -0800" }, "message": "migration: migrate_vmas should check \"vma\"\n\nmigrate_vmas() should check \"vma\" not \"vma-\u003evm_next\" for for-loop condition.\n\nSigned-off-by: Daisuke Nishimura \u003cnishimura@mxp.nes.nec.co.jp\u003e\nCc: Christoph Lameter \u003ccl@linux-foundation.org\u003e\nCc: Johannes Weiner \u003channes@cmpxchg.org\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "938bb9f5e840eddbf54e4f62f6c5ba9b3ae12c9d", "tree": "a25324159ed8cc96b97a4d39aaf228bbd07e3824", "parents": [ "1e7bfb2134dfec37ce04fb3a4ca89299e892d10c" ], "author": { "name": "Heiko Carstens", "email": "heiko.carstens@de.ibm.com", "time": "Wed Jan 14 14:14:30 2009 +0100" }, "committer": { "name": "Heiko Carstens", "email": "heiko.carstens@de.ibm.com", "time": "Wed Jan 14 14:15:30 2009 +0100" }, "message": "[CVE-2009-0029] System call wrappers part 28\n\nSigned-off-by: Heiko Carstens \u003cheiko.carstens@de.ibm.com\u003e\n" }, { "commit": "01b1ae63c2270cbacfd43fea94578c17950eb548", "tree": "ab0275f32e8548c4413014d43cab1f52f03c9c5c", "parents": [ "bced0520fe462bb94021dcabd32e99630c171be2" ], "author": { "name": "KAMEZAWA Hiroyuki", "email": "kamezawa.hiroyu@jp.fujitsu.com", "time": "Wed Jan 07 18:07:50 2009 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Thu Jan 08 08:31:04 2009 -0800" }, "message": "memcg: simple migration handling\n\nNow, management of \"charge\" under page migration is done under following\nmanner. (Assume migrate page contents from oldpage to newpage)\n\n before\n - \"newpage\" is charged before migration.\n at success.\n - \"oldpage\" is uncharged at somewhere(unmap, radix-tree-replace)\n at failure\n - \"newpage\" is uncharged.\n - \"oldpage\" is charged if necessary (*1)\n\nBut (*1) is not reliable....because of GFP_ATOMIC.\n\nThis patch tries to change behavior as following by charge/commit/cancel ops.\n\n before\n - charge PAGE_SIZE (no target page)\n success\n - commit charge against \"newpage\".\n failure\n - commit charge against \"oldpage\".\n (PCG_USED bit works effectively to avoid double-counting)\n - if \"oldpage\" is obsolete, cancel charge of PAGE_SIZE.\n\nSigned-off-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nReviewed-by: Daisuke Nishimura \u003cnishimura@mxp.nes.nec.co.jp\u003e\nCc: Balbir Singh \u003cbalbir@in.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": "7a81b88cb53e335ff7d019e6398c95792c817d93", "tree": "6ebca4d509a541ac707e10f9369916549e90c0ad", "parents": [ "0b82ac37b889ec881b645860da3775118effb3ca" ], "author": { "name": "KAMEZAWA Hiroyuki", "email": "kamezawa.hiroyu@jp.fujitsu.com", "time": "Wed Jan 07 18:07:48 2009 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Thu Jan 08 08:31:04 2009 -0800" }, "message": "memcg: introduce charge-commit-cancel style of functions\n\nThere is a small race in do_swap_page(). When the page swapped-in is\ncharged, the mapcount can be greater than 0. But, at the same time some\nprocess (shares it ) call unmap and make mapcount 1-\u003e0 and the page is\nuncharged.\n\n CPUA \t\t\tCPUB\n mapcount \u003d\u003d 1.\n (1) charge if mapcount\u003d\u003d0 zap_pte_range()\n (2) mapcount 1 \u003d\u003e 0.\n\t\t\t (3) uncharge(). (success)\n (4) set page\u0027s rmap()\n mapcount 0\u003d\u003e1\n\nThen, this swap page\u0027s account is leaked.\n\nFor fixing this, I added a new interface.\n - charge\n account to res_counter by PAGE_SIZE and try to free pages if necessary.\n - commit\n register page_cgroup and add to LRU if necessary.\n - cancel\n uncharge PAGE_SIZE because of do_swap_page failure.\n\n CPUA\n (1) charge (always)\n (2) set page\u0027s rmap (mapcount \u003e 0)\n (3) commit charge was necessary or not after set_pte().\n\nThis protocol uses PCG_USED bit on page_cgroup for avoiding over accounting.\nUsual mem_cgroup_charge_common() does charge -\u003e commit at a time.\n\nAnd this patch also adds following function to clarify all charges.\n\n - mem_cgroup_newpage_charge() ....replacement for mem_cgroup_charge()\n\tcalled against newly allocated anon pages.\n\n - mem_cgroup_charge_migrate_fixup()\n called only from remove_migration_ptes().\n\twe\u0027ll have to rewrite this later.(this patch just keeps old behavior)\n\tThis function will be removed by additional patch to make migration\n\tclearer.\n\nGood for clarifying \"what we do\"\n\nThen, we have 4 following charge points.\n - newpage\n - swap-in\n - add-to-cache.\n - migration.\n\n[akpm@linux-foundation.org: add missing inline directives to stubs]\nSigned-off-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nReviewed-by: Daisuke Nishimura \u003cnishimura@mxp.nes.nec.co.jp\u003e\nCc: Balbir Singh \u003cbalbir@in.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": "6d91add09f4bad5f4d4233b13faa392f0c4b16be", "tree": "26f77047b316dfc0879307fbfda84b15a199155f", "parents": [ "3c1d43787b48c798f44dc32a6e6deb5ca2da3e68" ], "author": { "name": "Hugh Dickins", "email": "hugh@veritas.com", "time": "Tue Jan 06 14:39:24 2009 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Jan 06 15:59:02 2009 -0800" }, "message": "mm: add Set,ClearPageSwapCache stubs\n\nIf we add NOOP stubs for SetPageSwapCache() and ClearPageSwapCache(), then\nwe can remove the #ifdef CONFIG_SWAPs from mm/migrate.c.\n\nSigned-off-by: Hugh Dickins \u003chugh@veritas.com\u003e\nAcked-by: Christoph Lameter \u003ccl@linux-foundation.org\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": "5bd1455c239672081d0e7f086e899b8cbc7a9844", "tree": "0ec4718a425c0bba91344f5be9810593ad4c6b3c", "parents": [ "3140a2273009c01c27d316f35ab76a37e105fdd8" ], "author": { "name": "Brice Goglin", "email": "Brice.Goglin@inria.fr", "time": "Tue Jan 06 14:38:58 2009 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Jan 06 15:58:58 2009 -0800" }, "message": "mm: move_pages: no need to set pp-\u003epage to ZERO_PAGE(0) by default\n\npp-\u003epage is never used when not set to the right page, so there is no need\nto set it to ZERO_PAGE(0) by default.\n\nSigned-off-by: Brice Goglin \u003cBrice.Goglin@inria.fr\u003e\nAcked-by: Christoph Lameter \u003ccl@linux-foundation.org\u003e\nCc: Nick Piggin \u003cnickpiggin@yahoo.com.au\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "3140a2273009c01c27d316f35ab76a37e105fdd8", "tree": "25d4f805dbf72a9491bc146bb77418ef507d21bf", "parents": [ "390722baa7fc447b0a4f0c3c3f537ed056dbc944" ], "author": { "name": "Brice Goglin", "email": "Brice.Goglin@inria.fr", "time": "Tue Jan 06 14:38:57 2009 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Jan 06 15:58:58 2009 -0800" }, "message": "mm: rework do_pages_move() to work on page_sized chunks\n\nRework do_pages_move() to work by page-sized chunks of struct page_to_node\nthat are passed to do_move_page_to_node_array(). We now only have to\nallocate a single page instead a possibly very large vmalloc area to store\nall page_to_node entries.\n\nAs a result, new_page_node() will now have a very small lookup, hidding\nmuch of the overall sys_move_pages() overhead.\n\nSigned-off-by: Brice Goglin \u003cBrice.Goglin@inria.fr\u003e\nSigned-off-by: Nathalie Furmento \u003cNathalie.Furmento@labri.fr\u003e\nAcked-by: Christoph Lameter \u003ccl@linux-foundation.org\u003e\nCc: Nick Piggin \u003cnickpiggin@yahoo.com.au\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "cbacc2c7f066a1e01b33b0e27ae5efbf534bc2db", "tree": "90d1093131d2a3543a8b3b1f3364e7c6f4081a93", "parents": [ "4a6908a3a050aacc9c3a2f36b276b46c0629ad91", "74192246910ff4fb95309ba1a683215644beeb62" ], "author": { "name": "James Morris", "email": "jmorris@namei.org", "time": "Thu Dec 25 11:40:09 2008 +1100" }, "committer": { "name": "James Morris", "email": "jmorris@namei.org", "time": "Thu Dec 25 11:40:09 2008 +1100" }, "message": "Merge branch \u0027next\u0027 into for-linus\n" }, { "commit": "c095adbc211f9f4e990eac7d6cb440de35e4f05f", "tree": "b2da614d48d715816b8ee7172918fa9d2f089a24", "parents": [ "a3dd15444baa9c7522c8457ab564c41219dfb44c" ], "author": { "name": "KOSAKI Motohiro", "email": "kosaki.motohiro@jp.fujitsu.com", "time": "Tue Dec 16 16:06:43 2008 +0900" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Dec 16 08:19:23 2008 -0800" }, "message": "mm: Don\u0027t touch uninitialized variable in do_pages_stat_array()\n\nCommit 80bba1290ab5122c60cdb73332b26d288dc8aedd removed one necessary\nvariable initialization. As a result following warning happened:\n\n CC mm/migrate.o\n mm/migrate.c: In function \u0027sys_move_pages\u0027:\n mm/migrate.c:1001: warning: \u0027err\u0027 may be used uninitialized in this function\n\nMore unfortunately, if find_vma() failed, kernel read uninitialized\nmemory.\n\nSigned-off-by: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nCC: Brice Goglin \u003cBrice.Goglin@inria.fr\u003e\nCc: Christoph Lameter \u003cclameter@sgi.com\u003e\nCc: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nCc: Nick Piggin \u003cnpiggin@suse.de\u003e\nCc: Hugh Dickins \u003chugh@veritas.com\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "80bba1290ab5122c60cdb73332b26d288dc8aedd", "tree": "1a97a6f5070818ffcb3573c1968471110bed3a42", "parents": [ "52b9582dd5983ac888c494bd3e15b5cd40195c53" ], "author": { "name": "Brice Goglin", "email": "Brice.Goglin@inria.fr", "time": "Tue Dec 09 13:14:23 2008 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Wed Dec 10 08:01:53 2008 -0800" }, "message": "mm: no get_user/put_user while holding mmap_sem in do_pages_stat?\n\nSince commit 2f007e74bb85b9fc4eab28524052161703300f1a, do_pages_stat()\ngets the page address from user-space and puts the corresponding status\nback while holding the mmap_sem for read. There is no need to hold\nmmap_sem there while some page-faults may occur.\n\nThis patch adds a temporary address and status buffer so as to only\nhold mmap_sem while working on these kernel buffers. This is\nimplemented by extracting do_pages_stat_array() out of do_pages_stat().\n\nSigned-off-by: Brice Goglin \u003cBrice.Goglin@inria.fr\u003e\nCc: Christoph Lameter \u003cclameter@sgi.com\u003e\nCc: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nCc: 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": "ec98ce480ada787f2cfbd696980ff3564415505b", "tree": "1a4d644b38f9f1e4b4e086fde0b195df4a92cf84", "parents": [ "3496f92beb9aa99ef21fccc154a36c7698e9c538", "feaf3848a813a106f163013af6fcf6c4bfec92d9" ], "author": { "name": "James Morris", "email": "jmorris@namei.org", "time": "Thu Dec 04 17:16:36 2008 +1100" }, "committer": { "name": "James Morris", "email": "jmorris@namei.org", "time": "Thu Dec 04 17:16:36 2008 +1100" }, "message": "Merge branch \u0027master\u0027 into next\n\nConflicts:\n\tfs/nfsd/nfs4recover.c\n\nManually fixed above to use new creds API functions, e.g.\nnfs4_save_creds().\n\nSigned-off-by: James Morris \u003cjmorris@namei.org\u003e\n" }, { "commit": "bda8550deed96687f29992d711a88ea21cff4d26", "tree": "41061a3259d2ed2e19ed4b9e53e41675eb60bd3f", "parents": [ "966c8c12dc9e77f931e2281ba25d2f0244b06949" ], "author": { "name": "Hugh Dickins", "email": "hugh@veritas.com", "time": "Wed Nov 19 15:36:36 2008 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Wed Nov 19 18:49:58 2008 -0800" }, "message": "migration: fix writepage error\n\nPage migration\u0027s writeout() has got understandably confused by the nasty\nAOP_WRITEPAGE_ACTIVATE case: as in normal success, a writepage() error has\nunlocked the page, so writeout() then needs to relock it.\n\nSigned-off-by: Hugh Dickins \u003chugh@veritas.com\u003e\nCc: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nCc: Christoph Lameter \u003ccl@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": "2b828925652340277a889cbc11b2d0637f7cdaf7", "tree": "32fcb3d3e466fc419fad2d3717956a5b5ad3d35a", "parents": [ "3a3b7ce9336952ea7b9564d976d068a238976c9d", "58e20d8d344b0ee083febb18c2b021d2427e56ca" ], "author": { "name": "James Morris", "email": "jmorris@namei.org", "time": "Fri Nov 14 11:29:12 2008 +1100" }, "committer": { "name": "James Morris", "email": "jmorris@namei.org", "time": "Fri Nov 14 11:29:12 2008 +1100" }, "message": "Merge branch \u0027master\u0027 into next\n\nConflicts:\n\tsecurity/keys/internal.h\n\tsecurity/keys/process_keys.c\n\tsecurity/keys/request_key.c\n\nFixed conflicts above by using the non \u0027tsk\u0027 versions.\n\nSigned-off-by: James Morris \u003cjmorris@namei.org\u003e\n" }, { "commit": "c69e8d9c01db2adc503464993c358901c9af9de4", "tree": "bed94aaa9aeb7a7834d1c880f72b62a11a752c78", "parents": [ "86a264abe542cfececb4df129bc45a0338d8cdb9" ], "author": { "name": "David Howells", "email": "dhowells@redhat.com", "time": "Fri Nov 14 10:39:19 2008 +1100" }, "committer": { "name": "James Morris", "email": "jmorris@namei.org", "time": "Fri Nov 14 10:39:19 2008 +1100" }, "message": "CRED: Use RCU to access another task\u0027s creds and to release a task\u0027s own creds\n\nUse RCU to access another task\u0027s creds and to release a task\u0027s own creds.\nThis means that it will be possible for the credentials of a task to be\nreplaced without another task (a) requiring a full lock to read them, and (b)\nseeing deallocated memory.\n\nSigned-off-by: David Howells \u003cdhowells@redhat.com\u003e\nAcked-by: James Morris \u003cjmorris@namei.org\u003e\nAcked-by: Serge Hallyn \u003cserue@us.ibm.com\u003e\nSigned-off-by: James Morris \u003cjmorris@namei.org\u003e\n" }, { "commit": "b6dff3ec5e116e3af6f537d4caedcad6b9e5082a", "tree": "9e76f972eb7ce9b84e0146c8e4126a3f86acb428", "parents": [ "15a2460ed0af7538ca8e6c610fe607a2cd9da142" ], "author": { "name": "David Howells", "email": "dhowells@redhat.com", "time": "Fri Nov 14 10:39:16 2008 +1100" }, "committer": { "name": "James Morris", "email": "jmorris@namei.org", "time": "Fri Nov 14 10:39:16 2008 +1100" }, "message": "CRED: Separate task security context from task_struct\n\nSeparate the task security context from task_struct. At this point, the\nsecurity data is temporarily embedded in the task_struct with two pointers\npointing to it.\n\nNote that the Alpha arch is altered as it refers to (E)UID and (E)GID in\nentry.S via asm-offsets.\n\nWith comment fixes Signed-off-by: Marc Dionne \u003cmarc.c.dionne@gmail.com\u003e\n\nSigned-off-by: David Howells \u003cdhowells@redhat.com\u003e\nAcked-by: James Morris \u003cjmorris@namei.org\u003e\nAcked-by: Serge Hallyn \u003cserue@us.ibm.com\u003e\nSigned-off-by: James Morris \u003cjmorris@namei.org\u003e\n" }, { "commit": "76aac0e9a17742e60d408be1a706e9aaad370891", "tree": "e873a000d9c96209726e0958e311f005c13b2ed5", "parents": [ "b103c59883f1ec6e4d548b25054608cb5724453c" ], "author": { "name": "David Howells", "email": "dhowells@redhat.com", "time": "Fri Nov 14 10:39:12 2008 +1100" }, "committer": { "name": "James Morris", "email": "jmorris@namei.org", "time": "Fri Nov 14 10:39:12 2008 +1100" }, "message": "CRED: Wrap task credential accesses in the core kernel\n\nWrap access to task credentials so that they can be separated more easily from\nthe task_struct during the introduction of COW creds.\n\nChange most current-\u003e(|e|s|fs)[ug]id to current_(|e|s|fs)[ug]id().\n\nChange some task-\u003ee?[ug]id to task_e?[ug]id(). In some places it makes more\nsense to use RCU directly rather than a convenient wrapper; these will be\naddressed by later patches.\n\nSigned-off-by: David Howells \u003cdhowells@redhat.com\u003e\nReviewed-by: James Morris \u003cjmorris@namei.org\u003e\nAcked-by: Serge Hallyn \u003cserue@us.ibm.com\u003e\nCc: Al Viro \u003cviro@zeniv.linux.org.uk\u003e\nCc: linux-audit@redhat.com\nCc: containers@lists.linux-foundation.org\nCc: linux-mm@kvack.org\nSigned-off-by: James Morris \u003cjmorris@namei.org\u003e\n" }, { "commit": "0aedadf91a70a11c4a3e7c7d99b21e5528af8d5d", "tree": "9e2529fa79ff4134f99772b5ed3693316e2221a5", "parents": [ "17a1217e12d8c8434f8a3deef7bf980c724a6ac7" ], "author": { "name": "Christoph Lameter", "email": "cl@linux-foundation.org", "time": "Thu Nov 06 12:53:30 2008 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Thu Nov 06 15:41:18 2008 -0800" }, "message": "mm: move migrate_prep out from under mmap_sem\n\nMove the migrate_prep outside the mmap_sem for the following system calls\n\n1. sys_move_pages\n2. sys_migrate_pages\n3. sys_mbind()\n\nIt really does not matter when we flush the lru. The system is free to\nadd pages onto the lru even during migration which will make the page\nmigration either skip the page (mbind, migrate_pages) or return a busy\nstate (move_pages).\n\nFixes this lockdep warning (and potential deadlock):\n\nSome VM place has\n mmap_sem -\u003e kevent_wq via lru_add_drain_all()\n\nnet/core/dev.c::dev_ioctl() has\n rtnl_lock -\u003e mmap_sem (*) the ioctl has copy_from_user() and it can do page fault.\n\nlinkwatch_event has\n kevent_wq -\u003e rtnl_lock\n\nSigned-off-by: Christoph Lameter \u003ccl@linux-foundation.org\u003e\nCc: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nReported-by: Heiko Carstens \u003cheiko.carstens@de.ibm.com\u003e\nCc: Nick Piggin \u003cnickpiggin@yahoo.com.au\u003e\nCc: Hugh Dickins \u003chugh@veritas.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": "b7abea9630bc8ffc663a751e46680db25c4cdf8d", "tree": "b37d5ba073ccea31328812c74598872d49a85735", "parents": [ "073e587ec2cc377867e53d8b8959738a8e16cff6" ], "author": { "name": "KAMEZAWA Hiroyuki", "email": "kamezawa.hiroyu@jp.fujitsu.com", "time": "Sat Oct 18 20:28:09 2008 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 20 08:52:38 2008 -0700" }, "message": "memcg: make page-\u003emapping NULL before uncharge\n\nThis patch tries to make page-\u003emapping to be NULL before\nmem_cgroup_uncharge_cache_page() is called.\n\n\"page-\u003emapping \u003d\u003d NULL\" is a good check for \"whether the page is still\nradix-tree or not\". This patch also adds BUG_ON() to\nmem_cgroup_uncharge_cache_page();\n\nSigned-off-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nReviewed-by: 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": "5e9a0f023bee02bfb94e08590d998660c01f5a49", "tree": "3cd2131f12a09cc9c84c31f99375256148e400fd", "parents": [ "2f007e74bb85b9fc4eab28524052161703300f1a" ], "author": { "name": "Brice Goglin", "email": "Brice.Goglin@inria.fr", "time": "Sat Oct 18 20:27:17 2008 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 20 08:52:33 2008 -0700" }, "message": "mm: extract do_pages_move() out of sys_move_pages()\n\nTo prepare the chunking, move the sys_move_pages() code that is used when\nnodes!\u003dNULL into do_pages_move(). And rename do_move_pages() into\ndo_move_page_to_node_array().\n\nSigned-off-by: Brice Goglin \u003cBrice.Goglin@inria.fr\u003e\nAcked-by: Christoph Lameter \u003ccl@linux-foundation.org\u003e\nCc: Nick Piggin \u003cnickpiggin@yahoo.com.au\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "2f007e74bb85b9fc4eab28524052161703300f1a", "tree": "8fa77e687aa5fd807767484bdafcce86e46a56af", "parents": [ "e78bbfa8262424417a29349a8064a535053912b9" ], "author": { "name": "Brice Goglin", "email": "Brice.Goglin@inria.fr", "time": "Sat Oct 18 20:27:16 2008 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 20 08:52:33 2008 -0700" }, "message": "mm: don\u0027t vmalloc a huge page_to_node array for do_pages_stat()\n\ndo_pages_stat() does not need any page_to_node entry for real. Just pass\nthe pointers to the user-space page address array and to the user-space\nstatus array, and have do_pages_stat() traverse the former and fill the\nlatter directly.\n\nSigned-off-by: Brice Goglin \u003cBrice.Goglin@inria.fr\u003e\nAcked-by: Christoph Lameter \u003ccl@linux-foundation.org\u003e\nCc: Nick Piggin \u003cnickpiggin@yahoo.com.au\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "e78bbfa8262424417a29349a8064a535053912b9", "tree": "dc1f1cdd4390b3f817a2d3a2835c11eb3b41b3ea", "parents": [ "de7f0cba96786cf9ec9da4532c1b25f733da9b6f" ], "author": { "name": "Brice Goglin", "email": "Brice.Goglin@inria.fr", "time": "Sat Oct 18 20:27:15 2008 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 20 08:52:33 2008 -0700" }, "message": "mm: stop returning -ENOENT from sys_move_pages() if nothing got migrated\n\nA patchset reworking sys_move_pages(). It removes the possibly large\nvmalloc by using multiple chunks when migrating large buffers. It also\ndramatically increases the throughput for large buffers since the lookup\nin new_page_node() is now limited to a single chunk, causing the quadratic\ncomplexity to have a much slower impact. There is no need to use any\nradix-tree-like structure to improve this lookup.\n\nsys_move_pages() duration on a 4-quadcore-opteron 2347HE (1.9Gz),\nmigrating between nodes #2 and #3:\n\n\tlength\t\tmove_pages (us)\t\tmove_pages+patch (us)\n\t4kB\t\t126\t\t\t98\n\t40kB\t\t198\t\t\t168\n\t400kB\t\t963\t\t\t937\n\t4MB\t\t12503\t\t\t11930\n\t40MB\t\t246867\t\t\t11848\n\nPatches #1 and #4 are the important ones:\n1) stop returning -ENOENT from sys_move_pages() if nothing got migrated\n2) don\u0027t vmalloc a huge page_to_node array for do_pages_stat()\n3) extract do_pages_move() out of sys_move_pages()\n4) rework do_pages_move() to work on page_sized chunks\n5) move_pages: no need to set pp-\u003epage to ZERO_PAGE(0) by default\n\nThis patch:\n\nThere is no point in returning -ENOENT from sys_move_pages() if all pages\nwere already on the right node, while we return 0 if only 1 page was not.\nMost application don\u0027t know where their pages are allocated, so it\u0027s not\nan error to try to migrate them anyway.\n\nJust return 0 and let the status array in user-space be checked if the\napplication needs details.\n\nIt will make the upcoming chunked-move_pages() support much easier.\n\nSigned-off-by: Brice Goglin \u003cBrice.Goglin@inria.fr\u003e\nAcked-by: Christoph Lameter \u003ccl@linux-foundation.org\u003e\nCc: Nick Piggin \u003cnickpiggin@yahoo.com.au\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": "894bc310419ac95f4fa4142dc364401a7e607f65", "tree": "15d56a7333b41620016b845d2323dd06e822b621", "parents": [ "8a7a8544a4f6554ec2d8048ac9f9672f442db5a2" ], "author": { "name": "Lee Schermerhorn", "email": "Lee.Schermerhorn@hp.com", "time": "Sat Oct 18 20:26:39 2008 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 20 08:50:26 2008 -0700" }, "message": "Unevictable LRU Infrastructure\n\nWhen the system contains lots of mlocked or otherwise unevictable pages,\nthe pageout code (kswapd) can spend lots of time scanning over these\npages. Worse still, the presence of lots of unevictable pages can confuse\nkswapd into thinking that more aggressive pageout modes are required,\nresulting in all kinds of bad behaviour.\n\nInfrastructure to manage pages excluded from reclaim--i.e., hidden from\nvmscan. Based on a patch by Larry Woodman of Red Hat. Reworked to\nmaintain \"unevictable\" pages on a separate per-zone LRU list, to \"hide\"\nthem from vmscan.\n\nKosaki Motohiro added the support for the memory controller unevictable\nlru list.\n\nPages on the unevictable list have both PG_unevictable and PG_lru set.\nThus, PG_unevictable is analogous to and mutually exclusive with\nPG_active--it specifies which LRU list the page is on.\n\nThe unevictable infrastructure is enabled by a new mm Kconfig option\n[CONFIG_]UNEVICTABLE_LRU.\n\nA new function \u0027page_evictable(page, vma)\u0027 in vmscan.c tests whether or\nnot a page may be evictable. Subsequent patches will add the various\n!evictable tests. We\u0027ll want to keep these tests light-weight for use in\nshrink_active_list() and, possibly, the fault path.\n\nTo avoid races between tasks putting pages [back] onto an LRU list and\ntasks that might be moving the page from non-evictable to evictable state,\nthe new function \u0027putback_lru_page()\u0027 -- inverse to \u0027isolate_lru_page()\u0027\n-- tests the \"evictability\" of a page after placing it on the LRU, before\ndropping the reference. If the page has become unevictable,\nputback_lru_page() will redo the \u0027putback\u0027, thus moving the page to the\nunevictable list. This way, we avoid \"stranding\" evictable pages on the\nunevictable list.\n\n[akpm@linux-foundation.org: fix fallout from out-of-order merge]\n[riel@redhat.com: fix UNEVICTABLE_LRU and !PROC_PAGE_MONITOR build]\n[nishimura@mxp.nes.nec.co.jp: remove redundant mapping check]\n[kosaki.motohiro@jp.fujitsu.com: unevictable-lru-infrastructure: putback_lru_page()/unevictable page handling rework]\n[kosaki.motohiro@jp.fujitsu.com: kill unnecessary lock_page() in vmscan.c]\n[kosaki.motohiro@jp.fujitsu.com: revert migration change of unevictable lru infrastructure]\n[kosaki.motohiro@jp.fujitsu.com: revert to unevictable-lru-infrastructure-kconfig-fix.patch]\n[kosaki.motohiro@jp.fujitsu.com: restore patch failure of vmstat-unevictable-and-mlocked-pages-vm-events.patch]\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\nDebugged-by: Benjamin Kidwell \u003cbenjkidwell@yahoo.com\u003e\nSigned-off-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": "b2e185384f534781fd22f5ce170b2ad26f97df70", "tree": "3096b8250302c5a9f71b1b5122345f7cf62606cc", "parents": [ "68a22394c286a2daf06ee8d65d8835f738faefa5" ], "author": { "name": "Rik van Riel", "email": "riel@redhat.com", "time": "Sat Oct 18 20:26:30 2008 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 20 08:50:25 2008 -0700" }, "message": "define page_file_cache() function\n\nDefine page_file_cache() function to answer the question:\n\tis page backed by a file?\n\nOriginally part of Rik van Riel\u0027s split-lru patch. Extracted to make\navailable for other, independent reclaim patches.\n\nMoved inline function to linux/mm_inline.h where it will be needed by\nsubsequent \"split LRU\" and \"noreclaim\" patches.\n\nUnfortunately this needs to use a page flag, since the PG_swapbacked state\nneeds to be preserved all the way to the point where the page is last\nremoved from the LRU. Trying to derive the status from other info in the\npage resulted in wrong VM statistics in earlier split VM patchsets.\n\nThe total number of page flags in use on a 32 bit machine after this patch\nis 19.\n\n[akpm@linux-foundation.org: fix up out-of-order merge fallout]\n[hugh@veritas.com: splitlru: shmem_getpage SetPageSwapBacked sooner[\nSigned-off-by: Rik van Riel \u003criel@redhat.com\u003e\nSigned-off-by: Lee Schermerhorn \u003clee.schermerhorn@hp.com\u003e\nSigned-off-by: MinChan Kim \u003cminchan.kim@gmail.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": "f04e9ebbe4909f9a41efd55149bc353299f4e83b", "tree": "4ff31c7f918edafe7d4e4dd0e926b6ac545c7897", "parents": [ "b69408e88bd86b98feb7b9a38fd865e1ddb29827" ], "author": { "name": "KOSAKI Motohiro", "email": "kosaki.motohiro@jp.fujitsu.com", "time": "Sat Oct 18 20:26:19 2008 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 20 08:50:25 2008 -0700" }, "message": "swap: use an array for the LRU pagevecs\n\nTurn the pagevecs into an array just like the LRUs. This significantly\ncleans up the source code and reduces the size of the kernel by about 13kB\nafter all the LRU lists have been created further down in the split VM\npatch series.\n\nSigned-off-by: Rik van Riel \u003criel@redhat.com\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": "62695a84eb8f2e718bf4dfb21700afaa7a08e0ea", "tree": "0af7bac599748a7e462bff16d70c702c9e33a2fb", "parents": [ "71088785c6bc68fddb450063d57b1bd1c78e0ea1" ], "author": { "name": "Nick Piggin", "email": "npiggin@suse.de", "time": "Sat Oct 18 20:26:09 2008 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 20 08:50:25 2008 -0700" }, "message": "vmscan: move isolate_lru_page() to vmscan.c\n\nOn large memory systems, the VM can spend way too much time scanning\nthrough pages that it cannot (or should not) evict from memory. Not only\ndoes it use up CPU time, but it also provokes lock contention and can\nleave large systems under memory presure in a catatonic state.\n\nThis patch series improves VM scalability by:\n\n1) putting filesystem backed, swap backed and unevictable pages\n onto their own LRUs, so the system only scans the pages that it\n can/should evict from memory\n\n2) switching to two handed clock replacement for the anonymous LRUs,\n so the number of pages that need to be scanned when the system\n starts swapping is bound to a reasonable number\n\n3) keeping unevictable pages off the LRU completely, so the\n VM does not waste CPU time scanning them. ramfs, ramdisk,\n SHM_LOCKED shared memory segments and mlock()ed VMA pages\n are keept on the unevictable list.\n\nThis patch:\n\nisolate_lru_page logically belongs to be in vmscan.c than migrate.c.\n\nIt is tough, because we don\u0027t need that function without memory migration\nso there is a valid argument to have it in migrate.c. However a\nsubsequent patch needs to make use of it in the core mm, so we can happily\nmove it to vmscan.c.\n\nAlso, make the function a little more generic by not requiring that it\nadds an isolated page to a given list. Callers can do that.\n\n\tNote that we now have \u0027__isolate_lru_page()\u0027, that does\n\tsomething quite different, visible outside of vmscan.c\n\tfor use with memory controller. Methinks we need to\n\trationalize these names/purposes.\t--lts\n\n[akpm@linux-foundation.org: fix mm/memory_hotplug.c build]\nSigned-off-by: Nick Piggin \u003cnpiggin@suse.de\u003e\nSigned-off-by: Rik van Riel \u003criel@redhat.com\u003e\nSigned-off-by: 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": "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": "19fd6231279be3c3bdd02ed99f9b0eb195978064", "tree": "ee09121054262d73c551b57114acd855b82a7a82", "parents": [ "a60637c85893e7191faaafa6a72e197c24386727" ], "author": { "name": "Nick Piggin", "email": "npiggin@suse.de", "time": "Fri Jul 25 19:45:32 2008 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Sat Jul 26 12:00:06 2008 -0700" }, "message": "mm: spinlock tree_lock\n\nmapping-\u003etree_lock has no read lockers. convert the lock from an rwlock\nto a spinlock.\n\nSigned-off-by: Nick Piggin \u003cnpiggin@suse.de\u003e\nCc: Benjamin Herrenschmidt \u003cbenh@kernel.crashing.org\u003e\nCc: Paul Mackerras \u003cpaulus@samba.org\u003e\nCc: Hugh Dickins \u003chugh@veritas.com\u003e\nCc: \"Paul E. McKenney\" \u003cpaulmck@us.ibm.com\u003e\nReviewed-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": "e286781d5f2e9c846e012a39653a166e9d31777d", "tree": "14958fe6d8f3e0459c96c68b3034ea2433ab85ac", "parents": [ "47feff2c8eefe85099f87c43d3096855f0085ca0" ], "author": { "name": "Nick Piggin", "email": "npiggin@suse.de", "time": "Fri Jul 25 19:45:30 2008 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Sat Jul 26 12:00:06 2008 -0700" }, "message": "mm: speculative page references\n\nIf we can be sure that elevating the page_count on a pagecache page will\npin it, we can speculatively run this operation, and subsequently check to\nsee if we hit the right page rather than relying on holding a lock or\notherwise pinning a reference to the page.\n\nThis can be done if get_page/put_page behaves consistently throughout the\nwhole tree (ie. if we \"get\" the page after it has been used for something\nelse, we must be able to free it with a put_page).\n\nActually, there is a period where the count behaves differently: when the\npage is free or if it is a constituent page of a compound page. We need\nan atomic_inc_not_zero operation to ensure we don\u0027t try to grab the page\nin either case.\n\nThis patch introduces the core locking protocol to the pagecache (ie.\nadds page_cache_get_speculative, and tweaks some update-side code to make\nit work).\n\nThanks to Hugh for pointing out an improvement to the algorithm setting\npage_count to zero when we have control of all references, in order to\nhold off speculative getters.\n\n[kamezawa.hiroyu@jp.fujitsu.com: fix migration_entry_wait()]\n[hugh@veritas.com: fix add_to_page_cache]\n[akpm@linux-foundation.org: repair a comment]\nSigned-off-by: Nick Piggin \u003cnpiggin@suse.de\u003e\nCc: Jeff Garzik \u003cjeff@garzik.org\u003e\nCc: Benjamin Herrenschmidt \u003cbenh@kernel.crashing.org\u003e\nCc: Paul Mackerras \u003cpaulus@samba.org\u003e\nCc: Hugh Dickins \u003chugh@veritas.com\u003e\nCc: \"Paul E. McKenney\" \u003cpaulmck@us.ibm.com\u003e\nReviewed-by: Peter Zijlstra \u003ca.p.zijlstra@chello.nl\u003e\nSigned-off-by: Daisuke Nishimura \u003cnishimura@mxp.nes.nec.co.jp\u003e\nSigned-off-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nSigned-off-by: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nSigned-off-by: Hugh Dickins \u003chugh@veritas.com\u003e\nAcked-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": "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": "e8589cc189f96b87348ae83ea4db38eaac624135", "tree": "6693422dc81e6da78c4ad892b0d326fb7f946dda", "parents": [ "508b7be0a5b06b64203512ed9b34191cddc83f56" ], "author": { "name": "KAMEZAWA Hiroyuki", "email": "kamezawa.hiroyu@jp.fujitsu.com", "time": "Fri Jul 25 01:47:10 2008 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Fri Jul 25 10:53:37 2008 -0700" }, "message": "memcg: better migration handling\n\nThis patch changes page migration under memory controller to use a\ndifferent algorithm. (thanks to Christoph for new idea.)\n\nBefore:\n - page_cgroup is migrated from an old page to a new page.\nAfter:\n - a new page is accounted , no reuse of page_cgroup.\n\nPros:\n\n - We can avoid compliated lock depndencies and races in migration.\n\nCons:\n\n - new param to mem_cgroup_charge_common().\n\n - mem_cgroup_getref() is added for handling ref_cnt ping-pong.\n\nThis version simplifies complicated lock dependency in page migraiton\nunder memory resource controller.\n\n new refcnt sequence is following.\n\na mapped page:\n prepage_migration() ..... +1 to NEW page\n try_to_unmap() ..... all refs to OLD page is gone.\n move_pages() ..... +1 to NEW page if page cache.\n remap... ..... all refs from *map* is added to NEW one.\n end_migration() ..... -1 to New page.\n\n page\u0027s mapcount + (page_is_cache) refs are added to NEW one.\n\nSigned-off-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nCc: Balbir Singh \u003cbalbir@in.ibm.com\u003e\nCc: Pavel Emelyanov \u003cxemul@openvz.org\u003e\nCc: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nCc: YAMAMOTO Takashi \u003cyamamoto@valinux.co.jp\u003e\nCc: Hugh Dickins \u003chugh@veritas.com\u003e\nCc: Christoph Lameter \u003ccl@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": "83d1674a946141c3c59d430e96c224f7937e6158", "tree": "03420c9fdf56ad35de685b7c0b48899d886bd7ff", "parents": [ "9ca908f47bc784c90e17a553ce33e756c73feac4" ], "author": { "name": "Gerald Schaefer", "email": "gerald.schaefer@de.ibm.com", "time": "Wed Jul 23 21:28:22 2008 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Thu Jul 24 10:47:21 2008 -0700" }, "message": "mm: make CONFIG_MIGRATION available w/o CONFIG_NUMA\n\nWe\u0027d like to support CONFIG_MEMORY_HOTREMOVE on s390, which depends on\nCONFIG_MIGRATION. So far, CONFIG_MIGRATION is only available with NUMA\nsupport.\n\nThis patch makes CONFIG_MIGRATION selectable for architectures that define\nARCH_ENABLE_MEMORY_HOTREMOVE. When MIGRATION is enabled w/o NUMA, the\nkernel won\u0027t compile because migrate_vmas() does not know about\nvm_ops-\u003emigrate() and vma_migratable() does not know about policy_zone.\nTo fix this, those two functions can be restricted to \u0027#ifdef CONFIG_NUMA\u0027\nbecause they are not being used w/o NUMA. vma_migratable() is moved over\nfrom migrate.h to mempolicy.h.\n\n[kosaki.motohiro@jp.fujitsu.com: build fix]\nAcked-by: Christoph Lameter \u003ccl@linux-foundation.org\u003e\nSigned-off-by: Gerald Schaefer \u003cgerald.schaefer@de.ibm.com\u003e\nCc: Martin Schwidefsky \u003cschwidefsky@de.ibm.com\u003e\nCc: Heiko Carstens \u003cheiko.carstens@de.ibm.com\u003e\nSigned-off-by: KOSAKI Motorhiro \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": "4f5ca265788973e3f5a1129a96ee4a9cbf587f2b", "tree": "68d99bd13f654286b2d5684ad0ea175a98d91f1a", "parents": [ "e4048e5dc4aecec670f48ed007a28779f09cebd6" ], "author": { "name": "Adrian Bunk", "email": "bunk@kernel.org", "time": "Wed Jul 23 21:27:02 2008 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Thu Jul 24 10:47:14 2008 -0700" }, "message": "mm/migrate.c should #include \u003clinux/syscalls.h\u003e\n\nEvery file should include the headers containing the externs for its\nglobal functions (in this case for sys_move_pages()).\n\nSigned-off-by: Adrian Bunk \u003cbunk@kernel.org\u003e\nAcked-by: Christoph Lameter \u003ccl@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": "cde53535991fbb5c34a1566f25955297c1487b8d", "tree": "4f87e67b52c8761cfc421a619379263733b91159", "parents": [ "a926c063738f31c8c8b5c2b883812a40e7868072" ], "author": { "name": "Christoph Lameter", "email": "clameter@sgi.com", "time": "Fri Jul 04 09:59:22 2008 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Fri Jul 04 10:40:04 2008 -0700" }, "message": "Christoph has moved\n\nRemove all clameter@sgi.com addresses from the kernel tree since they will\nbecome invalid on June 27th. Change my maintainer email address for the\nslab allocators to cl@linux-foundation.org (which will be the new email\naddress for the future).\n\nSigned-off-by: Christoph Lameter \u003cclameter@sgi.com\u003e\nSigned-off-by: Christoph Lameter \u003ccl@linux-foundation.org\u003e\nCc: Pekka Enberg \u003cpenberg@cs.helsinki.fi\u003e\nCc: Stephen Rothwell \u003csfr@canb.auug.org.au\u003e\nCc: Matt Mackall \u003cmpm@selenic.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "89f5b7da2a6bad2e84670422ab8192382a5aeb9f", "tree": "4f55cf9ef8a76d4b9a960e1b443ed015e63e713f", "parents": [ "9bedbcb207ed9a571b239231d99c8fd4a34ae24d" ], "author": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Fri Jun 20 11:18:25 2008 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Fri Jun 20 11:18:25 2008 -0700" }, "message": "Reinstate ZERO_PAGE optimization in \u0027get_user_pages()\u0027 and fix XIP\n\nKAMEZAWA Hiroyuki and Oleg Nesterov point out that since the commit\n557ed1fa2620dc119adb86b34c614e152a629a80 (\"remove ZERO_PAGE\") removed\nthe ZERO_PAGE from the VM mappings, any users of get_user_pages() will\ngenerally now populate the VM with real empty pages needlessly.\n\nWe used to get the ZERO_PAGE when we did the \"handle_mm_fault()\", but\nsince fault handling no longer uses ZERO_PAGE for new anonymous pages,\nwe now need to handle that special case in follow_page() instead.\n\nIn particular, the removal of ZERO_PAGE effectively removed the core\nfile writing optimization where we would skip writing pages that had not\nbeen populated at all, and increased memory pressure a lot by allocating\nall those useless newly zeroed pages.\n\nThis reinstates the optimization by making the unmapped PTE case the\nsame as for a non-existent page table, which already did this correctly.\n\nWhile at it, this also fixes the XIP case for follow_page(), where the\ncaller could not differentiate between the case of a page that simply\ncould not be used (because it had no \"struct page\" associated with it)\nand a page that just wasn\u0027t mapped.\n\nWe do that by simply returning an error pointer for pages that could not\nbe turned into a \"struct page *\". The error is arbitrarily picked to be\nEFAULT, since that was what get_user_pages() already used for the\nequivalent IO-mapped page case.\n\n[ Also removed an impossible test for pte_offset_map_lock() failing:\n that\u0027s not how that function works ]\n\nAcked-by: Oleg Nesterov \u003coleg@tv-sign.ru\u003e\nAcked-by: Nick Piggin \u003cnpiggin@suse.de\u003e\nCc: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nCc: Hugh Dickins \u003chugh@veritas.com\u003e\nCc: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nCc: Ingo Molnar \u003cmingo@elte.hu\u003e\nCc: Roland McGrath \u003croland@redhat.com\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "3a902c5f6851cd0b64c33efaa3bd57aa27a82efb", "tree": "9803f7bdc847ed8cd5192816d9ca0ee9e310cd60", "parents": [ "969a19f1c405a8e9d15ceb9e75e3f4a321aaf56f" ], "author": { "name": "Nick Piggin", "email": "npiggin@suse.de", "time": "Wed Apr 30 00:55:16 2008 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Wed Apr 30 08:29:55 2008 -0700" }, "message": "mm: fix warning on memory offline\n\nKAMEZAWA Hiroyuki found a warning message in the buffer dirtying code that\nis coming from page migration caller.\n\nWARNING: at fs/buffer.c:720 __set_page_dirty+0x330/0x360()\nCall Trace:\n [\u003ca000000100015220\u003e] show_stack+0x80/0xa0\n [\u003ca000000100015270\u003e] dump_stack+0x30/0x60\n [\u003ca000000100089ed0\u003e] warn_on_slowpath+0x90/0xe0\n [\u003ca0000001001f8b10\u003e] __set_page_dirty+0x330/0x360\n [\u003ca0000001001ffb90\u003e] __set_page_dirty_buffers+0xd0/0x280\n [\u003ca00000010012fec0\u003e] set_page_dirty+0xc0/0x260\n [\u003ca000000100195670\u003e] migrate_page_copy+0x5d0/0x5e0\n [\u003ca000000100197840\u003e] buffer_migrate_page+0x2e0/0x3c0\n [\u003ca000000100195eb0\u003e] migrate_pages+0x770/0xe00\n\nWhat was happening is that migrate_page_copy wants to transfer the PG_dirty\nbit from old page to new page, so what it would do is set_page_dirty(newpage).\nHowever set_page_dirty() is used to set the entire page dirty, wheras in\nthis case, only part of the page was dirty, and it also was not uptodate.\n\nMarking the whole page dirty with set_page_dirty would lead to corruption or\nunresolvable conditions -- a dirty \u0026\u0026 !uptodate page and dirty \u0026\u0026 !uptodate\nbuffers.\n\nPossibly we could just ClearPageDirty(oldpage); SetPageDirty(newpage);\nhowever in the interests of keeping the change minimal...\n\nSigned-off-by: Nick Piggin \u003cnpiggin@suse.de\u003e\nTested-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": "98837c7f82ef78aa38f40462aa2fcac68fd3acbf", "tree": "6d76841b18b57a9202d7699ba4dca5b39fdd7aea", "parents": [ "61469f1d51777fc3b6d8d70da8373ee77ee13349" ], "author": { "name": "Hugh Dickins", "email": "hugh@veritas.com", "time": "Tue Mar 04 14:29:06 2008 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@woody.linux-foundation.org", "time": "Tue Mar 04 16:35:14 2008 -0800" }, "message": "memcg: fix VM_BUG_ON from page migration\n\nPage migration gave me free_hot_cold_page\u0027s VM_BUG_ON page-\u003epage_cgroup.\nremove_migration_pte was calling mem_cgroup_charge on the new page whenever it\nfound a swap pte, before it had determined it to be a migration entry. That\nleft a surplus reference count on the page_cgroup, so it was still attached\nwhen the page was later freed.\n\nMove that mem_cgroup_charge down to where we\u0027re sure it\u0027s a migration entry.\nWe were already under i_mmap_lock or anon_vma-\u003elock, so its GFP_KERNEL was\nalready inappropriate: change that to GFP_ATOMIC.\n\nIt\u0027s essential that remove_migration_pte removes all the migration entries,\nother crashes follow if not. So proceed even when the charge fails: normally\nit cannot, but after a mem_cgroup_force_empty it might - comment in the code.\n\nSigned-off-by: Hugh Dickins \u003chugh@veritas.com\u003e\nCc: David Rientjes \u003crientjes@google.com\u003e\nCc: 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": "ae41be374293e70e1ed441d986afcc6e744ef9d9", "tree": "d8e2143820bbf3ed2f1f79ed99ee430284567b93", "parents": [ "9175e0311ec9e6d1bf1f6dfecf9268baf08765e6" ], "author": { "name": "KAMEZAWA Hiroyuki", "email": "kamezawa.hiroyu@jp.fujitsu.com", "time": "Thu Feb 07 00:14:10 2008 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@woody.linux-foundation.org", "time": "Thu Feb 07 08:42:19 2008 -0800" }, "message": "bugfix for memory cgroup controller: migration under memory controller fix\n\nWhile using memory control cgroup, page-migration under it works as following.\n\u003d\u003d\n 1. uncharge all refs at try to unmap.\n 2. charge regs again remove_migration_ptes()\n\u003d\u003d\nThis is simple but has following problems.\n\u003d\u003d\n The page is uncharged and charged back again if *mapped*.\n - This means that cgroup before migration can be different from one after\n migration\n - If page is not mapped but charged as page cache, charge is just ignored\n (because not mapped, it will not be uncharged before migration)\n This is memory leak.\n\u003d\u003d\nThis patch tries to keep memory cgroup at page migration by increasing\none refcnt during it. 3 functions are added.\n\n mem_cgroup_prepare_migration() --- increase refcnt of page-\u003epage_cgroup\n mem_cgroup_end_migration() --- decrease refcnt of page-\u003epage_cgroup\n mem_cgroup_page_migration() --- copy page-\u003epage_cgroup from old page to\n new page.\n\nDuring migration\n - old page is under PG_locked.\n - new page is under PG_locked, too.\n - both old page and new page is not on LRU.\n\nThese 3 facts guarantee that page_cgroup() migration has no race.\n\nTested and worked well in x86_64/fake-NUMA box.\n\nSigned-off-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nCc: 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": "e1a1cd590e3fcb0d2e230128daf2337ea55387dc", "tree": "eb660ab340c657a1eb595b2d4d8e8b62783bf6fb", "parents": [ "bed7161a519a2faef53e1bce1b47595e297c1d14" ], "author": { "name": "Balbir Singh", "email": "balbir@linux.vnet.ibm.com", "time": "Thu Feb 07 00:14:02 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 charging gfp mask aware\n\nNick Piggin pointed out that swap cache and page cache addition routines\ncould be called from non GFP_KERNEL contexts. This patch makes the\ncharging routine aware of the gfp context. Charging might fail if the\ncgroup is over it\u0027s limit, in which case a suitable error is returned.\n\nThis patch was tested on a Powerpc box. I am still looking at being able\nto test the path, through which allocations happen in non GFP_KERNEL\ncontexts.\n\n[kamezawa.hiroyu@jp.fujitsu.com: problem with ZONE_MOVABLE]\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: 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": "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": "62e1c55300f306e06478f460a7eefba085206e0b", "tree": "be15b2e4801c837c5e20d43b8f29a53c0ba1391c", "parents": [ "7786fa9ac5366214fb942a9e62c6e46b4272c22c" ], "author": { "name": "Shaohua Li", "email": "shaohua.li@intel.com", "time": "Mon Feb 04 22:29:33 2008 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@woody.linux-foundation.org", "time": "Tue Feb 05 09:44:19 2008 -0800" }, "message": "page migraton: handle orphaned pages\n\nOrphaned page might have fs-private metadata, the page is truncated. As\nthe page hasn\u0027t mapping, page migration refuse to migrate the page. It\nappears the page is only freed in page reclaim and if zone watermark is\nlow, the page is never freed, as a result migration always fail. I thought\nwe could free the metadata so such page can be freed in migration and make\nmigration more reliable.\n\n[akpm@linux-foundation.org: go direct to try_to_free_buffers()]\nSigned-off-by: Shaohua Li \u003cshaohua.li@intel.com\u003e\nAcked-by: Nick Piggin \u003cnpiggin@suse.de\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": "698dd4ba6b12e34e1e432c944c01478c0b2cd773", "tree": "fe524e3ae12b54968b363314ad45841abbd55d98", "parents": [ "824552574162ac00ae636fa41386b1072379ea4a" ], "author": { "name": "Matt Mackall", "email": "mpm@selenic.com", "time": "Mon Feb 04 22:29:00 2008 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@woody.linux-foundation.org", "time": "Tue Feb 05 09:44:16 2008 -0800" }, "message": "maps4: move is_swap_pte\n\nMove is_swap_pte helper function to swapops.h for use by pagemap code\n\nSigned-off-by: Matt Mackall \u003cmpm@selenic.com\u003e\nCc: Dave Hansen \u003chaveblue@us.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": "e9534b3fd7843d1bd5a7a1fe2474a09f72d41ab8", "tree": "90a935afb9962ea5696149c8ca8a11b2fe97b2bd", "parents": [ "88a9b03775cbd5124c91f350b89c0dfb9d6550eb" ], "author": { "name": "Gabriel Craciunescu", "email": "nix.or.die@googlemail.com", "time": "Sat Oct 20 02:13:26 2007 +0200" }, "committer": { "name": "Adrian Bunk", "email": "bunk@kernel.org", "time": "Sat Oct 20 02:13:26 2007 +0200" }, "message": "Typo fixes retrun -\u003e return\n\nTypo fixes retrun -\u003e return\n\nSigned-off-by: Gabriel Craciunescu \u003cnix.or.die@googlemail.com\u003e\nSigned-off-by: Adrian Bunk \u003cbunk@kernel.org\u003e\n" }, { "commit": "228ebcbe634a30aec35132ea4375721bcc41bec0", "tree": "a875976fd5bde6e2f931aa235c34c88a2738493f", "parents": [ "b488893a390edfe027bae7a46e9af8083e740668" ], "author": { "name": "Pavel Emelyanov", "email": "xemul@openvz.org", "time": "Thu Oct 18 23:40:16 2007 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@woody.linux-foundation.org", "time": "Fri Oct 19 11:53:40 2007 -0700" }, "message": "Uninline find_task_by_xxx set of functions\n\nThe find_task_by_something is a set of macros are used to find task by pid\ndepending on what kind of pid is proposed - global or virtual one. All of\nthem are wrappers above the most generic one - find_task_by_pid_type_ns() -\nand just substitute some args for it.\n\nIt turned out, that dereferencing the current-\u003ensproxy-\u003epid_ns construction\nand pushing one more argument on the stack inline cause kernel text size to\ngrow.\n\nThis patch moves all this stuff out-of-line into kernel/pid.c. Together\nwith the next patch it saves a bit less than 400 bytes from the .text\nsection.\n\nSigned-off-by: Pavel Emelyanov \u003cxemul@openvz.org\u003e\nCc: Sukadev Bhattiprolu \u003csukadev@us.ibm.com\u003e\nCc: Oleg Nesterov \u003coleg@tv-sign.ru\u003e\nCc: Paul Menage \u003cmenage@google.com\u003e\nCc: \"Eric W. Biederman\" \u003cebiederm@xmission.com\u003e\nAcked-by: Ingo Molnar \u003cmingo@elte.hu\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "b488893a390edfe027bae7a46e9af8083e740668", "tree": "c469a7f99ad01005a73011c029eb5e5d15454559", "parents": [ "3eb07c8c8adb6f0572baba844ba2d9e501654316" ], "author": { "name": "Pavel Emelyanov", "email": "xemul@openvz.org", "time": "Thu Oct 18 23:40:14 2007 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@woody.linux-foundation.org", "time": "Fri Oct 19 11:53:40 2007 -0700" }, "message": "pid namespaces: changes to show virtual ids to user\n\nThis is the largest patch in the set. Make all (I hope) the places where\nthe pid is shown to or get from user operate on the virtual pids.\n\nThe idea is:\n - all in-kernel data structures must store either struct pid itself\n or the pid\u0027s global nr, obtained with pid_nr() call;\n - when seeking the task from kernel code with the stored id one\n should use find_task_by_pid() call that works with global pids;\n - when showing pid\u0027s numerical value to the user the virtual one\n should be used, but however when one shows task\u0027s pid outside this\n task\u0027s namespace the global one is to be used;\n - when getting the pid from userspace one need to consider this as\n the virtual one and use appropriate task/pid-searching functions.\n\n[akpm@linux-foundation.org: build fix]\n[akpm@linux-foundation.org: nuther build fix]\n[akpm@linux-foundation.org: yet nuther build fix]\n[akpm@linux-foundation.org: remove unneeded casts]\nSigned-off-by: Pavel Emelyanov \u003cxemul@openvz.org\u003e\nSigned-off-by: Alexey Dobriyan \u003cadobriyan@openvz.org\u003e\nCc: Sukadev Bhattiprolu \u003csukadev@us.ibm.com\u003e\nCc: Oleg Nesterov \u003coleg@tv-sign.ru\u003e\nCc: Paul Menage \u003cmenage@google.com\u003e\nCc: \"Eric W. Biederman\" \u003cebiederm@xmission.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": "97ee052461446526e1de7236497e6f1b1ffedf8c", "tree": "7c91270577191ed32de22d8183695c1354d555c8", "parents": [ "4106f83a9f86afc423557d0d92ebf4b3f36728c1" ], "author": { "name": "KAMEZAWA Hiroyuki", "email": "kamezawa.hiroyu@jp.fujitsu.com", "time": "Tue Oct 16 01:25:43 2007 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@woody.linux-foundation.org", "time": "Tue Oct 16 09:42:59 2007 -0700" }, "message": "flush cache before installing new page at migraton\n\nIn migration, a new page should be cache flushed before set_pte() in some\narchs which have virtually-tagged cache.\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": "56bbd65df0e92a4a8eb70c5f2b416ae2b6c5fb31", "tree": "714154b7b16d2e08c60d49b925aa0e789f0f0be0", "parents": [ "4199cfa02b982f4c739e8a6a304d6a40e1935d25" ], "author": { "name": "Christoph Lameter", "email": "clameter@sgi.com", "time": "Tue Oct 16 01:25:35 2007 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@woody.linux-foundation.org", "time": "Tue Oct 16 09:42:58 2007 -0700" }, "message": "Memoryless nodes: Update memory policy and page migration\n\nOnline nodes now may have no memory. The checks and initialization must\ntherefore be changed to no longer use the online functions.\n\nThis will correctly initialize the interleave on bootup to only target nodes\nwith memory and will make sys_move_pages return an error when a page is to be\nmoved to a memoryless node. Similarly we will get an error if MPOL_BIND and\nMPOL_INTERLEAVE is used on a memoryless node.\n\nThese are somewhat new semantics. So far one could specify memoryless nodes\nand we would maybe do the right thing and just ignore the node (or we\u0027d do\nsomething strange like with MPOL_INTERLEAVE). If we want to allow the\nspecification of memoryless nodes via memory policies then we need to keep\nchecking for online nodes.\n\nSigned-off-by: Christoph Lameter \u003cclameter@sgi.com\u003e\nAcked-by: Nishanth Aravamudan \u003cnacc@us.ibm.com\u003e\nTested-by: Lee Schermerhorn \u003clee.schermerhorn@hp.com\u003e\nAcked-by: Bob Picco \u003cbob.picco@hp.com\u003e\nCc: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nCc: Mel Gorman \u003cmel@skynet.ie\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "9d966d495c4ac2fcbd010f681425f67141f80bad", "tree": "4df188540aa724b85fff6477e5315fd9ca984061", "parents": [ "411223c01a51163e995dbc2679bf8e963a136a5f" ], "author": { "name": "Al Viro", "email": "viro@ftp.linux.org.uk", "time": "Sun Oct 14 19:34:10 2007 +0100" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@woody.linux-foundation.org", "time": "Sun Oct 14 12:41:51 2007 -0700" }, "message": "mm/migrate.c __user annotation\n\nSigned-off-by: Al Viro \u003cviro@zeniv.linux.org.uk\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "989f89c57e6361e7d16fbd9572b5da7d313b073d", "tree": "cd5f655709e1515568c1e1f309f169723ce3b084", "parents": [ "d1254b12c93e1e586137a2ffef71fd33cf273f35" ], "author": { "name": "KAMEZAWA Hiroyuki", "email": "kamezawa.hiroyu@jp.fujitsu.com", "time": "Thu Aug 30 23:56:21 2007 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@woody.linux-foundation.org", "time": "Fri Aug 31 01:42:22 2007 -0700" }, "message": "fix rcu_read_lock() in page migraton\n\nIn migration fallback path, write_page() or lock_page() will be called.\nThis causes sleep with holding rcu_read_lock().\nFor avoding that, just do rcu_lock if the page is Anon.(this is enough.)\n\nSigned-off-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.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": "3dd9fe8c397df68086e6a1b2160573abbe944813", "tree": "86dda41ade146e2a403151c7ba2f7e32a930bc63", "parents": [ "dc386d4d1e98bb39fb967ee156cd456c802fc692" ], "author": { "name": "KAMEZAWA Hiroyuki", "email": "kamezawa.hiroyu@jp.fujitsu.com", "time": "Thu Jul 26 10:41:08 2007 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@woody.linux-foundation.org", "time": "Thu Jul 26 11:35:17 2007 -0700" }, "message": "memory unplug: isolate_lru_page fix\n\nrelease_pages() in mm/swap.c changes page_count() to be 0 without removing\nPageLRU flag...\n\nThis means isolate_lru_page() can see a page, PageLRU() \u0026\u0026\npage_count(page)\u003d\u003d0.. This is BUG. (get_page() will be called against\ncount\u003d0 page.)\n\nSigned-off-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.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": "dc386d4d1e98bb39fb967ee156cd456c802fc692", "tree": "ddd26eb0f08611a84157e4f8e1537a5127b96ea0", "parents": [ "098284020c47c1212d211e39ae2b41c21182e056" ], "author": { "name": "KAMEZAWA Hiroyuki", "email": "kamezawa.hiroyu@jp.fujitsu.com", "time": "Thu Jul 26 10:41:07 2007 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@woody.linux-foundation.org", "time": "Thu Jul 26 11:35:17 2007 -0700" }, "message": "memory unplug: migration by kernel\n\nIn usual, migrate_pages(page,,) is called with holding mm-\u003esem by system call.\n(mm here is a mm_struct which maps the migration target page.)\nThis semaphore helps avoiding some race conditions.\n\nBut, if we want to migrate a page by some kernel codes, we have to avoid\nsome races. This patch adds check code for following race condition.\n\n1. A page which page-\u003emapping\u003d\u003dNULL can be target of migration. Then, we have\n to check page-\u003emapping before calling try_to_unmap().\n\n2. anon_vma can be freed while page is unmapped, but page-\u003emapping remains as\n it was. We drop page-\u003emapcount to be 0. Then we cannot trust page-\u003emapping.\n So, use rcu_read_lock() to prevent anon_vma pointed by page-\u003emapping from\n being freed during migration.\n\nSigned-off-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.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": "769848c03895b63e5662eb7e4ec8c4866f7d0183", "tree": "8911c7c312c8b8b172795fa2874c8162e1d3d15a", "parents": [ "a32ea1e1f925399e0d81ca3f7394a44a6dafa12c" ], "author": { "name": "Mel Gorman", "email": "mel@csn.ul.ie", "time": "Tue Jul 17 04:03:05 2007 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@woody.linux-foundation.org", "time": "Tue Jul 17 10:22:59 2007 -0700" }, "message": "Add __GFP_MOVABLE for callers to flag allocations from high memory that may be migrated\n\nIt is often known at allocation time whether a page may be migrated or not.\nThis patch adds a flag called __GFP_MOVABLE and a new mask called\nGFP_HIGH_MOVABLE. Allocations using the __GFP_MOVABLE can be either migrated\nusing the page migration mechanism or reclaimed by syncing with backing\nstorage and discarding.\n\nAn API function very similar to alloc_zeroed_user_highpage() is added for\n__GFP_MOVABLE allocations called alloc_zeroed_user_highpage_movable(). The\nflags used by alloc_zeroed_user_highpage() are not changed because it would\nchange the semantics of an existing API. After this patch is applied there\nare no in-kernel users of alloc_zeroed_user_highpage() so it probably should\nbe marked deprecated if this patch is merged.\n\nNote that this patch includes a minor cleanup to the use of __GFP_ZERO in\nshmem.c to keep all flag modifications to inode-\u003emapping in the\nshmem_dir_alloc() helper function. This clean-up suggestion is courtesy of\nHugh Dickens.\n\nAdditional credit goes to Christoph Lameter and Linus Torvalds for shaping the\nconcept. Credit to Hugh Dickens for catching issues with shmem swap vector\nand ramfs allocations.\n\n[akpm@linux-foundation.org: build fix]\n[hugh@veritas.com: __GFP_ZERO cleanup]\nSigned-off-by: Mel Gorman \u003cmel@csn.ul.ie\u003e\nCc: Andy Whitcroft \u003capw@shadowen.org\u003e\nCc: 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" } ], "next": "0e8c7d0fd5b4999675c7d5cd95d0eb7106b756b3" }