)]}' { "log": [ { "commit": "e6f67b8c05f5e129e126f4409ddac6f25f58ffcb", "tree": "4df809de3016d2e84467bded094c192adaf5218a", "parents": [ "7b21a202b87b7f18587bd15ee6bdb477fed0fb43" ], "author": { "name": "Dave Kleikamp", "email": "dave.kleikamp@oracle.com", "time": "Wed Dec 21 11:05:48 2011 -0600" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Wed Dec 21 17:02:46 2011 -0800" }, "message": "vfs: __read_cache_page should use gfp argument rather than GFP_KERNEL\n\nlockdep reports a deadlock in jfs because a special inode\u0027s rw semaphore\nis taken recursively. The mapping\u0027s gfp mask is GFP_NOFS, but is not\nused when __read_cache_page() calls add_to_page_cache_lru().\n\nSigned-off-by: Dave Kleikamp \u003cdave.kleikamp@oracle.com\u003e\nAcked-by: Hugh Dickins \u003chughd@google.com\u003e\nAcked-by: Al Viro \u003cviro@zeniv.linux.org.uk\u003e\nCc: stable@kernel.org\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "0006526d78e93c3684c806bf7cf3f67dfa49c3c8", "tree": "024ff623dff8301d6b0e27453abd1ba043fd5285", "parents": [ "b75d91f7ca513f0a4d0d1ad0942fb90cf5a2bc88" ], "author": { "name": "Kautuk Consul", "email": "consul.kautuk@gmail.com", "time": "Mon Dec 19 17:12:04 2011 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Dec 20 10:25:04 2011 -0800" }, "message": "mm/vmalloc.c: remove static declaration of va from __get_vm_area_node\n\nStatic storage is not required for the struct vmap_area in\n__get_vm_area_node.\n\nRemoving \"static\" to store this variable on the stack instead.\n\nSigned-off-by: Kautuk Consul \u003cconsul.kautuk@gmail.com\u003e\nAcked-by: David Rientjes \u003crientjes@google.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "ff05b6f7ae762b6eb464183eec994b28ea09f6dd", "tree": "070237daa279229f3245b1498dfb3a81a0f01264", "parents": [ "a41c58a6665cc995e237303b05db42100b71b65e" ], "author": { "name": "Frantisek Hrbata", "email": "fhrbata@redhat.com", "time": "Mon Dec 19 17:11:59 2011 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Dec 20 10:25:04 2011 -0800" }, "message": "oom: fix integer overflow of points in oom_badness\n\nAn integer overflow will happen on 64bit archs if task\u0027s sum of rss,\nswapents and nr_ptes exceeds (2^31)/1000 value. This was introduced by\ncommit\n\nf755a04 oom: use pte pages in OOM score\n\nwhere the oom score computation was divided into several steps and it\u0027s no\nlonger computed as one expression in unsigned long(rss, swapents, nr_pte\nare unsigned long), where the result value assigned to points(int) is in\nrange(1..1000). So there could be an int overflow while computing\n\n176 points *\u003d 1000;\n\nand points may have negative value. Meaning the oom score for a mem hog task\nwill be one.\n\n196 if (points \u003c\u003d 0)\n197 return 1;\n\nFor example:\n[ 3366] 0 3366 35390480 24303939 5 0 0 oom01\nOut of memory: Kill process 3366 (oom01) score 1 or sacrifice child\n\nHere the oom1 process consumes more than 24303939(rss)*4096~\u003d92GB physical\nmemory, but it\u0027s oom score is one.\n\nIn this situation the mem hog task is skipped and oom killer kills another and\nmost probably innocent task with oom score greater than one.\n\nThe points variable should be of type long instead of int to prevent the\nint overflow.\n\nSigned-off-by: Frantisek Hrbata \u003cfhrbata@redhat.com\u003e\nAcked-by: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nAcked-by: Oleg Nesterov \u003coleg@redhat.com\u003e\nAcked-by: David Rientjes \u003crientjes@google.com\u003e\nCc: \u003cstable@vger.kernel.org\u003e\t\t[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": "a41c58a6665cc995e237303b05db42100b71b65e", "tree": "49842a2cde1ad77232cd4a5dadb5cb9796e2aee5", "parents": [ "481fe17e973fb97aa3edf17c69557afe88d8334f" ], "author": { "name": "Hillf Danton", "email": "dhillf@gmail.com", "time": "Mon Dec 19 17:11:57 2011 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Dec 20 10:25:04 2011 -0800" }, "message": "memcg: keep root group unchanged if creation fails\n\nIf the request is to create non-root group and we fail to meet it, we\nshould leave the root unchanged.\n\nSigned-off-by: Hillf Danton \u003cdhillf@gmail.com\u003e\nAcked-by: Hugh Dickins \u003chughd@google.com\u003e\nAcked-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nAcked-by: Michal Hocko \u003cmhocko@suse.cz\u003e\nCc: Balbir Singh \u003cbsingharora@gmail.com\u003e\nCc: David Rientjes \u003crientjes@google.com\u003e\nCc: Andrea Arcangeli \u003caarcange@redhat.com\u003e\nCc: Johannes Weiner \u003channes@cmpxchg.org\u003e\nCc: \u003cstable@vger.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": "9f57bd4d6dc69a4e3bf43044fa00fcd24dd363e3", "tree": "341942009371bfffde5a76630f4f9332de8a5c2a", "parents": [ "42ebfc61cfcb13af3e638db1c497dcbde7abfed8" ], "author": { "name": "Eugene Surovegin", "email": "ebs@ebshome.net", "time": "Thu Dec 15 11:25:59 2011 -0800" }, "committer": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Thu Dec 15 11:41:40 2011 -0800" }, "message": "percpu: fix per_cpu_ptr_to_phys() handling of non-page-aligned addresses\n\nper_cpu_ptr_to_phys() incorrectly rounds up its result for non-kmalloc\ncase to the page boundary, which is bogus for any non-page-aligned\naddress.\n\nThis affects the only in-tree user of this function - sysfs handler\nfor per-cpu \u0027crash_notes\u0027 physical address. The trouble is that the\ncrash_notes per-cpu variable is not page-aligned:\n\ncrash_notes \u003d 0xc08e8ed4\nPER-CPU OFFSET VALUES:\n CPU 0: 3711f000\n CPU 1: 37129000\n CPU 2: 37133000\n CPU 3: 3713d000\n\nSo, the per-cpu addresses are:\n crash_notes on CPU 0: f7a07ed4 \u003d\u003e phys 36b57ed4\n crash_notes on CPU 1: f7a11ed4 \u003d\u003e phys 36b4ded4\n crash_notes on CPU 2: f7a1bed4 \u003d\u003e phys 36b43ed4\n crash_notes on CPU 3: f7a25ed4 \u003d\u003e phys 36b39ed4\n\nHowever, /sys/devices/system/cpu/cpu*/crash_notes says:\n /sys/devices/system/cpu/cpu0/crash_notes: 36b57000\n /sys/devices/system/cpu/cpu1/crash_notes: 36b4d000\n /sys/devices/system/cpu/cpu2/crash_notes: 36b43000\n /sys/devices/system/cpu/cpu3/crash_notes: 36b39000\n\nAs you can see, all values are rounded down to a page\nboundary. Consequently, this is where kexec sets up the NOTE segments,\nand thus where the secondary kernel is looking for them. However, when\nthe first kernel crashes, it saves the notes to the unaligned\naddresses, where they are not found.\n\nFix it by adding offset_in_page() to the translated page address.\n\n-tj: Combined Eugene\u0027s and Petr\u0027s commit messages.\n\nSigned-off-by: Eugene Surovegin \u003cebs@ebshome.net\u003e\nSigned-off-by: Tejun Heo \u003ctj@kernel.org\u003e\nReported-by: Petr Tesarik \u003cptesarik@suse.cz\u003e\nCc: stable@kernel.org\n" }, { "commit": "4dde6dedad736b86bcea3722abb7d8031aeeaa16", "tree": "fac6c306bb1ae3461213937c564dddd634ad89a3", "parents": [ "442ee5a942834431ccf0b412e3cf7bb9ae97ff4e", "82e230a07de3812a5e87a27979f033dad59172e3" ], "author": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Dec 13 14:58:56 2011 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Dec 13 14:58:56 2011 -0800" }, "message": "Merge branch \u0027writeback-for-linus\u0027 of git://git.kernel.org/pub/scm/linux/kernel/git/wfg/linux\n\n* \u0027writeback-for-linus\u0027 of git://git.kernel.org/pub/scm/linux/kernel/git/wfg/linux:\n writeback: set max_pause to lowest value on zero bdi_dirty\n writeback: permit through good bdi even when global dirty exceeded\n writeback: comment on the bdi dirty threshold\n fs: Make write(2) interruptible by a fatal signal\n writeback: Fix issue on make htmldocs\n" }, { "commit": "1368edf0647ac112d8cfa6ce47257dc950c50f5c", "tree": "57b8c97689b2db9f22487c1b03a753d350ed657c", "parents": [ "d021563888312018ca65681096f62e36c20e63cc" ], "author": { "name": "Mel Gorman", "email": "mgorman@suse.de", "time": "Thu Dec 08 14:34:30 2011 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Fri Dec 09 07:50:29 2011 -0800" }, "message": "mm: vmalloc: check for page allocation failure before vmlist insertion\n\nCommit f5252e00 (\"mm: avoid null pointer access in vm_struct via\n/proc/vmallocinfo\") adds newly allocated vm_structs to the vmlist after\nit is fully initialised. Unfortunately, it did not check that\n__vmalloc_area_node() successfully populated the area. In the event of\nallocation failure, the vmalloc area is freed but the pointer to freed\nmemory is inserted into the vmlist leading to a a crash later in\nget_vmalloc_info().\n\nThis patch adds a check for ____vmalloc_area_node() failure within\n__vmalloc_node_range. It does not use \"goto fail\" as in the previous\nerror path as a warning was already displayed by __vmalloc_area_node()\nbefore it called vfree in its failure path.\n\nCredit goes to Luciano Chavez for doing all the real work of identifying\nexactly where the problem was.\n\nSigned-off-by: Mel Gorman \u003cmgorman@suse.de\u003e\nReported-by: Luciano Chavez \u003clnx1138@linux.vnet.ibm.com\u003e\nTested-by: Luciano Chavez \u003clnx1138@linux.vnet.ibm.com\u003e\nReviewed-by: Rik van Riel \u003criel@redhat.com\u003e\nAcked-by: David Rientjes \u003crientjes@google.com\u003e\nCc: \u003cstable@vger.kernel.org\u003e\t\t[3.1.x+]\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "d021563888312018ca65681096f62e36c20e63cc", "tree": "cf403dfc0fd5a3775735815031add2f97b6efd40", "parents": [ "09761333ed47e899cc1482c13090b95f3f711971" ], "author": { "name": "Michal Hocko", "email": "mhocko@suse.cz", "time": "Thu Dec 08 14:34:27 2011 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Fri Dec 09 07:50:28 2011 -0800" }, "message": "mm: Ensure that pfn_valid() is called once per pageblock when reserving pageblocks\n\nsetup_zone_migrate_reserve() expects that zone-\u003estart_pfn starts at\npageblock_nr_pages aligned pfn otherwise we could access beyond an\nexisting memblock resulting in the following panic if\nCONFIG_HOLES_IN_ZONE is not configured and we do not check pfn_valid:\n\n IP: [\u003cc02d331d\u003e] setup_zone_migrate_reserve+0xcd/0x180\n *pdpt \u003d 0000000000000000 *pde \u003d f000ff53f000ff53\n Oops: 0000 [#1] SMP\n Pid: 1, comm: swapper Not tainted 3.0.7-0.7-pae #1 VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform\n EIP: 0060:[\u003cc02d331d\u003e] EFLAGS: 00010006 CPU: 0\n EIP is at setup_zone_migrate_reserve+0xcd/0x180\n EAX: 000c0000 EBX: f5801fc0 ECX: 000c0000 EDX: 00000000\n ESI: 000c01fe EDI: 000c01fe EBP: 00140000 ESP: f2475f58\n DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068\n Process swapper (pid: 1, ti\u003df2474000 task\u003df2472cd0 task.ti\u003df2474000)\n Call Trace:\n [\u003cc02d389c\u003e] __setup_per_zone_wmarks+0xec/0x160\n [\u003cc02d3a1f\u003e] setup_per_zone_wmarks+0xf/0x20\n [\u003cc08a771c\u003e] init_per_zone_wmark_min+0x27/0x86\n [\u003cc020111b\u003e] do_one_initcall+0x2b/0x160\n [\u003cc086639d\u003e] kernel_init+0xbe/0x157\n [\u003cc05cae26\u003e] kernel_thread_helper+0x6/0xd\n Code: a5 39 f5 89 f7 0f 46 fd 39 cf 76 40 8b 03 f6 c4 08 74 32 eb 91 90 89 c8 c1 e8 0e 0f be 80 80 2f 86 c0 8b 14 85 60 2f 86 c0 89 c8 \u003c2b\u003e 82 b4 12 00 00 c1 e0 05 03 82 ac 12 00 00 8b 00 f6 c4 08 0f\n EIP: [\u003cc02d331d\u003e] setup_zone_migrate_reserve+0xcd/0x180 SS:ESP 0068:f2475f58\n CR2: 00000000000012b4\n\nWe crashed in pageblock_is_reserved() when accessing pfn 0xc0000 because\nhighstart_pfn \u003d 0x36ffe.\n\nThe issue was introduced in 3.0-rc1 by 6d3163ce (\"mm: check if any page\nin a pageblock is reserved before marking it MIGRATE_RESERVE\").\n\nMake sure that start_pfn is always aligned to pageblock_nr_pages to\nensure that pfn_valid s always called at the start of each pageblock.\nArchitectures with holes in pageblocks will be correctly handled by\npfn_valid_within in pageblock_is_reserved.\n\nSigned-off-by: Michal Hocko \u003cmhocko@suse.cz\u003e\nSigned-off-by: Mel Gorman \u003cmgorman@suse.de\u003e\nTested-by: Dang Bo \u003cbdang@vmware.com\u003e\nReviewed-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nCc: Andrea Arcangeli \u003caarcange@redhat.com\u003e\nCc: David Rientjes \u003crientjes@google.com\u003e\nCc: Arve Hjnnevg \u003carve@android.com\u003e\nCc: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nCc: John Stultz \u003cjohn.stultz@linaro.org\u003e\nCc: Dave Hansen \u003cdave@linux.vnet.ibm.com\u003e\nCc: \u003cstable@vger.kernel.org\u003e\t[3.0+]\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "09761333ed47e899cc1482c13090b95f3f711971", "tree": "b2563e89da16b64727b45b384dba94e1dcd8dfa2", "parents": [ "58a84aa92723d1ac3e1cc4e3b0ff49291663f7e1" ], "author": { "name": "Hillf Danton", "email": "dhillf@gmail.com", "time": "Thu Dec 08 14:34:20 2011 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Fri Dec 09 07:50:28 2011 -0800" }, "message": "mm/migrate.c: pair unlock_page() and lock_page() when migrating huge pages\n\nAvoid unlocking and unlocked page if we failed to lock it.\n\nSigned-off-by: Hillf Danton \u003cdhillf@gmail.com\u003e\nCc: Naoya Horiguchi \u003cn-horiguchi@ah.jp.nec.com\u003e\nCc: Andrea Arcangeli \u003caarcange@redhat.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "58a84aa92723d1ac3e1cc4e3b0ff49291663f7e1", "tree": "bdfad6b0f38590318da0dee67ff84718b60a8ca5", "parents": [ "b6999b19120931ede364fa3b685e698a61fed31d" ], "author": { "name": "Youquan Song", "email": "youquan.song@intel.com", "time": "Thu Dec 08 14:34:18 2011 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Fri Dec 09 07:50:28 2011 -0800" }, "message": "thp: set compound tail page _count to zero\n\nCommit 70b50f94f1644 (\"mm: thp: tail page refcounting fix\") keeps all\npage_tail-\u003e_count zero at all times. But the current kernel does not\nset page_tail-\u003e_count to zero if a 1GB page is utilized. So when an\nIOMMU 1GB page is used by KVM, it wil result in a kernel oops because a\ntail page\u0027s _count does not equal zero.\n\n kernel BUG at include/linux/mm.h:386!\n invalid opcode: 0000 [#1] SMP\n Call Trace:\n gup_pud_range+0xb8/0x19d\n get_user_pages_fast+0xcb/0x192\n ? trace_hardirqs_off+0xd/0xf\n hva_to_pfn+0x119/0x2f2\n gfn_to_pfn_memslot+0x2c/0x2e\n kvm_iommu_map_pages+0xfd/0x1c1\n kvm_iommu_map_memslots+0x7c/0xbd\n kvm_iommu_map_guest+0xaa/0xbf\n kvm_vm_ioctl_assigned_device+0x2ef/0xa47\n kvm_vm_ioctl+0x36c/0x3a2\n do_vfs_ioctl+0x49e/0x4e4\n sys_ioctl+0x5a/0x7c\n system_call_fastpath+0x16/0x1b\n RIP gup_huge_pud+0xf2/0x159\n\nSigned-off-by: Youquan Song \u003cyouquan.song@intel.com\u003e\nReviewed-by: Andrea Arcangeli \u003caarcange@redhat.com\u003e\nCc: \u003cstable@vger.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": "1dfb059b9438633b0546c5431538a47f6ed99028", "tree": "4e6181dfc2f8f21e01938246842305243c1bdb0e", "parents": [ "b53fc7c2974a50913f49e1d800fe904a28c338e3" ], "author": { "name": "Andrea Arcangeli", "email": "aarcange@redhat.com", "time": "Thu Dec 08 14:33:57 2011 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Fri Dec 09 07:50:28 2011 -0800" }, "message": "thp: reduce khugepaged freezing latency\n\nkhugepaged can sometimes cause suspend to fail, requiring that the user\nretry the suspend operation.\n\nUse wait_event_freezable_timeout() instead of\nschedule_timeout_interruptible() to avoid missing freezer wakeups. A\ntry_to_freeze() would have been needed in the khugepaged_alloc_hugepage\ntight loop too in case of the allocation failing repeatedly, and\nwait_event_freezable_timeout will provide it too.\n\nkhugepaged would still freeze just fine by trying again the next minute\nbut it\u0027s better if it freezes immediately.\n\nReported-by: Jiri Slaby \u003cjslaby@suse.cz\u003e\nSigned-off-by: Andrea Arcangeli \u003caarcange@redhat.com\u003e\nTested-by: Jiri Slaby \u003cjslaby@suse.cz\u003e\nCc: Tejun Heo \u003ctj@kernel.org\u003e\nCc: Oleg Nesterov \u003coleg@redhat.com\u003e\nCc: \"Srivatsa S. Bhat\" \u003csrivatsa.bhat@linux.vnet.ibm.com\u003e\nCc: \"Rafael J. Wysocki\" \u003crjw@suse.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "83aeeada7c69f35e5100b27ec354335597a7a488", "tree": "44644e68f303368feba7c8ba3e0e0991d6238ada", "parents": [ "635697c663f38106063d5659f0cf2e45afcd4bb5" ], "author": { "name": "Konstantin Khlebnikov", "email": "khlebnikov@openvz.org", "time": "Thu Dec 08 14:33:54 2011 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Fri Dec 09 07:50:27 2011 -0800" }, "message": "vmscan: use atomic-long for shrinker batching\n\nUse atomic-long operations instead of looping around cmpxchg().\n\n[akpm@linux-foundation.org: massage atomic.h inclusions]\nSigned-off-by: Konstantin Khlebnikov \u003ckhlebnikov@openvz.org\u003e\nCc: Dave Chinner \u003cdavid@fromorbit.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "635697c663f38106063d5659f0cf2e45afcd4bb5", "tree": "3aba50aabc16eeb63d5e21979a3fdf163ccabda2", "parents": [ "09d9673d53005fdf40de4c759425893904292236" ], "author": { "name": "Konstantin Khlebnikov", "email": "khlebnikov@openvz.org", "time": "Thu Dec 08 14:33:51 2011 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Fri Dec 09 07:50:27 2011 -0800" }, "message": "vmscan: fix initial shrinker size handling\n\nA shrinker function can return -1, means that it cannot do anything\nwithout a risk of deadlock. For example prune_super() does this if it\ncannot grab a superblock refrence, even if nr_to_scan\u003d0. Currently we\ninterpret this -1 as a ULONG_MAX size shrinker and evaluate `total_scan\u0027\naccording to this. So the next time around this shrinker can cause\nreally big pressure. Let\u0027s skip such shrinkers instead.\n\nAlso make total_scan signed, otherwise the check (total_scan \u003c 0) below\nnever works.\n\nSigned-off-by: Konstantin Khlebnikov \u003ckhlebnikov@openvz.org\u003e\nCc: Dave Chinner \u003cdavid@fromorbit.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "82e230a07de3812a5e87a27979f033dad59172e3", "tree": "672ecaa3a1cf3585aa941491b2cf77ae38f1d8ff", "parents": [ "c5c6343c4d75f9d3226e05a72e7861e967fc8099" ], "author": { "name": "Wu Fengguang", "email": "fengguang.wu@intel.com", "time": "Fri Dec 02 18:21:51 2011 -0600" }, "committer": { "name": "Wu Fengguang", "email": "fengguang.wu@intel.com", "time": "Thu Dec 08 10:49:29 2011 +0800" }, "message": "writeback: set max_pause to lowest value on zero bdi_dirty\n\nSome trace shows lots of bdi_dirty\u003d0 lines where it\u0027s actually some\nsmall value if w/o the accounting errors in the per-cpu bdi stats.\n\nIn this case the max pause time should really be set to the smallest\n(non-zero) value to avoid IO queue underrun and improve throughput.\n\nSigned-off-by: Wu Fengguang \u003cfengguang.wu@intel.com\u003e\n" }, { "commit": "c5c6343c4d75f9d3226e05a72e7861e967fc8099", "tree": "e31d6d748b347314d7ef64fac8f14acc36dfb701", "parents": [ "aed21ad28b1323b2807faea019e5ac388a7bc837" ], "author": { "name": "Wu Fengguang", "email": "fengguang.wu@intel.com", "time": "Fri Dec 02 10:21:33 2011 -0600" }, "committer": { "name": "Wu Fengguang", "email": "fengguang.wu@intel.com", "time": "Thu Dec 08 10:49:27 2011 +0800" }, "message": "writeback: permit through good bdi even when global dirty exceeded\n\nOn a system with 1 local mount and 1 NFS mount, if the NFS server\nbecomes not responding when dd to the NFS mount, the NFS dirty pages may\nexceed the global dirty limit and _every_ task involving writing will be\nblocked. The whole system appears unresponsive.\n\nThe workaround is to permit through the bdi\u0027s that only has a small\nnumber of dirty pages. The number chosen (bdi_stat_error pages) is not\nenough to enable the local disk to run in optimal throughput, however is\nenough to make the system responsive on a broken NFS mount. The user can\nthen kill the dirtiers on the NFS mount and increase the global dirty\nlimit to bring up the local disk\u0027s throughput.\n\nIt risks allowing dirty pages to grow much larger than the global dirty\nlimit when there are 1000+ mounts, however that\u0027s very unlikely to happen,\nespecially in low memory profiles.\n\nSigned-off-by: Wu Fengguang \u003cfengguang.wu@intel.com\u003e\n" }, { "commit": "aed21ad28b1323b2807faea019e5ac388a7bc837", "tree": "64d6bf0e86b7d256621420d2266d5c7c29bb5d50", "parents": [ "a50527b19c62c808a7fca022816fff88a50b948d" ], "author": { "name": "Wu Fengguang", "email": "fengguang.wu@intel.com", "time": "Wed Nov 23 11:44:41 2011 -0600" }, "committer": { "name": "Wu Fengguang", "email": "fengguang.wu@intel.com", "time": "Thu Dec 08 10:49:20 2011 +0800" }, "message": "writeback: comment on the bdi dirty threshold\n\nWe do \"floating proportions\" to let active devices to grow its target\nshare of dirty pages and stalled/inactive devices to decrease its target\nshare over time.\n\nIt works well except in the case of \"an inactive disk suddenly goes\nbusy\", where the initial target share may be too small. To mitigate\nthis, bdi_position_ratio() has the below line to raise a small\nbdi_thresh when it\u0027s safe to do so, so that the disk be feed with enough\ndirty pages for efficient IO and in turn fast rampup of bdi_thresh:\n\n bdi_thresh \u003d max(bdi_thresh, (limit - dirty) / 8);\n\nbalance_dirty_pages() normally does negative feedback control which\nadjusts ratelimit to balance the bdi dirty pages around the target.\nIn some extreme cases when that is not enough, it will have to block\nthe tasks completely until the bdi dirty pages drop below bdi_thresh.\n\nAcked-by: Jan Kara \u003cjack@suse.cz\u003e\nAcked-by: Peter Zijlstra \u003ca.p.zijlstra@chello.nl\u003e\nSigned-off-by: Wu Fengguang \u003cfengguang.wu@intel.com\u003e\n" }, { "commit": "52cef189165d74a5d6030184a8e05595194c69ca", "tree": "c7c4c612d14d9d6bdb24fda2725cb3da09badfed", "parents": [ "8e8da023f5af71662867729db5547dc54786093c" ], "author": { "name": "Peter Zijlstra", "email": "a.p.zijlstra@chello.nl", "time": "Mon Nov 28 21:12:40 2011 +0100" }, "committer": { "name": "Ingo Molnar", "email": "mingo@elte.hu", "time": "Mon Dec 05 09:44:00 2011 +0100" }, "message": "slab, lockdep: Fix silly bug\n\nCommit 30765b92 (\"slab, lockdep: Annotate the locks before using\nthem\") moves the init_lock_keys() call from after g_cpucache_up \u003d\nFULL, to before it. And overlooks the fact that init_node_lock_keys()\ntests for it and ignores everything !FULL.\n\nIntroduce a LATE stage and change the lockdep test to be \u003cLATE.\n\nAcked-by: Christoph Lameter \u003ccl@linux.com\u003e\nCc: Pekka Enberg \u003cpenberg@kernel.org\u003e\nCc: stable@kernel.org\nSigned-off-by: Peter Zijlstra \u003ca.p.zijlstra@chello.nl\u003e\nSigned-off-by: Ingo Molnar \u003cmingo@elte.hu\u003e\n" }, { "commit": "a50527b19c62c808a7fca022816fff88a50b948d", "tree": "6f9bb1a5176b1a428ce272d398a2c784ee12f2eb", "parents": [ "786228ab3095fe18dba3bc0d62055a123991d9d9" ], "author": { "name": "Jan Kara", "email": "jack@suse.cz", "time": "Fri Dec 02 09:17:02 2011 +0800" }, "committer": { "name": "Wu Fengguang", "email": "fengguang.wu@intel.com", "time": "Fri Dec 02 09:17:05 2011 +0800" }, "message": "fs: Make write(2) interruptible by a fatal signal\n\nCurrently write(2) to a file is not interruptible by any signal.\nSometimes this is desirable, e.g. when you want to quickly kill a\nprocess hogging your disk. Also, with commit 499d05ecf990 (\"mm: Make\ntask in balance_dirty_pages() killable\"), it\u0027s necessary to abort the\ncurrent write accordingly to avoid it quickly dirtying lots more pages\nat unthrottled rate.\n\nThis patch makes write interruptible by SIGKILL. We do not allow write\nto be interruptible by any other signal because that has larger\npotential of screwing some badly written applications.\n\nReported-by: Kazuya Mio \u003ck-mio@sx.jp.nec.com\u003e\nTested-by: Kazuya Mio \u003ck-mio@sx.jp.nec.com\u003e\nAcked-by: Matthew Wilcox \u003cmatthew.r.wilcox@intel.com\u003e\nSigned-off-by: Jan Kara \u003cjack@suse.cz\u003e\nSigned-off-by: Wu Fengguang \u003cfengguang.wu@intel.com\u003e\n" }, { "commit": "57db53b07429c0d648f48727dd6c7c2b64c5708d", "tree": "b6dcc299de4e3ab26d9acf5ec4b572789eb38cda", "parents": [ "883381d9f1c5a6329bbb796e23ae52c939940310", "bc6697d8a506dedf09e8e9974ffa3a316183e608" ], "author": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Nov 29 11:13:22 2011 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Nov 29 11:13:22 2011 -0800" }, "message": "Merge branch \u0027slab/urgent\u0027 of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/linux\n\n* \u0027slab/urgent\u0027 of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/linux:\n slub: avoid potential NULL dereference or corruption\n slub: use irqsafe_cpu_cmpxchg for put_cpu_partial\n slub: move discard_slab out of node lock\n slub: use correct parameter to add a page to partial list tail\n" }, { "commit": "9b5a4d4f65e260a109eaeea8bbc8062a7c58b55e", "tree": "ccb231635a020b629f95972dc67268d1156e5c03", "parents": [ "cb3599926e3e7b3678583195effa61a03026ab0e", "67589c71456b0346500629967292dea3802230b6" ], "author": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Nov 28 13:49:43 2011 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Nov 28 13:49:43 2011 -0800" }, "message": "Merge branch \u0027for-3.2-fixes\u0027 of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu\n\n* \u0027for-3.2-fixes\u0027 of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu:\n percpu: explain why per_cpu_ptr_to_phys() is more complicated than necessary\n percpu: fix chunk range calculation\n percpu: rename pcpu_mem_alloc to pcpu_mem_zalloc\n" }, { "commit": "bc6697d8a506dedf09e8e9974ffa3a316183e608", "tree": "b54d3d45349fb8a00ce8a086da55a1ebf3394646", "parents": [ "42d623a8cd08eb93ab221d22cee5a62618895bbf" ], "author": { "name": "Eric Dumazet", "email": "eric.dumazet@gmail.com", "time": "Tue Nov 22 16:02:02 2011 +0100" }, "committer": { "name": "Pekka Enberg", "email": "penberg@kernel.org", "time": "Thu Nov 24 08:44:19 2011 +0200" }, "message": "slub: avoid potential NULL dereference or corruption\n\nshow_slab_objects() can trigger NULL dereferences or memory corruption.\n\nAnother cpu can change its c-\u003epage to NULL or c-\u003enode to NUMA_NO_NODE\nwhile we use them.\n\nUse ACCESS_ONCE(c-\u003epage) and ACCESS_ONCE(c-\u003enode) to make sure this\ncannot happen.\n\nAcked-by: Christoph Lameter \u003ccl@linux.com\u003e\nAcked-by: David Rientjes \u003crientjes@google.com\u003e\nSigned-off-by: Eric Dumazet \u003ceric.dumazet@gmail.com\u003e\nSigned-off-by: Pekka Enberg \u003cpenberg@kernel.org\u003e\n" }, { "commit": "42d623a8cd08eb93ab221d22cee5a62618895bbf", "tree": "c2bc80e3b59253f3d4c9e81e608ba59d15a5bf0e", "parents": [ "9ada19342b2441f290f0043ed7c562682c8c4ede" ], "author": { "name": "Christoph Lameter", "email": "cl@linux.com", "time": "Wed Nov 23 09:14:38 2011 -0600" }, "committer": { "name": "Pekka Enberg", "email": "penberg@kernel.org", "time": "Thu Nov 24 08:44:14 2011 +0200" }, "message": "slub: use irqsafe_cpu_cmpxchg for put_cpu_partial\n\nThe cmpxchg must be irq safe. The fallback for this_cpu_cmpxchg only\ndisables preemption which results in per cpu partial page operation\npotentially failing on non x86 platforms.\n\nThis patch fixes the following problem reported by Christian Kujau:\n\n I seem to hit it with heavy disk \u0026 cpu IO is in progress on this\n PowerBook\n G4. Full dmesg \u0026 .config: http://nerdbynature.de/bits/3.2.0-rc1/oops/\n\n I\u0027ve enabled some debug options and now it really points to slub.c:2166\n\n http://nerdbynature.de/bits/3.2.0-rc1/oops/oops4m.jpg\n\n With debug options enabled I\u0027m currently in the xmon debugger, not sure\n what to make of it yet, I\u0027ll try to get something useful out of it :)\n\nReported-by: Christian Kujau \u003clists@nerdbynature.de\u003e\nTested-by: Christian Kujau \u003clists@nerdbynature.de\u003e\nAcked-by: Eric Dumazet \u003ceric.dumazet@gmail.com\u003e\nAcked-by: David Rientjes \u003crientjes@google.com\u003e\nSigned-off-by: Christoph Lameter \u003ccl@linux.com\u003e\nSigned-off-by: Pekka Enberg \u003cpenberg@kernel.org\u003e\n" }, { "commit": "67589c71456b0346500629967292dea3802230b6", "tree": "2fdbe50888cc77b740862c0f6f182082a4aeeab9", "parents": [ "a855b84c3d8c73220d4d3cd392a7bee7c83de70e" ], "author": { "name": "Dave Young", "email": "dyoung@redhat.com", "time": "Wed Nov 23 08:20:53 2011 -0800" }, "committer": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Wed Nov 23 08:20:53 2011 -0800" }, "message": "percpu: explain why per_cpu_ptr_to_phys() is more complicated than necessary\n\nAdd comments about current per_cpu_ptr_to_phys implementation to\nexplain why the logic is more complicated than necessary.\n\n-tj: relocated comment into kerneldoc comment\n\nSigned-off-by: Dave Young \u003cdyoung@redhat.com\u003e\nSigned-off-by: Tejun Heo \u003ctj@kernel.org\u003e\n" }, { "commit": "8ba8ed54de4dd79bb88ab6cd7dbf2e83d58d6d57", "tree": "d4d1c687f1b7f58783103b43a04618d8e4019bba", "parents": [ "bbbc4791cd48ac12996e43c0033b504c79b53639", "468e6a20afaccb67e2a7d7f60d301f90e1c6f301" ], "author": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Nov 22 08:22:48 2011 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Nov 22 08:22:48 2011 -0800" }, "message": "Merge branch \u0027writeback-for-linus\u0027 of git://git.kernel.org/pub/scm/linux/kernel/git/wfg/linux\n\n* \u0027writeback-for-linus\u0027 of git://git.kernel.org/pub/scm/linux/kernel/git/wfg/linux:\n writeback: remove vm_dirties and task-\u003edirties\n writeback: hard throttle 1000+ dd on a slow USB stick\n mm: Make task in balance_dirty_pages() killable\n" }, { "commit": "a855b84c3d8c73220d4d3cd392a7bee7c83de70e", "tree": "3134cd884a2c625cf72172c9cb4e4a5e68d749f2", "parents": [ "90459ce06f410b983540be56209c0abcbce23944" ], "author": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Fri Nov 18 10:55:35 2011 -0800" }, "committer": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Tue Nov 22 08:09:46 2011 -0800" }, "message": "percpu: fix chunk range calculation\n\nPercpu allocator recorded the cpus which map to the first and last\nunits in pcpu_first/last_unit_cpu respectively and used them to\ndetermine the address range of a chunk - e.g. it assumed that the\nfirst unit has the lowest address in a chunk while the last unit has\nthe highest address.\n\nThis simply isn\u0027t true. Groups in a chunk can have arbitrary positive\nor negative offsets from the previous one and there is no guarantee\nthat the first unit occupies the lowest offset while the last one the\nhighest.\n\nFix it by actually comparing unit offsets to determine cpus occupying\nthe lowest and highest offsets. Also, rename pcu_first/last_unit_cpu\nto pcpu_low/high_unit_cpu to avoid confusion.\n\nThe chunk address range is used to flush cache on vmalloc area\nmap/unmap and decide whether a given address is in the first chunk by\nper_cpu_ptr_to_phys() and the bug was discovered by invalid\nper_cpu_ptr_to_phys() translation for crash_note.\n\nKudos to Dave Young for tracking down the problem.\n\nSigned-off-by: Tejun Heo \u003ctj@kernel.org\u003e\nReported-by: WANG Cong \u003cxiyou.wangcong@gmail.com\u003e\nReported-by: Dave Young \u003cdyoung@redhat.com\u003e\nTested-by: Dave Young \u003cdyoung@redhat.com\u003e\nLKML-Reference: \u003c4EC21F67.10905@redhat.com\u003e\nCc: stable @kernel.org\n" }, { "commit": "90459ce06f410b983540be56209c0abcbce23944", "tree": "de385624ae9bf2dc3c5bf0f54d97ac7db5241108", "parents": [ "f8f5ed7c996ad9426847ce09b828d415cb19bc06" ], "author": { "name": "Bob Liu", "email": "lliubbo@gmail.com", "time": "Thu Aug 04 11:02:33 2011 +0200" }, "committer": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Tue Nov 22 08:09:41 2011 -0800" }, "message": "percpu: rename pcpu_mem_alloc to pcpu_mem_zalloc\n\nCurrently pcpu_mem_alloc() is implemented always return zeroed memory.\nSo rename it to make user like pcpu_get_pages_and_bitmap() know don\u0027t\nreinit it.\n\nSigned-off-by: Bob Liu \u003clliubbo@gmail.com\u003e\nReviewed-by: Pekka Enberg \u003cpenberg@kernel.org\u003e\nReviewed-by: Michal Hocko \u003cmhocko@suse.cz\u003e\nSigned-off-by: Tejun Heo \u003ctj@kernel.org\u003e\n" }, { "commit": "b6844523839779030430ff28f036f83e2a3f43e6", "tree": "0af97f08911fab7e1351646172b1805c287ea300", "parents": [ "15bd1cfb3055d866614cdaf38e43201936264e50", "99cb2ddcc617f43917e94a4147aa3ccdb2bcd77e" ], "author": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Fri Nov 18 13:18:07 2011 -0200" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Fri Nov 18 13:18:07 2011 -0200" }, "message": "Merge branch \u0027stable/for-linus-fixes-3.2\u0027 of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen\n\n* \u0027stable/for-linus-fixes-3.2\u0027 of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen:\n xen-gntalloc: signedness bug in add_grefs()\n xen-gntalloc: integer overflow in gntalloc_ioctl_alloc()\n xen-gntdev: integer overflow in gntdev_alloc_map()\n xen:pvhvm: enable PVHVM VCPU placement when using more than 32 CPUs.\n xen/balloon: Avoid OOM when requesting highmem\n xen: Remove hanging references to CONFIG_XEN_PLATFORM_PCI\n xen: map foreign pages for shared rings by updating the PTEs directly\n" }, { "commit": "15bd1cfb3055d866614cdaf38e43201936264e50", "tree": "020261b5a984684201a39e661934aa5dcdf82f83", "parents": [ "9545eb61e5bb70055fd9358f25f95387f7398cba", "019ceb7d5d252ce71001a157cf29f4ac28501b72" ], "author": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Fri Nov 18 09:34:35 2011 -0200" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Fri Nov 18 09:34:35 2011 -0200" }, "message": "Merge branch \u0027for-linus\u0027 of git://git.kernel.dk/linux-block\n\n* \u0027for-linus\u0027 of git://git.kernel.dk/linux-block:\n block: add missed trace_block_plug\n paride: fix potential information leak in pg_read()\n bio: change some signed vars to unsigned\n block: avoid unnecessary plug list flush\n cciss: auto engage SCSI mid layer at driver load time\n loop: cleanup set_status interface\n include/linux/bio.h: use a static inline function for bio_integrity_clone()\n loop: prevent information leak after failed read\n block: Always check length of all iov entries in blk_rq_map_user_iov()\n The Windows driver .inf disables ASPM on all cciss devices. Do the same.\n backing-dev: ensure wakeup_timer is deleted\n block: Revert \"[SCSI] genhd: add a new attribute \"alias\" in gendisk\"\n" }, { "commit": "468e6a20afaccb67e2a7d7f60d301f90e1c6f301", "tree": "5558e92e85decd0fa0bb95ed6e637e1f68ea2fe1", "parents": [ "1df647197c5b8aacaeb58592cba9a1df322c9000" ], "author": { "name": "Wu Fengguang", "email": "fengguang.wu@intel.com", "time": "Wed Sep 07 10:41:32 2011 -0600" }, "committer": { "name": "Wu Fengguang", "email": "fengguang.wu@intel.com", "time": "Thu Nov 17 20:49:06 2011 +0800" }, "message": "writeback: remove vm_dirties and task-\u003edirties\n\nThey are not used any more.\n\nSigned-off-by: Wu Fengguang \u003cfengguang.wu@intel.com\u003e\n" }, { "commit": "1df647197c5b8aacaeb58592cba9a1df322c9000", "tree": "d413b165aca10d3a6058e39430680e38c09c0037", "parents": [ "499d05ecf990a7a7bbf9e0a273f9969f8ec69efc" ], "author": { "name": "Wu Fengguang", "email": "fengguang.wu@intel.com", "time": "Sun Nov 13 19:47:32 2011 -0600" }, "committer": { "name": "Wu Fengguang", "email": "fengguang.wu@intel.com", "time": "Thu Nov 17 20:39:32 2011 +0800" }, "message": "writeback: hard throttle 1000+ dd on a slow USB stick\n\nThe sleep based balance_dirty_pages() can pause at most MAX_PAUSE\u003d200ms\non every 1 4KB-page, which means it cannot throttle a task under\n4KB/200ms\u003d20KB/s. So when there are more than 512 dd writing to a\n10MB/s USB stick, its bdi dirty pages could grow out of control.\n\nEven if we can increase MAX_PAUSE, the minimal (task_ratelimit \u003d 1)\nmeans a limit of 4KB/s.\n \nThey can eventually be safeguarded by the global limit check \n(nr_dirty \u003c dirty_thresh). However if someone is also writing to an \nHDD at the same time, it\u0027ll get poor HDD write performance.\n \nWe at least want to maintain good write performance for other devices\nwhen one device is attacked by some \"massive parallel\" workload, or\nsuffers from slow write bandwidth, or somehow get stalled due to some \nerror condition (eg. NFS server not responding).\n\nFor a stalled device, we need to completely block its dirtiers, too,\nbefore its bdi dirty pages grow all the way up to the global limit and\nleave no space for the other functional devices.\n\nSo change the loop exit condition to\n\n\t/*\n\t * Always enforce global dirty limit; also enforce bdi dirty limit\n\t * if the normal max_pause sleeps cannot keep things under control.\n\t */\n\tif (nr_dirty \u003c dirty_thresh \u0026\u0026\n\t (bdi_dirty \u003c bdi_thresh || bdi-\u003edirty_ratelimit \u003e 1))\n\t\tbreak;\n\nwhich can be further simplified to\n\n\tif (task_ratelimit)\n\t\tbreak;\n\nSigned-off-by: Wu Fengguang \u003cfengguang.wu@intel.com\u003e\n" }, { "commit": "cd12909cb576d37311fe35868780e82d5007d0c8", "tree": "70ec60af4feb32087f542a838fe4dce8717f0cd6", "parents": [ "1ea6b8f48918282bdca0b32a34095504ee65bab5" ], "author": { "name": "David Vrabel", "email": "david.vrabel@citrix.com", "time": "Thu Sep 29 16:53:32 2011 +0100" }, "committer": { "name": "Konrad Rzeszutek Wilk", "email": "konrad.wilk@oracle.com", "time": "Wed Nov 16 12:13:08 2011 -0500" }, "message": "xen: map foreign pages for shared rings by updating the PTEs directly\n\nWhen mapping a foreign page with xenbus_map_ring_valloc() with the\nGNTTABOP_map_grant_ref hypercall, set the GNTMAP_contains_pte flag and\npass a pointer to the PTE (in init_mm).\n\nAfter the page is mapped, the usual fault mechanism can be used to\nupdate additional MMs. This allows the vmalloc_sync_all() to be\nremoved from alloc_vm_area().\n\nSigned-off-by: David Vrabel \u003cdavid.vrabel@citrix.com\u003e\nAcked-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\n[v1: Squashed fix by Michal for no-mmu case]\nSigned-off-by: Konrad Rzeszutek Wilk \u003ckonrad.wilk@oracle.com\u003e\nSigned-off-by: Michal Simek \u003cmonstr@monstr.eu\u003e\n" }, { "commit": "499d05ecf990a7a7bbf9e0a273f9969f8ec69efc", "tree": "cbcdc35276936db1d63959261bfbc02dda2b48a3", "parents": [ "6aaf05f472c97ebceff47d9eef464574f1a55727" ], "author": { "name": "Jan Kara", "email": "jack@suse.cz", "time": "Wed Nov 16 19:34:48 2011 +0800" }, "committer": { "name": "Wu Fengguang", "email": "fengguang.wu@intel.com", "time": "Wed Nov 16 19:53:44 2011 +0800" }, "message": "mm: Make task in balance_dirty_pages() killable\n\nThere is no reason why task in balance_dirty_pages() shouldn\u0027t be killable\nand it helps in recovering from some error conditions (like when filesystem\ngoes in error state and cannot accept writeback anymore but we still want to\nkill processes using it to be able to unmount it).\n\nThere will be follow up patches to further abort the generic_perform_write()\nand other filesystem write loops, to avoid large write + SIGKILL combination\nexceeding the dirty limit and possibly strange OOM.\n\nReported-by: Kazuya Mio \u003ck-mio@sx.jp.nec.com\u003e\nTested-by: Kazuya Mio \u003ck-mio@sx.jp.nec.com\u003e\nReviewed-by: Neil Brown \u003cneilb@suse.de\u003e\nReviewed-by: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nSigned-off-by: Jan Kara \u003cjack@suse.cz\u003e\nSigned-off-by: Wu Fengguang \u003cfengguang.wu@intel.com\u003e\n" }, { "commit": "ea4039a34c4c206d015d34a49d0b00868e37db1d", "tree": "1c7c38a83e0765f717f11079c573bb94f7445b77", "parents": [ "66e13e66b6c4e5b2ecd6225e1f8437640cfb6498" ], "author": { "name": "Hillf Danton", "email": "dhillf@gmail.com", "time": "Tue Nov 15 14:36:12 2011 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Nov 15 22:41:52 2011 -0200" }, "message": "hugetlb: release pages in the error path of hugetlb_cow()\n\nIf we fail to prepare an anon_vma, the {new, old}_page should be released,\nor they will leak.\n\nSigned-off-by: Hillf Danton \u003cdhillf@gmail.com\u003e\nReviewed-by: Andrea Arcangeli \u003caarcange@redhat.com\u003e\nCc: Hugh Dickins \u003chughd@google.com\u003e\nCc: Johannes Weiner \u003cjweiner@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": "5aecc85abdb9ac2b0e6548d13652a34142e7ae89", "tree": "8939325e1ab98bce8caf16d9bdd3e57cd73af846", "parents": [ "001ef5e4554b851cf50fe03bc4c266c28ed8e62d" ], "author": { "name": "Michal Hocko", "email": "mhocko@suse.cz", "time": "Tue Nov 15 14:36:07 2011 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Nov 15 22:41:51 2011 -0200" }, "message": "oom: do not kill tasks with oom_score_adj OOM_SCORE_ADJ_MIN\n\nCommit c9f01245 (\"oom: remove oom_disable_count\") has removed the\noom_disable_count counter which has been used for early break out from\noom_badness so we could never select a task with oom_score_adj set to\nOOM_SCORE_ADJ_MIN (oom disabled).\n\nNow that the counter is gone we are always going through heuristics\ncalculation and we always return a non zero positive value. This means\nthat we can end up killing a task with OOM disabled because it is\nindistinguishable from regular tasks with 1% resp. CAP_SYS_ADMIN tasks\nwith 3% usage of memory or tasks with oom_score_adj set but OOM enabled.\n\nLet\u0027s break out early if the task should have OOM disabled.\n\nSigned-off-by: Michal Hocko \u003cmhocko@suse.cz\u003e\nAcked-by: David Rientjes \u003crientjes@google.com\u003e\nAcked-by: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nCc: Oleg Nesterov \u003coleg@redhat.com\u003e\nCc: Ying Han \u003cyinghan@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": "9ada19342b2441f290f0043ed7c562682c8c4ede", "tree": "702599b3b616d4bce7415012d8d4d18c7c43e5ec", "parents": [ "f64ae042d94d376b54e7a343d93c48561e9d2e16" ], "author": { "name": "Shaohua Li", "email": "shaohua.li@intel.com", "time": "Mon Nov 14 13:34:13 2011 +0800" }, "committer": { "name": "Pekka Enberg", "email": "penberg@kernel.org", "time": "Tue Nov 15 20:41:00 2011 +0200" }, "message": "slub: move discard_slab out of node lock\n\nLockdep reports there is potential deadlock for slub node list_lock.\ndiscard_slab() is called with the lock hold in unfreeze_partials(),\nwhich could trigger a slab allocation, which could hold the lock again.\n\ndiscard_slab() doesn\u0027t need hold the lock actually, if the slab is\nalready removed from partial list.\n\nAcked-by: Christoph Lameter \u003ccl@linux.com\u003e\nReported-and-tested-by: Yong Zhang \u003cyong.zhang0@gmail.com\u003e\nReported-and-tested-by: Julie Sullivan \u003ckernelmail.jms@gmail.com\u003e\nSigned-off-by: Shaohua Li \u003cshaohua.li@intel.com\u003e\nSigned-off-by: Pekka Enberg \u003cpenberg@kernel.org\u003e\n" }, { "commit": "f64ae042d94d376b54e7a343d93c48561e9d2e16", "tree": "da4a9c1b06e5e1234cad1f2b7ae6dc3c372b26cc", "parents": [ "1ea6b8f48918282bdca0b32a34095504ee65bab5" ], "author": { "name": "Shaohua Li", "email": "shaohua.li@intel.com", "time": "Fri Nov 11 08:33:48 2011 +0800" }, "committer": { "name": "Pekka Enberg", "email": "penberg@kernel.org", "time": "Tue Nov 15 20:37:15 2011 +0200" }, "message": "slub: use correct parameter to add a page to partial list tail\n\nunfreeze_partials() needs add the page to partial list tail, since such page\nhasn\u0027t too many free objects. We now explictly use DEACTIVATE_TO_TAIL for this,\nwhile DEACTIVATE_TO_TAIL !\u003d 1. This will cause performance regression (eg, more\nlock contention in node-\u003elist_lock) without below fix.\n\nSigned-off-by: Shaohua Li \u003cshaohua.li@intel.com\u003e\nAcked-by: Christoph Lameter \u003ccl@linux.com\u003e\nAcked-by: David Rientjes \u003crientjes@google.com\u003e\nSigned-off-by: Pekka Enberg \u003cpenberg@kernel.org\u003e\n" }, { "commit": "7a401a972df8e184b3d1a3fc958c0a4ddee8d312", "tree": "b42d7c60b9c9826f79c4f3c30a623ebe7b40ce1a", "parents": [ "d0985394e7fee6b25a7cc8335d45bc1c1a8ab2d3" ], "author": { "name": "Rabin Vincent", "email": "rabin.vincent@stericsson.com", "time": "Fri Nov 11 13:29:04 2011 +0100" }, "committer": { "name": "Jens Axboe", "email": "axboe@kernel.dk", "time": "Fri Nov 11 13:29:04 2011 +0100" }, "message": "backing-dev: ensure wakeup_timer is deleted\n\nbdi_prune_sb() in bdi_unregister() attempts to removes the bdi links\nfrom all super_blocks and then del_timer_sync() the writeback timer.\n\nHowever, this can race with __mark_inode_dirty(), leading to\nbdi_wakeup_thread_delayed() rearming the writeback timer on the bdi\nwe\u0027re unregistering, after we\u0027ve called del_timer_sync().\n\nThis can end up with the bdi being freed with an active timer inside it,\nas in the case of the following dump after the removal of an SD card.\n\nFix this by redoing the del_timer_sync() in bdi_destory().\n\n ------------[ cut here ]------------\n WARNING: at /home/rabin/kernel/arm/lib/debugobjects.c:262 debug_print_object+0x9c/0xc8()\n ODEBUG: free active (active state 0) object type: timer_list hint: wakeup_timer_fn+0x0/0x180\n Modules linked in:\n Backtrace:\n [\u003cc00109dc\u003e] (dump_backtrace+0x0/0x110) from [\u003cc0236e4c\u003e] (dump_stack+0x18/0x1c)\n r6:c02bc638 r5:00000106 r4:c79f5d18 r3:00000000\n [\u003cc0236e34\u003e] (dump_stack+0x0/0x1c) from [\u003cc0025e6c\u003e] (warn_slowpath_common+0x54/0x6c)\n [\u003cc0025e18\u003e] (warn_slowpath_common+0x0/0x6c) from [\u003cc0025f28\u003e] (warn_slowpath_fmt+0x38/0x40)\n r8:20000013 r7:c780c6f0 r6:c031613c r5:c780c6f0 r4:c02b1b29\n r3:00000009\n [\u003cc0025ef0\u003e] (warn_slowpath_fmt+0x0/0x40) from [\u003cc015eb4c\u003e] (debug_print_object+0x9c/0xc8)\n r3:c02b1b29 r2:c02bc662\n [\u003cc015eab0\u003e] (debug_print_object+0x0/0xc8) from [\u003cc015f574\u003e] (debug_check_no_obj_freed+0xac/0x1dc)\n r6:c7964000 r5:00000001 r4:c7964000\n [\u003cc015f4c8\u003e] (debug_check_no_obj_freed+0x0/0x1dc) from [\u003cc00a9e38\u003e] (kmem_cache_free+0x88/0x1f8)\n [\u003cc00a9db0\u003e] (kmem_cache_free+0x0/0x1f8) from [\u003cc014286c\u003e] (blk_release_queue+0x70/0x78)\n [\u003cc01427fc\u003e] (blk_release_queue+0x0/0x78) from [\u003cc015290c\u003e] (kobject_release+0x70/0x84)\n r5:c79641f0 r4:c796420c\n [\u003cc015289c\u003e] (kobject_release+0x0/0x84) from [\u003cc0153ce4\u003e] (kref_put+0x68/0x80)\n r7:00000083 r6:c74083d0 r5:c015289c r4:c796420c\n [\u003cc0153c7c\u003e] (kref_put+0x0/0x80) from [\u003cc01527d0\u003e] (kobject_put+0x48/0x5c)\n r5:c79643b4 r4:c79641f0\n [\u003cc0152788\u003e] (kobject_put+0x0/0x5c) from [\u003cc013ddd8\u003e] (blk_cleanup_queue+0x68/0x74)\n r4:c7964000\n [\u003cc013dd70\u003e] (blk_cleanup_queue+0x0/0x74) from [\u003cc01a6370\u003e] (mmc_blk_put+0x78/0xe8)\n r5:00000000 r4:c794c400\n [\u003cc01a62f8\u003e] (mmc_blk_put+0x0/0xe8) from [\u003cc01a64b4\u003e] (mmc_blk_release+0x24/0x38)\n r5:c794c400 r4:c0322824\n [\u003cc01a6490\u003e] (mmc_blk_release+0x0/0x38) from [\u003cc00de11c\u003e] (__blkdev_put+0xe8/0x170)\n r5:c78d5e00 r4:c74083c0\n [\u003cc00de034\u003e] (__blkdev_put+0x0/0x170) from [\u003cc00de2c0\u003e] (blkdev_put+0x11c/0x12c)\n r8:c79f5f70 r7:00000001 r6:c74083d0 r5:00000083 r4:c74083c0\n r3:00000000\n [\u003cc00de1a4\u003e] (blkdev_put+0x0/0x12c) from [\u003cc00b0724\u003e] (kill_block_super+0x60/0x6c)\n r7:c7942300 r6:c79f4000 r5:00000083 r4:c74083c0\n [\u003cc00b06c4\u003e] (kill_block_super+0x0/0x6c) from [\u003cc00b0a94\u003e] (deactivate_locked_super+0x44/0x70)\n r6:c79f4000 r5:c031af64 r4:c794dc00 r3:c00b06c4\n [\u003cc00b0a50\u003e] (deactivate_locked_super+0x0/0x70) from [\u003cc00b1358\u003e] (deactivate_super+0x6c/0x70)\n r5:c794dc00 r4:c794dc00\n [\u003cc00b12ec\u003e] (deactivate_super+0x0/0x70) from [\u003cc00c88b0\u003e] (mntput_no_expire+0x188/0x194)\n r5:c794dc00 r4:c7942300\n [\u003cc00c8728\u003e] (mntput_no_expire+0x0/0x194) from [\u003cc00c95e0\u003e] (sys_umount+0x2e4/0x310)\n r6:c7942300 r5:00000000 r4:00000000 r3:00000000\n [\u003cc00c92fc\u003e] (sys_umount+0x0/0x310) from [\u003cc000d940\u003e] (ret_fast_syscall+0x0/0x30)\n ---[ end trace e5c83c92ada51c76 ]---\n\nCc: stable@kernel.org\nSigned-off-by: Rabin Vincent \u003crabin.vincent@stericsson.com\u003e\nSigned-off-by: Linus Walleij \u003clinus.walleij@linaro.org\u003e\nSigned-off-by: Jens Axboe \u003caxboe@kernel.dk\u003e\n" }, { "commit": "3a73dbbc9bb3fc8594cd67af4db6c563175dfddb", "tree": "e5120c19fd8e83a38d5c0852336a92c5b7862c6a", "parents": [ "31555213f03bca37d2c02e10946296052f4ecfcd" ], "author": { "name": "Wu Fengguang", "email": "fengguang.wu@intel.com", "time": "Mon Nov 07 19:19:28 2011 +0800" }, "committer": { "name": "Wu Fengguang", "email": "fengguang.wu@intel.com", "time": "Mon Nov 07 19:19:28 2011 +0800" }, "message": "writeback: fix uninitialized task_ratelimit\n\nIn balance_dirty_pages() task_ratelimit may be not initialized\n(initialization skiped by goto pause), and then used when calling\ntracing hook.\n\nFix it by moving the task_ratelimit assignment before goto pause.\n\nReported-by: Witold Baryluk \u003cbaryluk@smp.if.uj.edu.pl\u003e\nSigned-off-by: Wu Fengguang \u003cfengguang.wu@intel.com\u003e\n" }, { "commit": "32aaeffbd4a7457bf2f7448b33b5946ff2a960eb", "tree": "faf7ad871d87176423ff9ed1d1ba4d9c688fc23f", "parents": [ "208bca0860406d16398145ddd950036a737c3c9d", "67b84999b1a8b1af5625b1eabe92146c5eb42932" ], "author": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Sun Nov 06 19:44:47 2011 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Sun Nov 06 19:44:47 2011 -0800" }, "message": "Merge branch \u0027modsplit-Oct31_2011\u0027 of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux\n\n* \u0027modsplit-Oct31_2011\u0027 of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux: (230 commits)\n Revert \"tracing: Include module.h in define_trace.h\"\n irq: don\u0027t put module.h into irq.h for tracking irqgen modules.\n bluetooth: macroize two small inlines to avoid module.h\n ip_vs.h: fix implicit use of module_get/module_put from module.h\n nf_conntrack.h: fix up fallout from implicit moduleparam.h presence\n include: replace linux/module.h with \"struct module\" wherever possible\n include: convert various register fcns to macros to avoid include chaining\n crypto.h: remove unused crypto_tfm_alg_modname() inline\n uwb.h: fix implicit use of asm/page.h for PAGE_SIZE\n pm_runtime.h: explicitly requires notifier.h\n linux/dmaengine.h: fix implicit use of bitmap.h and asm/page.h\n miscdevice.h: fix up implicit use of lists and types\n stop_machine.h: fix implicit use of smp.h for smp_processor_id\n of: fix implicit use of errno.h in include/linux/of.h\n of_platform.h: delete needless include \u003clinux/module.h\u003e\n acpi: remove module.h include from platform/aclinux.h\n miscdevice.h: delete unnecessary inclusion of module.h\n device_cgroup.h: delete needless include \u003clinux/module.h\u003e\n net: sch_generic remove redundant use of \u003clinux/module.h\u003e\n net: inet_timewait_sock doesnt need \u003clinux/module.h\u003e\n ...\n\nFix up trivial conflicts (other header files, and removal of the ab3550 mfd driver) in\n - drivers/media/dvb/frontends/dibx000_common.c\n - drivers/media/video/{mt9m111.c,ov6650.c}\n - drivers/mfd/ab3550-core.c\n - include/linux/dmaengine.h\n" }, { "commit": "208bca0860406d16398145ddd950036a737c3c9d", "tree": "7797a16c17d8bd155120126fa7976727fc6de013", "parents": [ "6aad3738f6a79fd0ca480eaceefe064cc471f6eb", "0e175a1835ffc979e55787774e58ec79e41957d7" ], "author": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Sun Nov 06 19:02:23 2011 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Sun Nov 06 19:02:23 2011 -0800" }, "message": "Merge branch \u0027writeback-for-linus\u0027 of git://git.kernel.org/pub/scm/linux/kernel/git/wfg/linux\n\n* \u0027writeback-for-linus\u0027 of git://git.kernel.org/pub/scm/linux/kernel/git/wfg/linux:\n writeback: Add a \u0027reason\u0027 to wb_writeback_work\n writeback: send work item to queue_io, move_expired_inodes\n writeback: trace event balance_dirty_pages\n writeback: trace event bdi_dirty_ratelimit\n writeback: fix ppc compile warnings on do_div(long long, unsigned long)\n writeback: per-bdi background threshold\n writeback: dirty position control - bdi reserve area\n writeback: control dirty pause time\n writeback: limit max dirty pause time\n writeback: IO-less balance_dirty_pages()\n writeback: per task dirty rate limit\n writeback: stabilize bdi-\u003edirty_ratelimit\n writeback: dirty rate control\n writeback: add bg_threshold parameter to __bdi_update_bandwidth()\n writeback: dirty position control\n writeback: account per-bdi accumulated dirtied pages\n" }, { "commit": "b4fdcb02f1e39c27058a885905bd0277370ba441", "tree": "fd4cfd1994f21f44afe5e7904681fb5ac09f81b8", "parents": [ "044595d4e448305fbaec472eb7d22636d24e7d8c", "6dd9ad7df2019b1e33a372a501907db293ebcd0d" ], "author": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Fri Nov 04 17:06:58 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Fri Nov 04 17:06:58 2011 -0700" }, "message": "Merge branch \u0027for-3.2/core\u0027 of git://git.kernel.dk/linux-block\n\n* \u0027for-3.2/core\u0027 of git://git.kernel.dk/linux-block: (29 commits)\n block: don\u0027t call blk_drain_queue() if elevator is not up\n blk-throttle: use queue_is_locked() instead of lockdep_is_held()\n blk-throttle: Take blkcg-\u003elock while traversing blkcg-\u003epolicy_list\n blk-throttle: Free up policy node associated with deleted rule\n block: warn if tag is greater than real_max_depth.\n block: make gendisk hold a reference to its queue\n blk-flush: move the queue kick into\n blk-flush: fix invalid BUG_ON in blk_insert_flush\n block: Remove the control of complete cpu from bio.\n block: fix a typo in the blk-cgroup.h file\n block: initialize the bounce pool if high memory may be added later\n block: fix request_queue lifetime handling by making blk_queue_cleanup() properly shutdown\n block: drop @tsk from attempt_plug_merge() and explain sync rules\n block: make get_request[_wait]() fail if queue is dead\n block: reorganize throtl_get_tg() and blk_throtl_bio()\n block: reorganize queue draining\n block: drop unnecessary blk_get/put_queue() in scsi_cmd_ioctl() and blk_get_tg()\n block: pass around REQ_* flags instead of broken down booleans during request alloc/free\n block: move blk_throtl prototypes to block/blk.h\n block: fix genhd refcounting in blkio_policy_parse_and_set()\n ...\n\nFix up trivial conflicts due to \"mddev_t\" -\u003e \"struct mddev\" conversion\nand making the request functions be of type \"void\" instead of \"int\" in\n - drivers/md/{faulty.c,linear.c,md.c,md.h,multipath.c,raid0.c,raid1.c,raid10.c,raid5.c}\n - drivers/staging/zram/zram_drv.c\n" }, { "commit": "092f4c56c1927e4b61a41ee8055005f1cb437009", "tree": "616ceb54b7671ccc13922ae9e002b8b972f6e09e", "parents": [ "80c2861672bbf000f6af838656959ee937e4ee4d", "c1e2ee2dc436574880758b3836fc96935b774c32" ], "author": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Wed Nov 02 16:07:27 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Wed Nov 02 16:07:27 2011 -0700" }, "message": "Merge branch \u0027akpm\u0027 (Andrew\u0027s incoming - part two)\n\nSays Andrew:\n\n \"60 patches. That\u0027s good enough for -rc1 I guess. I have quite a lot\n of detritus to be rechecked, work through maintainers, etc.\n\n - most of the remains of MM\n - rtc\n - various misc\n - cgroups\n - memcg\n - cpusets\n - procfs\n - ipc\n - rapidio\n - sysctl\n - pps\n - w1\n - drivers/misc\n - aio\"\n\n* akpm: (60 commits)\n memcg: replace ss-\u003eid_lock with a rwlock\n aio: allocate kiocbs in batches\n drivers/misc/vmw_balloon.c: fix typo in code comment\n drivers/misc/vmw_balloon.c: determine page allocation flag can_sleep outside loop\n w1: disable irqs in critical section\n drivers/w1/w1_int.c: multiple masters used same init_name\n drivers/power/ds2780_battery.c: fix deadlock upon insertion and removal\n drivers/power/ds2780_battery.c: add a nolock function to w1 interface\n drivers/power/ds2780_battery.c: create central point for calling w1 interface\n w1: ds2760 and ds2780, use ida for id and ida_simple_get() to get it\n pps gpio client: add missing dependency\n pps: new client driver using GPIO\n pps: default echo function\n include/linux/dma-mapping.h: add dma_zalloc_coherent()\n sysctl: make CONFIG_SYSCTL_SYSCALL default to n\n sysctl: add support for poll()\n RapidIO: documentation update\n drivers/net/rionet.c: fix ethernet address macros for LE platforms\n RapidIO: fix potential null deref in rio_setup_device()\n RapidIO: add mport driver for Tsi721 bridge\n ...\n" }, { "commit": "61600f578fbd2e8ad0c90bddb9c729e7628d3813", "tree": "25842f7e2ee743c66e30df1de3cb666d48bbd063", "parents": [ "4799401fef9d5951b2da384c5eb08034c48e08a0" ], "author": { "name": "H Hartley Sweeten", "email": "hartleys@visionengravers.com", "time": "Wed Nov 02 13:38:36 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Wed Nov 02 16:07:00 2011 -0700" }, "message": "mm/page_cgroup.c: quiet sparse noise\n\nwarning: symbol \u0027swap_cgroup_ctrl\u0027 was not declared. Should it be static?\n\nSigned-off-by: H Hartley Sweeten \u003chsweeten@visionengravers.com\u003e\nCc: Paul Menage \u003cpaul@paulmenage.org\u003e\nCc: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nAcked-by: Balbir Singh \u003cbsingharora@gmail.com\u003e\nCc: Daisuke Nishimura \u003cnishimura@mxp.nes.nec.co.jp\u003e\nAcked-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": "4799401fef9d5951b2da384c5eb08034c48e08a0", "tree": "94f9113c6870f46811aaa0f08cdb3ca2beba1e9c", "parents": [ "a61ed3cec51cfd4877855c24890ab8d3e2b143e3" ], "author": { "name": "Steven Rostedt", "email": "srostedt@redhat.com", "time": "Wed Nov 02 13:38:33 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Wed Nov 02 16:07:00 2011 -0700" }, "message": "memcg: Fix race condition in memcg_check_events() with this_cpu usage\n\nVarious code in memcontrol.c () calls this_cpu_read() on the calculations\nto be done from two different percpu variables, or does an open-coded\nread-modify-write on a single percpu variable.\n\nDisable preemption throughout these operations so that the writes go to\nthe correct palces.\n\n[hannes@cmpxchg.org: added this_cpu to __this_cpu conversion]\nSigned-off-by: Johannes Weiner \u003channes@cmpxchg.org\u003e\nSigned-off-by: Steven Rostedt \u003crostedt@goodmis.org\u003e\nCc: Greg Thelen \u003cgthelen@google.com\u003e\nCc: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nCc: Balbir Singh \u003cbalbir@linux.vnet.ibm.com\u003e\nCc: Daisuke Nishimura \u003cnishimura@mxp.nes.nec.co.jp\u003e\nCc: Thomas Gleixner \u003ctglx@linutronix.de\u003e\nCc: Peter Zijlstra \u003cpeterz@infradead.org\u003e\nCc: 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": "a61ed3cec51cfd4877855c24890ab8d3e2b143e3", "tree": "3ffb850513b202c8eb0ac09ad6d307719bd39856", "parents": [ "9b272977e3b99a8699361d214b51f98c8a9e0e7b" ], "author": { "name": "Johannes Weiner", "email": "jweiner@redhat.com", "time": "Wed Nov 02 13:38:29 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Wed Nov 02 16:07:00 2011 -0700" }, "message": "memcg: close race between charge and putback\n\nThere is a potential race between a thread charging a page and another\nthread putting it back to the LRU list:\n\n charge: putback:\n SetPageCgroupUsed SetPageLRU\n PageLRU \u0026\u0026 add to memcg LRU PageCgroupUsed \u0026\u0026 add to memcg LRU\n\nThe order of setting one flag and checking the other is crucial, otherwise\nthe charge may observe !PageLRU while the putback observes !PageCgroupUsed\nand the page is not linked to the memcg LRU at all.\n\nGlobal memory pressure may fix this by trying to isolate and putback the\npage for reclaim, where that putback would link it to the memcg LRU again.\n Without that, the memory cgroup is undeletable due to a charge whose\nphysical page can not be found and moved out.\n\nSigned-off-by: Johannes Weiner \u003cjweiner@redhat.com\u003e\nCc: Ying Han \u003cyinghan@google.com\u003e\nAcked-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nCc: Daisuke Nishimura \u003cnishimura@mxp.nes.nec.co.jp\u003e\nCc: Balbir Singh \u003cbsingharora@gmail.com\u003e\nCc: Michal Hocko \u003cmhocko@suse.cz\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "9b272977e3b99a8699361d214b51f98c8a9e0e7b", "tree": "2113cee95a42ea893aa6eddb01b14e563153fabb", "parents": [ "0a619e58703b86d53d07e938eade9a91a4a863c6" ], "author": { "name": "Johannes Weiner", "email": "jweiner@redhat.com", "time": "Wed Nov 02 13:38:23 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Wed Nov 02 16:07:00 2011 -0700" }, "message": "memcg: skip scanning active lists based on individual size\n\nReclaim decides to skip scanning an active list when the corresponding\ninactive list is above a certain size in comparison to leave the assumed\nworking set alone while there are still enough reclaim candidates around.\n\nThe memcg implementation of comparing those lists instead reports whether\nthe whole memcg is low on the requested type of inactive pages,\nconsidering all nodes and zones.\n\nThis can lead to an oversized active list not being scanned because of the\nstate of the other lists in the memcg, as well as an active list being\nscanned while its corresponding inactive list has enough pages.\n\nNot only is this wrong, it\u0027s also a scalability hazard, because the global\nmemory state over all nodes and zones has to be gathered for each memcg\nand zone scanned.\n\nMake these calculations purely based on the size of the two LRU lists\nthat are actually affected by the outcome of the decision.\n\nSigned-off-by: Johannes Weiner \u003cjweiner@redhat.com\u003e\nReviewed-by: Rik van Riel \u003criel@redhat.com\u003e\nCc: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nAcked-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nCc: Daisuke Nishimura \u003cnishimura@mxp.nes.nec.co.jp\u003e\nCc: Balbir Singh \u003cbsingharora@gmail.com\u003e\nReviewed-by: Minchan Kim \u003cminchan.kim@gmail.com\u003e\nReviewed-by: Ying Han \u003cyinghan@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": "0a619e58703b86d53d07e938eade9a91a4a863c6", "tree": "0579cebdbdbb90507db04b320acb4191f8a86f2e", "parents": [ "715a5ee82ab3c07430f748630044354132add5ad" ], "author": { "name": "Igor Mammedov", "email": "imammedo@redhat.com", "time": "Wed Nov 02 13:38:21 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Wed Nov 02 16:07:00 2011 -0700" }, "message": "memcg: do not expose uninitialized mem_cgroup_per_node to world\n\nIf somebody is touching data too early, it might be easier to diagnose a\nproblem when dereferencing NULL at mem-\u003einfo.nodeinfo[node] than trying to\nunderstand why mem_cgroup_per_zone is [un|partly]initialized.\n\nSigned-off-by: Igor Mammedov \u003cimammedo@redhat.com\u003e\nAcked-by: Michal Hocko \u003cmhocko@suse.cz\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": "715a5ee82ab3c07430f748630044354132add5ad", "tree": "f77a20fbcd0e19dcb3b65f511194e01e8095bf6a", "parents": [ "c0ff4b8540a5c158b8e5bafb7d767298b67b0b92" ], "author": { "name": "KAMEZAWA Hiroyuki", "email": "kamezawa.hiroyu@jp.fujitsu.com", "time": "Wed Nov 02 13:38:18 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Wed Nov 02 16:06:59 2011 -0700" }, "message": "memcg: fix oom schedule_timeout()\n\nBefore calling schedule_timeout(), task state should be changed.\n\nSigned-off-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nAcked-by: Michal Hocko \u003cmhocko@suse.cz\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "c0ff4b8540a5c158b8e5bafb7d767298b67b0b92", "tree": "a47a2bcd0b7b80056cde7ba6b1263aae78f77212", "parents": [ "ff7ee93f47151e23601856e7eb5510babf956571" ], "author": { "name": "Raghavendra K T", "email": "raghavendra.kt@linux.vnet.ibm.com", "time": "Wed Nov 02 13:38:15 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Wed Nov 02 16:06:59 2011 -0700" }, "message": "memcg: rename mem variable to memcg\n\nThe memcg code sometimes uses \"struct mem_cgroup *mem\" and sometimes uses\n\"struct mem_cgroup *memcg\". Rename all mem variables to memcg in source\nfile.\n\nSigned-off-by: Raghavendra K T \u003craghavendra.kt@linux.vnet.ibm.com\u003e\nAcked-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nAcked-by: Michal Hocko \u003cmhocko@suse.cz\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "ff7ee93f47151e23601856e7eb5510babf956571", "tree": "2a62777ebdec1383d3dd6098cfe8a325c99f2dde", "parents": [ "77ceab8ea590d7dc6c8f055ce43dfebd74428107" ], "author": { "name": "Steven Rostedt", "email": "rostedt@goodmis.org", "time": "Wed Nov 02 13:38:11 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Wed Nov 02 16:06:59 2011 -0700" }, "message": "cgroup/kmemleak: Annotate alloc_page() for cgroup allocations\n\nWhen the cgroup base was allocated with kmalloc, it was necessary to\nannotate the variable with kmemleak_not_leak(). But because it has\nrecently been changed to be allocated with alloc_page() (which skips\nkmemleak checks) causes a warning on boot up.\n\nI was triggering this output:\n\n allocated 8388608 bytes of page_cgroup\n please try \u0027cgroup_disable\u003dmemory\u0027 option if you don\u0027t want memory cgroups\n kmemleak: Trying to color unknown object at 0xf5840000 as Grey\n Pid: 0, comm: swapper Not tainted 3.0.0-test #12\n Call Trace:\n [\u003cc17e34e6\u003e] ? printk+0x1d/0x1f^M\n [\u003cc10e2941\u003e] paint_ptr+0x4f/0x78\n [\u003cc178ab57\u003e] kmemleak_not_leak+0x58/0x7d\n [\u003cc108ae9f\u003e] ? __rcu_read_unlock+0x9/0x7d\n [\u003cc1cdb462\u003e] kmemleak_init+0x19d/0x1e9\n [\u003cc1cbf771\u003e] start_kernel+0x346/0x3ec\n [\u003cc1cbf1b4\u003e] ? loglevel+0x18/0x18\n [\u003cc1cbf0aa\u003e] i386_start_kernel+0xaa/0xb0\n\nAfter a bit of debugging I tracked the object 0xf840000 (and others) down\nto the cgroup code. The change from allocating base with kmalloc to\nalloc_page() has the base not calling kmemleak_alloc() which adds the\npointer to the object_tree_root, but kmemleak_not_leak() adds it to the\ncrt_early_log[] table. On kmemleak_init(), the entry is found in the\nearly_log[] but not the object_tree_root, and this error message is\ndisplayed.\n\nIf alloc_page() fails then it defaults back to vmalloc() which still uses\nthe kmemleak_alloc() which makes us still need the kmemleak_not_leak()\ncall. The solution is to call the kmemleak_alloc() directly if the\nalloc_page() succeeds.\n\nReviewed-by: Michal Hocko \u003cmhocko@suse.cz\u003e\nSigned-off-by: Steven Rostedt \u003crostedt@goodmis.org\u003e\nAcked-by: Catalin Marinas \u003ccatalin.marinas@arm.com\u003e\nSigned-off-by: Jonathan Nieder \u003cjrnieder@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": "70b50f94f1644e2aa7cb374819cfd93f3c28d725", "tree": "79198cd9a92600140827a670d1ed5eefdcd23d79", "parents": [ "994c0e992522c123298b4a91b72f5e67ba2d1123" ], "author": { "name": "Andrea Arcangeli", "email": "aarcange@redhat.com", "time": "Wed Nov 02 13:36:59 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Wed Nov 02 16:06:57 2011 -0700" }, "message": "mm: thp: tail page refcounting fix\n\nMichel while working on the working set estimation code, noticed that\ncalling get_page_unless_zero() on a random pfn_to_page(random_pfn)\nwasn\u0027t safe, if the pfn ended up being a tail page of a transparent\nhugepage under splitting by __split_huge_page_refcount().\n\nHe then found the problem could also theoretically materialize with\npage_cache_get_speculative() during the speculative radix tree lookups\nthat uses get_page_unless_zero() in SMP if the radix tree page is freed\nand reallocated and get_user_pages is called on it before\npage_cache_get_speculative has a chance to call get_page_unless_zero().\n\nSo the best way to fix the problem is to keep page_tail-\u003e_count zero at\nall times. This will guarantee that get_page_unless_zero() can never\nsucceed on any tail page. page_tail-\u003e_mapcount is guaranteed zero and\nis unused for all tail pages of a compound page, so we can simply\naccount the tail page references there and transfer them to\ntail_page-\u003e_count in __split_huge_page_refcount() (in addition to the\nhead_page-\u003e_mapcount).\n\nWhile debugging this s/_count/_mapcount/ change I also noticed get_page is\ncalled by direct-io.c on pages returned by get_user_pages. That wasn\u0027t\nentirely safe because the two atomic_inc in get_page weren\u0027t atomic. As\nopposed to other get_user_page users like secondary-MMU page fault to\nestablish the shadow pagetables would never call any superflous get_page\nafter get_user_page returns. It\u0027s safer to make get_page universally safe\nfor tail pages and to use get_page_foll() within follow_page (inside\nget_user_pages()). get_page_foll() is safe to do the refcounting for tail\npages without taking any locks because it is run within PT lock protected\ncritical sections (PT lock for pte and page_table_lock for\npmd_trans_huge).\n\nThe standard get_page() as invoked by direct-io instead will now take\nthe compound_lock but still only for tail pages. The direct-io paths\nare usually I/O bound and the compound_lock is per THP so very\nfinegrined, so there\u0027s no risk of scalability issues with it. A simple\ndirect-io benchmarks with all lockdep prove locking and spinlock\ndebugging infrastructure enabled shows identical performance and no\noverhead. So it\u0027s worth it. Ideally direct-io should stop calling\nget_page() on pages returned by get_user_pages(). The spinlock in\nget_page() is already optimized away for no-THP builds but doing\nget_page() on tail pages returned by GUP is generally a rare operation\nand usually only run in I/O paths.\n\nThis new refcounting on page_tail-\u003e_mapcount in addition to avoiding new\nRCU critical sections will also allow the working set estimation code to\nwork without any further complexity associated to the tail page\nrefcounting with THP.\n\nSigned-off-by: Andrea Arcangeli \u003caarcange@redhat.com\u003e\nReported-by: Michel Lespinasse \u003cwalken@google.com\u003e\nReviewed-by: Michel Lespinasse \u003cwalken@google.com\u003e\nReviewed-by: Minchan Kim \u003cminchan.kim@gmail.com\u003e\nCc: Peter Zijlstra \u003ca.p.zijlstra@chello.nl\u003e\nCc: Hugh Dickins \u003chughd@google.com\u003e\nCc: Johannes Weiner \u003cjweiner@redhat.com\u003e\nCc: Rik van Riel \u003criel@redhat.com\u003e\nCc: Mel Gorman \u003cmgorman@suse.de\u003e\nCc: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nCc: Benjamin Herrenschmidt \u003cbenh@kernel.crashing.org\u003e\nCc: David Gibson \u003cdavid@gibson.dropbear.id.au\u003e\nCc: \u003cstable@kernel.org\u003e\nCc: \u003cstable@vger.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": "6d6b77f163c7eabedbba00ed2abb7d4a570bff76", "tree": "6ce074a7dd5a25fae28ef9de6f59ddee08ea4e61", "parents": [ "dd2a981f46a0903a8770a784f213d4d40bbb6f19" ], "author": { "name": "Miklos Szeredi", "email": "mszeredi@suse.cz", "time": "Fri Oct 28 14:13:28 2011 +0200" }, "committer": { "name": "Christoph Hellwig", "email": "hch@serles.lst.de", "time": "Wed Nov 02 12:53:43 2011 +0100" }, "message": "filesystems: add missing nlink wrappers\n\nReplace direct i_nlink updates with the respective updater function\n(inc_nlink, drop_nlink, clear_nlink, inode_dec_link_count).\n\nSigned-off-by: Miklos Szeredi \u003cmszeredi@suse.cz\u003e\n" }, { "commit": "a1cb2c60ddc98ff4e5246f410558805401ceee67", "tree": "49e3e620ff2974dc78fad8df0b343b07b75be407", "parents": [ "3d470fc385defa60d9af610f05db8e7f8b4f2f5e" ], "author": { "name": "Dimitri Sivanich", "email": "sivanich@sgi.com", "time": "Mon Oct 31 17:09:46 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 31 17:30:51 2011 -0700" }, "message": "mm/vmstat.c: cache align vm_stat\n\nAvoid false sharing of the vm_stat array.\n\nThis was found to adversely affect tmpfs I/O performance.\n\nTests run on a 640 cpu UV system.\n\nWith 120 threads doing parallel writes, each to different tmpfs mounts:\nNo patch:\t\t~300 MB/sec\nWith vm_stat alignment:\t~430 MB/sec\n\nSigned-off-by: Dimitri Sivanich \u003csivanich@sgi.com\u003e\nAcked-by: Christoph Lameter \u003ccl@gentwo.org\u003e\nAcked-by: 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": "3d470fc385defa60d9af610f05db8e7f8b4f2f5e", "tree": "8db16148d94a2ae2723e209e0f2d7fe026361972", "parents": [ "35d8c7ad7208dad5d352c483408e555022750978" ], "author": { "name": "Hugh Dickins", "email": "hughd@google.com", "time": "Mon Oct 31 17:09:43 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 31 17:30:51 2011 -0700" }, "message": "mm: munlock use mapcount to avoid terrible overhead\n\nA process spent 30 minutes exiting, just munlocking the pages of a large\nanonymous area that had been alternately mprotected into page-sized vmas:\nfor every single page there\u0027s an anon_vma walk through all the other\nlittle vmas to find the right one.\n\nA general fix to that would be a lot more complicated (use prio_tree on\nanon_vma?), but there\u0027s one very simple thing we can do to speed up the\ncommon case: if a page to be munlocked is mapped only once, then it is our\nvma that it is mapped into, and there\u0027s no need whatever to walk through\nall the others.\n\nOkay, there is a very remote race in munlock_vma_pages_range(), if between\nits follow_page() and lock_page(), another process were to munlock the\nsame page, then page reclaim remove it from our vma, then another process\nmlock it again. We would find it with page_mapcount 1, yet it\u0027s still\nmlocked in another process. But never mind, that\u0027s much less likely than\nthe down_read_trylock() failure which munlocking already tolerates (in\ntry_to_unmap_one()): in due course page reclaim will discover and move the\npage to unevictable instead.\n\n[akpm@linux-foundation.org: add comment]\nSigned-off-by: Hugh Dickins \u003chughd@google.com\u003e\nCc: Michel Lespinasse \u003cwalken@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": "35d8c7ad7208dad5d352c483408e555022750978", "tree": "19de03a943fb00f7ed239147256aa558ddfd99b3", "parents": [ "0089e4853ae1ac161fae5137170971ccb6f4f152" ], "author": { "name": "Hillf Danton", "email": "dhillf@gmail.com", "time": "Mon Oct 31 17:09:40 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 31 17:30:51 2011 -0700" }, "message": "mm/huge_memory: fix typo when updating mmu cache\n\nThere are three cases of update_mmu_cache() in the file, and the case in\nfunction collapse_huge_page() has a typo, namely the last parameter used,\nwhich is corrected based on the other two cases.\n\nDue to the define of update_mmu_cache by X86, the only arch that\nimplements THP currently, the change here has no really crystal point, but\none or two minutes of efforts could be saved for those archs that are\nlikely to support THP in future.\n\nSigned-off-by: Hillf Danton \u003cdhillf@gmail.com\u003e\nCc: Johannes Weiner \u003cjweiner@redhat.com\u003e\nReviewed-by: Andrea Arcangeli \u003caarcange@redhat.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "0089e4853ae1ac161fae5137170971ccb6f4f152", "tree": "6e23993f320cd6b0d45a5fb4832188cd2092efe2", "parents": [ "df9d6985be2a7e7683c46e4c6ea608fc69f02b45" ], "author": { "name": "Hillf Danton", "email": "dhillf@gmail.com", "time": "Mon Oct 31 17:09:38 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 31 17:30:50 2011 -0700" }, "message": "mm/huge_memory: fix copying user highpage\n\nThe THP copy-on-write handler falls back to regular-sized pages for a huge\npage replacement upon allocation failure or if THP has been individually\ndisabled in the target VMA. The loop responsible for copying page-sized\nchunks accidentally uses multiples of PAGE_SHIFT instead of PAGE_SIZE as\nthe virtual address arg for copy_user_highpage().\n\nSigned-off-by: Hillf Danton \u003cdhillf@gmail.com\u003e\nAcked-by: Johannes Weiner \u003cjweiner@redhat.com\u003e\nReviewed-by: Andrea Arcangeli \u003caarcange@redhat.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "df9d6985be2a7e7683c46e4c6ea608fc69f02b45", "tree": "81bcf7cfbc842a7eee7aa18104a1fbecd2d316e8", "parents": [ "e0c23279c9f800c403f37511484d9014ac83adec" ], "author": { "name": "Christoph Lameter", "email": "cl@gentwo.org", "time": "Mon Oct 31 17:09:35 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 31 17:30:50 2011 -0700" }, "message": "mm: do not drain pagevecs for mlockall(MCL_FUTURE)\n\nMCL_FUTURE does not move pages between lru list and draining the LRU per\ncpu pagevecs is a nasty activity. Avoid doing it unecessarily.\n\nSigned-off-by: Christoph Lameter \u003ccl@gentwo.org\u003e\nCc: David Rientjes \u003crientjes@google.com\u003e\nReviewed-by: Minchan Kim \u003cminchan.kim@gmail.com\u003e\nAcked-by: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nCc: Mel Gorman \u003cmel@csn.ul.ie\u003e\nAcked-by: Johannes Weiner \u003cjweiner@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": "e0c23279c9f800c403f37511484d9014ac83adec", "tree": "9dcf058d3d1c691328ea5839dfe9c340e47ee3fa", "parents": [ "e0887c19b2daa140f20ca8104bdc5740f39dbb86" ], "author": { "name": "Mel Gorman", "email": "mgorman@suse.de", "time": "Mon Oct 31 17:09:33 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 31 17:30:50 2011 -0700" }, "message": "vmscan: abort reclaim/compaction if compaction can proceed\n\nIf compaction can proceed, shrink_zones() stops doing any work but its\ncallers still call shrink_slab() which raises the priority and potentially\nsleeps. This is unnecessary and wasteful so this patch aborts direct\nreclaim/compaction entirely if compaction can proceed.\n\nSigned-off-by: Mel Gorman \u003cmgorman@suse.de\u003e\nAcked-by: Rik van Riel \u003criel@redhat.com\u003e\nReviewed-by: Minchan Kim \u003cminchan.kim@gmail.com\u003e\nAcked-by: Johannes Weiner \u003cjweiner@redhat.com\u003e\nCc: Josh Boyer \u003cjwboyer@redhat.com\u003e\nCc: Andrea Arcangeli \u003caarcange@redhat.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "e0887c19b2daa140f20ca8104bdc5740f39dbb86", "tree": "86330414eb04b5989e68661c205aa52d46ca7ebf", "parents": [ "21ee9f398be209ccbb62929d35961ca1ed48eec3" ], "author": { "name": "Rik van Riel", "email": "riel@redhat.com", "time": "Mon Oct 31 17:09:31 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 31 17:30:50 2011 -0700" }, "message": "vmscan: limit direct reclaim for higher order allocations\n\nWhen suffering from memory fragmentation due to unfreeable pages, THP page\nfaults will repeatedly try to compact memory. Due to the unfreeable\npages, compaction fails.\n\nNeedless to say, at that point page reclaim also fails to create free\ncontiguous 2MB areas. However, that doesn\u0027t stop the current code from\ntrying, over and over again, and freeing a minimum of 4MB (2UL \u003c\u003c\nsc-\u003eorder pages) at every single invocation.\n\nThis resulted in my 12GB system having 2-3GB free memory, a corresponding\namount of used swap and very sluggish response times.\n\nThis can be avoided by having the direct reclaim code not reclaim from\nzones that already have plenty of free memory available for compaction.\n\nIf compaction still fails due to unmovable memory, doing additional\nreclaim will only hurt the system, not help.\n\n[jweiner@redhat.com: change comment to explain the order check]\nSigned-off-by: Rik van Riel \u003criel@redhat.com\u003e\nAcked-by: Johannes Weiner \u003cjweiner@redhat.com\u003e\nAcked-by: Mel Gorman \u003cmgorman@suse.de\u003e\nCc: Andrea Arcangeli \u003caarcange@redhat.com\u003e\nReviewed-by: Minchan Kim \u003cminchan.kim@gmail.com\u003e\nSigned-off-by: Johannes Weiner \u003cjweiner@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": "21ee9f398be209ccbb62929d35961ca1ed48eec3", "tree": "4127e14f4a07a2cb7bc6eb902e9c7b0baab8e84f", "parents": [ "2f1da6421570d064a94e17190a4955c2df99794d" ], "author": { "name": "Minchan Kim", "email": "minchan.kim@gmail.com", "time": "Mon Oct 31 17:09:28 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 31 17:30:50 2011 -0700" }, "message": "vmscan: add barrier to prevent evictable page in unevictable list\n\nWhen a race between putback_lru_page() and shmem_lock with lock\u003d0 happens,\nprogrom execution order is as follows, but clear_bit in processor #1 could\nbe reordered right before spin_unlock of processor #1. Then, the page\nwould be stranded on the unevictable list.\n\nspin_lock\nSetPageLRU\nspin_unlock\n clear_bit(AS_UNEVICTABLE)\n spin_lock\n if PageLRU()\n if !test_bit(AS_UNEVICTABLE)\n \tmove evictable list\nsmp_mb\nif !test_bit(AS_UNEVICTABLE)\n move evictable list\n spin_unlock\n\nBut, pagevec_lookup() in scan_mapping_unevictable_pages() has\nrcu_read_[un]lock() so it could protect reordering before reaching\ntest_bit(AS_UNEVICTABLE) on processor #1 so this problem never happens.\nBut it\u0027s a unexpected side effect and we should solve this problem\nproperly.\n\nThis patch adds a barrier after mapping_clear_unevictable.\n\nI didn\u0027t meet this problem but just found during review.\n\nSigned-off-by: Minchan Kim \u003cminchan.kim@gmail.com\u003e\nAcked-by: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nCc: Mel Gorman \u003cmel@csn.ul.ie\u003e\nCc: Rik van Riel \u003criel@redhat.com\u003e\nCc: Lee Schermerhorn \u003clee.schermerhorn@hp.com\u003e\nAcked-by: Johannes Weiner \u003cjweiner@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": "2f1da6421570d064a94e17190a4955c2df99794d", "tree": "8d382dfd9a264aa698131d4ae2a345ba3fb25794", "parents": [ "e754d79d35f0b8612445a9bd7491c48d7317e3ad" ], "author": { "name": "H Hartley Sweeten", "email": "hartleys@visionengravers.com", "time": "Mon Oct 31 17:09:25 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 31 17:30:50 2011 -0700" }, "message": "mm/huge_memory.c: quiet sparse noise\n\nQuiet the sparse noise:\n\nwarning: symbol \u0027khugepaged_scan\u0027 was not declared. Should it be static?\nwarning: context imbalance in \u0027khugepaged_scan_mm_slot\u0027 - unexpected unlock\n\nSigned-off-by: H Hartley Sweeten \u003chsweeten@visionengravers.com\u003e\nCc: Andrea Arcangeli \u003caarcange@redhat.com\u003e\nCc: Rik van Riel \u003criel@redhat.com\u003e\nCc: Johannes Weiner \u003cjweiner@redhat.com\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": "e754d79d35f0b8612445a9bd7491c48d7317e3ad", "tree": "6ba53676ba3b425144b7723793e9cda6581a6790", "parents": [ "22d5368a0838c00ed0e3ec20e7ff8c6e46ba99ef" ], "author": { "name": "H Hartley Sweeten", "email": "hartleys@visionengravers.com", "time": "Mon Oct 31 17:09:23 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 31 17:30:50 2011 -0700" }, "message": "mm/mempolicy.c: quiet sparse noise\n\nQuiet the spares noise:\n\nwarning: symbol \u0027default_policy\u0027 was not declared. Should it be static?\n\nSigned-off-by: H Hartley Sweeten \u003chsweeten@visionengravers.com\u003e\nCc: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nCc: Stephen Wilson \u003cwilsons@start.ca\u003e\nCc: Andrea Arcangeli \u003caarcange@redhat.com\u003e\nCc: Mel Gorman \u003cmel@csn.ul.ie\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "22d5368a0838c00ed0e3ec20e7ff8c6e46ba99ef", "tree": "9692d1a53240795454d46e8cd7abbd0c7002dfa0", "parents": [ "2d7d3eb2bad116e0d1b3b3930a923c55f6d0f70e" ], "author": { "name": "H Hartley Sweeten", "email": "hartleys@visionengravers.com", "time": "Mon Oct 31 17:09:19 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 31 17:30:50 2011 -0700" }, "message": "mm/thrash.c: quiet sparse noise\n\nQuiet the following sparse noise:\n\nwarning: symbol \u0027swap_token_memcg\u0027 was not declared. Should it be static?\n\nSigned-off-by: H Hartley Sweeten \u003chsweeten@visionengravers.com\u003e\nCc: Rik van Riel \u003criel@redhat.com\u003e\nCc: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\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": "2d7d3eb2bad116e0d1b3b3930a923c55f6d0f70e", "tree": "ace773565549cc0b97657654983701b6ea5f9f55", "parents": [ "264e56d8247ef6e31ed4386926cae86c61ddcb18" ], "author": { "name": "H Hartley Sweeten", "email": "hartleys@visionengravers.com", "time": "Mon Oct 31 17:09:15 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 31 17:30:50 2011 -0700" }, "message": "mm/memblock.c: quiet sparse noise\n\nQuiet the following sparse noise in this file:\n\nwarning: symbol \u0027memblock_overlaps_region\u0027 was not declared. Should it be static?\n\nSigned-off-by: H Hartley Sweeten \u003chsweeten@visionengravers,com\u003e\nCc: Yinghai Lu \u003cyinghai@kernel.org\u003e\nCc: \"H. Peter Anvin\" \u003chpa@linux.intel.com\u003e\nCc: Benjamin Herrenschmidt \u003cbenh@kernel.crashing.org\u003e\nCc: Tomi Valkeinen \u003ctomi.valkeinen@nokia.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "264e56d8247ef6e31ed4386926cae86c61ddcb18", "tree": "87e85ee670fb7ae4c0cd7bdeae700faff021bf48", "parents": [ "3f380998aeb51b99d5d22cadb41162e1e9db70d2" ], "author": { "name": "Johannes Weiner", "email": "jweiner@redhat.com", "time": "Mon Oct 31 17:09:13 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 31 17:30:49 2011 -0700" }, "message": "mm: disable user interface to manually rescue unevictable pages\n\nAt one point, anonymous pages were supposed to go on the unevictable list\nwhen no swap space was configured, and the idea was to manually rescue\nthose pages after adding swap and making them evictable again. But\nnowadays, swap-backed pages on the anon LRU list are not scanned without\navailable swap space anyway, so there is no point in moving them to a\nseparate list anymore.\n\nThe manual rescue could also be used in case pages were stranded on the\nunevictable list due to race conditions. But the code has been around for\na while now and newly discovered bugs should be properly reported and\ndealt with instead of relying on such a manual fixup.\n\nIn addition to the lack of a usecase, the sysfs interface to rescue pages\nfrom a specific NUMA node has been broken since its introduction, so it\u0027s\nunlikely that anybody ever relied on that.\n\nThis patch removes the functionality behind the sysctl and the\nnode-interface and emits a one-time warning when somebody tries to access\neither of them.\n\nSigned-off-by: Johannes Weiner \u003cjweiner@redhat.com\u003e\nReported-by: Kautuk Consul \u003cconsul.kautuk@gmail.com\u003e\nReviewed-by: Minchan Kim \u003cminchan.kim@gmail.com\u003e\nAcked-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": "3f380998aeb51b99d5d22cadb41162e1e9db70d2", "tree": "1d5bb20368b06c7b86e7257771209795bd764f00", "parents": [ "4e9dc5df46001510ebd3b3e54faa650f474e51a3" ], "author": { "name": "Kautuk Consul", "email": "consul.kautuk@gmail.com", "time": "Mon Oct 31 17:09:11 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 31 17:30:49 2011 -0700" }, "message": "vmscan.c: fix invalid strict_strtoul() check in write_scan_unevictable_node()\n\nwrite_scan_unevictable_node() checks the value req returned by\nstrict_strtoul() and returns 1 if req is 0.\n\nHowever, when strict_strtoul() returns 0, it means successful conversion\nof buf to unsigned long.\n\nDue to this, the function was not proceeding to scan the zones for\nunevictable pages even though we write a valid value to the\nscan_unevictable_pages sys file.\n\nChange this check slightly to check for invalid value in buf as well as 0\nvalue stored in res after successful conversion via strict_strtoul. In\nboth cases, we do not perform the scanning of this node\u0027s zones.\n\nSigned-off-by: Kautuk Consul \u003cconsul.kautuk@gmail.com\u003e\nReviewed-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nCc: Johannes Weiner \u003cjweiner@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": "4e9dc5df46001510ebd3b3e54faa650f474e51a3", "tree": "a774cae0bbf399401c6d3068859e4a8fe36ee121", "parents": [ "d43a87e68e9e71d2987a29cc239acec4e8f410c9" ], "author": { "name": "Li Haifeng", "email": "omycle@gmail.com", "time": "Mon Oct 31 17:09:09 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 31 17:30:49 2011 -0700" }, "message": "mm: fix kunmap_high() comment\n\nSigned-off-by: Li Haifeng \u003comycle@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": "d43a87e68e9e71d2987a29cc239acec4e8f410c9", "tree": "75b2950b286dcad4c4e7785f991ab0a35146b8d1", "parents": [ "dd73e85f6d8f721d66bcbd2734a5f4bc3d3cd768" ], "author": { "name": "Kyungmin Park", "email": "kyungmin.park@samsung.com", "time": "Mon Oct 31 17:09:08 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 31 17:30:49 2011 -0700" }, "message": "mm: compaction: make compact_zone_order() static\n\nThere\u0027s no compact_zone_order() user outside file scope, so make it static.\n\nSigned-off-by: Kyungmin Park \u003ckyungmin.park@samsung.com\u003e\nAcked-by: David Rientjes \u003crientjes@google.com\u003e\nReviewed-by: 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": "dd73e85f6d8f721d66bcbd2734a5f4bc3d3cd768", "tree": "a39776b9025de8baf6a346a43db1aee9bbafad08", "parents": [ "72a2ebd8bc62e6658513d3b2a1119e91c3ea6810" ], "author": { "name": "Dean Nelson", "email": "dnelson@redhat.com", "time": "Mon Oct 31 17:09:04 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 31 17:30:49 2011 -0700" }, "message": "HWPOISON: convert pr_debug()s to pr_info()s\n\nCommit fb46e73520940b (\"HWPOISON: Convert pr_debugs to pr_info) authored\nby Andi Kleen converted a number of pr_debug()s to pr_info()s.\n\nAbout the same time additional code with pr_debug()s was added by two\nother commits 8c6c2ecb4466 (\"HWPOSION, hugetlb: recover from free hugepage\nerror when !MF_COUNT_INCREASED\") and d950b95882f3d (\"HWPOISON, hugetlb:\nsoft offlining for hugepage\"). And these pr_debug()s failed to get\nconverted to pr_info()s.\n\nThis patch converts them as well. And does some minor related whitespace\ncleanup.\n\nSigned-off-by: Dean Nelson \u003cdnelson@redhat.com\u003e\nReviewed-by: Andi Kleen \u003cak@linux.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": "584cff54e1ff8f59d5109dc8093efedff8bcc375", "tree": "464c9acb8bf22bf3a052fef23d3fd9f4f892da4a", "parents": [ "09f363c7363eb10cfb4b82094bd7064e5608258b" ], "author": { "name": "Kautuk Consul", "email": "consul.kautuk@gmail.com", "time": "Mon Oct 31 17:08:59 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 31 17:30:49 2011 -0700" }, "message": "mm/mmap.c: eliminate the ret variable from mm_take_all_locks()\n\nThe ret variable is really not needed in mm_take_all_locks().\n\nSigned-off-by: Kautuk Consul \u003cconsul.kautuk@gmail.com\u003e\nReviewed-by: Michal Hocko \u003cmhocko@suse.cz\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "20c8c62891a346e09c8d26de41ce78bd7a76c5b0", "tree": "6e0a81457ee2c142f96e6e3db66c479eac21fc4a", "parents": [ "99ef0315f1b320f392acc4364598340e78758fd2" ], "author": { "name": "Andrew Morton", "email": "akpm@linux-foundation.org", "time": "Mon Oct 31 17:08:54 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 31 17:30:49 2011 -0700" }, "message": "mm-add-comment-explaining-task-state-setting-in-bdi_forker_thread-fix\n\nfiddle wording\n\nCc: Jan Kara \u003cjack@suse.cz\u003e\nCc: Wu Fengguang \u003cfengguang.wu@intel.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "99ef0315f1b320f392acc4364598340e78758fd2", "tree": "e8aadca4fd1debdf9ea17c238d3bf2fc73a96137", "parents": [ "de7d2b567d040e3b67fe7121945982f14343213d" ], "author": { "name": "Wanlong Gao", "email": "gaowanlong@cn.fujitsu.com", "time": "Mon Oct 31 17:08:51 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 31 17:30:49 2011 -0700" }, "message": "ksm: fix the comment of try_to_unmap_one()\n\ntry_to_unmap_one() is called by try_to_unmap_ksm(), too.\n\nSigned-off-by: Wanlong Gao \u003cgaowanlong@cn.fujitsu.com\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": "de7d2b567d040e3b67fe7121945982f14343213d", "tree": "c834efc1b4117049b5da786417d9cc14c2b31076", "parents": [ "f0dfcde099453aa4c0dc42473828d15a6d492936" ], "author": { "name": "Joe Perches", "email": "joe@perches.com", "time": "Mon Oct 31 17:08:48 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 31 17:30:48 2011 -0700" }, "message": "mm/vmalloc.c: report more vmalloc failures\n\nSome vmalloc failure paths do not report OOM conditions.\n\nAdd warn_alloc_failed, which also does a dump_stack, to those failure\npaths.\n\nThis allows more site specific vmalloc failure logging message printks to\nbe removed.\n\nSigned-off-by: Joe Perches \u003cjoe@perches.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "f0dfcde099453aa4c0dc42473828d15a6d492936", "tree": "50346f4e8d9a773f266194661edea903a855a110", "parents": [ "d1f0ece6cdca973c01a46dff0eb062baafe78a85" ], "author": { "name": "Alex,Shi", "email": "alex.shi@intel.com", "time": "Mon Oct 31 17:08:45 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 31 17:30:48 2011 -0700" }, "message": "kswapd: assign new_order and new_classzone_idx after wakeup in sleeping\n\nThere 2 places to read pgdat in kswapd. One is return from a successful\nbalance, another is waked up from kswapd sleeping. The new_order and\nnew_classzone_idx represent the balance input order and classzone_idx.\n\nBut current new_order and new_classzone_idx are not assigned after\nkswapd_try_to_sleep(), that will cause a bug in the following scenario.\n\n1: after a successful balance, kswapd goes to sleep, and new_order \u003d 0;\n new_classzone_idx \u003d __MAX_NR_ZONES - 1;\n\n2: kswapd waked up with order \u003d 3 and classzone_idx \u003d ZONE_NORMAL\n\n3: in the balance_pgdat() running, a new balance wakeup happened with\n order \u003d 5, and classzone_idx \u003d ZONE_NORMAL\n\n4: the first wakeup(order \u003d 3) finished successufly, return order \u003d 3\n but, the new_order is still 0, so, this balancing will be treated as a\n failed balance. And then the second tighter balancing will be missed.\n\nSo, to avoid the above problem, the new_order and new_classzone_idx need\nto be assigned for later successful comparison.\n\nSigned-off-by: Alex Shi \u003calex.shi@intel.com\u003e\nAcked-by: Mel Gorman \u003cmgorman@suse.de\u003e\nReviewed-by: Minchan Kim \u003cminchan.kim@gmail.com\u003e\nTested-by: Pádraig Brady \u003cP@draigBrady.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "d1f0ece6cdca973c01a46dff0eb062baafe78a85", "tree": "570aabe98bb19454723c122cee74fa42cbfa49c9", "parents": [ "d2ebd0f6b89567eb93ead4e2ca0cbe03021f344b" ], "author": { "name": "Jonghwan Choi", "email": "jhbird.choi@samsung.com", "time": "Mon Oct 31 17:08:42 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 31 17:30:48 2011 -0700" }, "message": "mm/memblock.c: small function definition fixes\n\nwarning: function \u0027memblock_memory_can_coalesce\u0027\nwith external linkage has definition.\n\nSigned-off-by: Jonghwan Choi \u003cjhbird.choi@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": "d2ebd0f6b89567eb93ead4e2ca0cbe03021f344b", "tree": "1f8fc3f7702a8b4d362f5537e135e96f86043f8d", "parents": [ "64212ec569bfdd094f7a23d9b09862209a983559" ], "author": { "name": "Alex,Shi", "email": "alex.shi@intel.com", "time": "Mon Oct 31 17:08:39 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 31 17:30:48 2011 -0700" }, "message": "kswapd: avoid unnecessary rebalance after an unsuccessful balancing\n\nIn commit 215ddd66 (\"mm: vmscan: only read new_classzone_idx from pgdat\nwhen reclaiming successfully\") , Mel Gorman said kswapd is better to sleep\nafter a unsuccessful balancing if there is tighter reclaim request pending\nin the balancing. But in the following scenario, kswapd do something that\nis not matched our expectation. The patch fixes this issue.\n\n1, Read pgdat request A (classzone_idx, order \u003d 3)\n2, balance_pgdat()\n3, During pgdat, a new pgdat request B (classzone_idx, order \u003d 5) is placed\n4, balance_pgdat() returns but failed since returned order \u003d 0\n5, pgdat of request A assigned to balance_pgdat(), and do balancing again.\n While the expectation behavior of kswapd should try to sleep.\n\nSigned-off-by: Alex Shi \u003calex.shi@intel.com\u003e\nReviewed-by: Tim Chen \u003ctim.c.chen@linux.intel.com\u003e\nAcked-by: Mel Gorman \u003cmgorman@suse.de\u003e\nTested-by: Pádraig Brady \u003cP@draigBrady.com\u003e\nCc: Rik van Riel \u003criel@redhat.com\u003e\nCc: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "64212ec569bfdd094f7a23d9b09862209a983559", "tree": "af9a80c08795e602c5a6401fa3599562c2b6be48", "parents": [ "3ee9a4f086716d792219c021e8509f91165a4128" ], "author": { "name": "Akinobu Mita", "email": "akinobu.mita@gmail.com", "time": "Mon Oct 31 17:08:38 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 31 17:30:48 2011 -0700" }, "message": "debug-pagealloc: add support for highmem pages\n\nThis adds support for highmem pages poisoning and verification to the\ndebug-pagealloc feature for no-architecture support.\n\n[akpm@linux-foundation.org: remove unneeded preempt_disable/enable]\nSigned-off-by: Akinobu Mita \u003cakinobu.mita@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": "3ee9a4f086716d792219c021e8509f91165a4128", "tree": "f85162b8e024624f07909eaba4e85b89df924ebb", "parents": [ "06d5e032adcbc7d50c606a1396f00e2474e4213e" ], "author": { "name": "Joe Perches", "email": "joe@perches.com", "time": "Mon Oct 31 17:08:35 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 31 17:30:48 2011 -0700" }, "message": "mm: neaten warn_alloc_failed\n\nAdd __attribute__((format (printf...) to the function to validate format\nand arguments. Use vsprintf extension %pV to avoid any possible message\ninterleaving. Coalesce format string. Convert printks/pr_warning to\npr_warn.\n\n[akpm@linux-foundation.org: use the __printf() macro]\nSigned-off-by: Joe Perches \u003cjoe@perches.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "37a1c49a91ad55f917a399ef2174b5ebda4283f9", "tree": "d272ab0f51016181493c6792f0cf229a87da9ae3", "parents": [ "7b6efc2bc4f19952b25ebf9b236e5ac43cd386c2" ], "author": { "name": "Andrea Arcangeli", "email": "aarcange@redhat.com", "time": "Mon Oct 31 17:08:30 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 31 17:30:48 2011 -0700" }, "message": "thp: mremap support and TLB optimization\n\nThis adds THP support to mremap (decreases the number of split_huge_page()\ncalls).\n\nHere are also some benchmarks with a proggy like this:\n\n\u003d\u003d\u003d\n#define _GNU_SOURCE\n#include \u003csys/mman.h\u003e\n#include \u003cstdlib.h\u003e\n#include \u003cstdio.h\u003e\n#include \u003cstring.h\u003e\n#include \u003csys/time.h\u003e\n\n#define SIZE (5UL*1024*1024*1024)\n\nint main()\n{\n static struct timeval oldstamp, newstamp;\n\tlong diffsec;\n\tchar *p, *p2, *p3, *p4;\n\tif (posix_memalign((void **)\u0026p, 2*1024*1024, SIZE))\n\t\tperror(\"memalign\"), exit(1);\n\tif (posix_memalign((void **)\u0026p2, 2*1024*1024, SIZE))\n\t\tperror(\"memalign\"), exit(1);\n\tif (posix_memalign((void **)\u0026p3, 2*1024*1024, 4096))\n\t\tperror(\"memalign\"), exit(1);\n\n\tmemset(p, 0xff, SIZE);\n\tmemset(p2, 0xff, SIZE);\n\tmemset(p3, 0x77, 4096);\n\tgettimeofday(\u0026oldstamp, NULL);\n\tp4 \u003d mremap(p, SIZE, SIZE, MREMAP_FIXED|MREMAP_MAYMOVE, p3);\n\tgettimeofday(\u0026newstamp, NULL);\n\tdiffsec \u003d newstamp.tv_sec - oldstamp.tv_sec;\n\tdiffsec \u003d newstamp.tv_usec - oldstamp.tv_usec + 1000000 * diffsec;\n\tprintf(\"usec %ld\\n\", diffsec);\n\tif (p \u003d\u003d MAP_FAILED || p4 !\u003d p3)\n\t//if (p \u003d\u003d MAP_FAILED)\n\t\tperror(\"mremap\"), exit(1);\n\tif (memcmp(p4, p2, SIZE))\n\t\tprintf(\"mremap bug\\n\"), exit(1);\n\tprintf(\"ok\\n\");\n\n\treturn 0;\n}\n\u003d\u003d\u003d\n\nTHP on\n\n Performance counter stats for \u0027./largepage13\u0027 (3 runs):\n\n 69195836 dTLB-loads ( +- 3.546% ) (scaled from 50.30%)\n 60708 dTLB-load-misses ( +- 11.776% ) (scaled from 52.62%)\n 676266476 dTLB-stores ( +- 5.654% ) (scaled from 69.54%)\n 29856 dTLB-store-misses ( +- 4.081% ) (scaled from 89.22%)\n 1055848782 iTLB-loads ( +- 4.526% ) (scaled from 80.18%)\n 8689 iTLB-load-misses ( +- 2.987% ) (scaled from 58.20%)\n\n 7.314454164 seconds time elapsed ( +- 0.023% )\n\nTHP off\n\n Performance counter stats for \u0027./largepage13\u0027 (3 runs):\n\n 1967379311 dTLB-loads ( +- 0.506% ) (scaled from 60.59%)\n 9238687 dTLB-load-misses ( +- 22.547% ) (scaled from 61.87%)\n 2014239444 dTLB-stores ( +- 0.692% ) (scaled from 60.40%)\n 3312335 dTLB-store-misses ( +- 7.304% ) (scaled from 67.60%)\n 6764372065 iTLB-loads ( +- 0.925% ) (scaled from 79.00%)\n 8202 iTLB-load-misses ( +- 0.475% ) (scaled from 70.55%)\n\n 9.693655243 seconds time elapsed ( +- 0.069% )\n\ngrep thp /proc/vmstat\nthp_fault_alloc 35849\nthp_fault_fallback 0\nthp_collapse_alloc 3\nthp_collapse_alloc_failed 0\nthp_split 0\n\nthp_split 0 confirms no thp split despite plenty of hugepages allocated.\n\nThe measurement of only the mremap time (so excluding the 3 long\nmemset and final long 10GB memory accessing memcmp):\n\nTHP on\n\nusec 14824\nusec 14862\nusec 14859\n\nTHP off\n\nusec 256416\nusec 255981\nusec 255847\n\nWith an older kernel without the mremap optimizations (the below patch\noptimizes the non THP version too).\n\nTHP on\n\nusec 392107\nusec 390237\nusec 404124\n\nTHP off\n\nusec 444294\nusec 445237\nusec 445820\n\nI guess with a threaded program that sends more IPI on large SMP it\u0027d\ncreate an even larger difference.\n\nAll debug options are off except DEBUG_VM to avoid skewing the\nresults.\n\nThe only problem for native 2M mremap like it happens above both the\nsource and destination address must be 2M aligned or the hugepmd can\u0027t be\nmoved without a split but that is an hardware limitation.\n\n[akpm@linux-foundation.org: coding-style nitpicking]\nSigned-off-by: Andrea Arcangeli \u003caarcange@redhat.com\u003e\nAcked-by: Johannes Weiner \u003cjweiner@redhat.com\u003e\nAcked-by: Mel Gorman \u003cmgorman@suse.de\u003e\nAcked-by: Rik van Riel \u003criel@redhat.com\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": "7b6efc2bc4f19952b25ebf9b236e5ac43cd386c2", "tree": "bae674bd95329a498a5f2cc5d9c23bf5a4a54305", "parents": [ "ebed48460be5abd86d9a24fa7c66378e58109f30" ], "author": { "name": "Andrea Arcangeli", "email": "aarcange@redhat.com", "time": "Mon Oct 31 17:08:26 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 31 17:30:48 2011 -0700" }, "message": "mremap: avoid sending one IPI per page\n\nThis replaces ptep_clear_flush() with ptep_get_and_clear() and a single\nflush_tlb_range() at the end of the loop, to avoid sending one IPI for\neach page.\n\nThe mmu_notifier_invalidate_range_start/end section is enlarged\naccordingly but this is not going to fundamentally change things. It was\nmore by accident that the region under mremap was for the most part still\navailable for secondary MMUs: the primary MMU was never allowed to\nreliably access that region for the duration of the mremap (modulo\ntrapping SIGSEGV on the old address range which sounds unpractical and\nflakey). If users wants secondary MMUs not to lose access to a large\nregion under mremap they should reduce the mremap size accordingly in\nuserland and run multiple calls. Overall this will run faster so it\u0027s\nactually going to reduce the time the region is under mremap for the\nprimary MMU which should provide a net benefit to apps.\n\nFor KVM this is a noop because the guest physical memory is never\nmremapped, there\u0027s just no point it ever moving it while guest runs. One\ntarget of this optimization is JVM GC (so unrelated to the mmu notifier\nlogic).\n\nSigned-off-by: Andrea Arcangeli \u003caarcange@redhat.com\u003e\nAcked-by: Johannes Weiner \u003cjweiner@redhat.com\u003e\nAcked-by: Mel Gorman \u003cmgorman@suse.de\u003e\nAcked-by: Rik van Riel \u003criel@redhat.com\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": "ebed48460be5abd86d9a24fa7c66378e58109f30", "tree": "721d935953c58ac014e3d00ea1092ab480ea3356", "parents": [ "6661672053aee709d93f5dbd7887c789364c11d4" ], "author": { "name": "Andrea Arcangeli", "email": "aarcange@redhat.com", "time": "Mon Oct 31 17:08:22 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 31 17:30:47 2011 -0700" }, "message": "mremap: check for overflow using deltas\n\nUsing \"- 1\" relies on the old_end to be page aligned and PAGE_SIZE \u003e 1,\nthose are reasonable requirements but the check remains obscure and it\nlooks more like an off by one error than an overflow check. This I feel\nwill improve readability.\n\nSigned-off-by: Andrea Arcangeli \u003caarcange@redhat.com\u003e\nAcked-by: Johannes Weiner \u003cjweiner@redhat.com\u003e\nAcked-by: Mel Gorman \u003cmgorman@suse.de\u003e\nAcked-by: Rik van Riel \u003criel@redhat.com\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": "6661672053aee709d93f5dbd7887c789364c11d4", "tree": "9d11bdb001d4e08cb03f8fffb1e499a9204408d1", "parents": [ "0a93ebef698b08ed04af0d7d913bab8aedfdc253" ], "author": { "name": "Sam Ravnborg", "email": "sam@ravnborg.org", "time": "Mon Oct 31 17:08:20 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 31 17:30:47 2011 -0700" }, "message": "memblock: add NO_BOOTMEM config symbol\n\nWith the NO_BOOTMEM symbol added architectures may now use the following\nsyntax to tell that they do not need bootmem:\n\n\tselect NO_BOOTMEM\n\nThis is much more convinient than adding a new kconfig symbol which was\notherwise required.\n\nAdding this symbol does not conflict with the architctures that already\ndefine their own symbol.\n\nSigned-off-by: Sam Ravnborg \u003csam@ravnborg.org\u003e\nCc: Yinghai Lu \u003cyinghai@kernel.org\u003e\nAcked-by: Tejun Heo \u003ctj@kernel.org\u003e\nCc: \"H. Peter Anvin\" \u003chpa@zytor.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "0a93ebef698b08ed04af0d7d913bab8aedfdc253", "tree": "dcdb4bba9355647dd060d9150422537ad126442a", "parents": [ "f5252e009d5b87071a919221e4f6624184005368" ], "author": { "name": "Sam Ravnborg", "email": "sam@ravnborg.org", "time": "Mon Oct 31 17:08:16 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 31 17:30:47 2011 -0700" }, "message": "memblock: add memblock_start_of_DRAM()\n\nSPARC32 require access to the start address. Add a new helper\nmemblock_start_of_DRAM() to give access to the address of the first\nmemblock - which contains the lowest address.\n\nThe awkward name was chosen to match the already present\nmemblock_end_of_DRAM().\n\nSigned-off-by: Sam Ravnborg \u003csam@ravnborg.org\u003e\nCc: \"David S. Miller\" \u003cdavem@davemloft.net\u003e\nCc: Yinghai Lu \u003cyinghai@kernel.org\u003e\nAcked-by: Tejun Heo \u003ctj@kernel.org\u003e\nCc: \"H. Peter Anvin\" \u003chpa@zytor.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "f5252e009d5b87071a919221e4f6624184005368", "tree": "4be380e99c468dcb10597c445eb6b801897eafea", "parents": [ "8c5fb8eadde41f67c61a7ac2d3246dab87bf7020" ], "author": { "name": "Mitsuo Hayasaka", "email": "mitsuo.hayasaka.hu@hitachi.com", "time": "Mon Oct 31 17:08:13 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 31 17:30:47 2011 -0700" }, "message": "mm: avoid null pointer access in vm_struct via /proc/vmallocinfo\n\nThe /proc/vmallocinfo shows information about vmalloc allocations in\nvmlist that is a linklist of vm_struct. It, however, may access pages\nfield of vm_struct where a page was not allocated. This results in a null\npointer access and leads to a kernel panic.\n\nWhy this happens: In __vmalloc_node_range() called from vmalloc(), newly\nallocated vm_struct is added to vmlist at __get_vm_area_node() and then,\nsome fields of vm_struct such as nr_pages and pages are set at\n__vmalloc_area_node(). In other words, it is added to vmlist before it is\nfully initialized. At the same time, when the /proc/vmallocinfo is read,\nit accesses the pages field of vm_struct according to the nr_pages field\nat show_numa_info(). Thus, a null pointer access happens.\n\nThe patch adds the newly allocated vm_struct to the vmlist *after* it is\nfully initialized. So, it can avoid accessing the pages field with\nunallocated page when show_numa_info() is called.\n\nSigned-off-by: Mitsuo Hayasaka \u003cmitsuo.hayasaka.hu@hitachi.com\u003e\nCc: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nCc: David Rientjes \u003crientjes@google.com\u003e\nCc: Namhyung Kim \u003cnamhyung@gmail.com\u003e\nCc: \"Paul E. McKenney\" \u003cpaulmck@linux.vnet.ibm.com\u003e\nCc: Jeremy Fitzhardinge \u003cjeremy.fitzhardinge@citrix.com\u003e\nCc: \u003cstable@kernel.org\u003e\nCc: \u003cstable@vger.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": "8c5fb8eadde41f67c61a7ac2d3246dab87bf7020", "tree": "77d333e6e5f939c43ee57f16f499764e3ddb815a", "parents": [ "798248206b59acc6e1238c778281419c041891a7" ], "author": { "name": "Akinobu Mita", "email": "akinobu.mita@gmail.com", "time": "Mon Oct 31 17:08:10 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 31 17:30:47 2011 -0700" }, "message": "mm/debug-pagealloc.c: use memchr_inv\n\nUse newly introduced memchr_inv() for page verification.\n\nSigned-off-by: Akinobu Mita \u003cakinobu.mita@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": "798248206b59acc6e1238c778281419c041891a7", "tree": "ff8564431367b442b18bca4a0a9732e5799e2391", "parents": [ "77311139f364d7f71fc9ba88f59fd90e60205007" ], "author": { "name": "Akinobu Mita", "email": "akinobu.mita@gmail.com", "time": "Mon Oct 31 17:08:07 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 31 17:30:47 2011 -0700" }, "message": "lib/string.c: introduce memchr_inv()\n\nmemchr_inv() is mainly used to check whether the whole buffer is filled\nwith just a specified byte.\n\nThe function name and prototype are stolen from logfs and the\nimplementation is from SLUB.\n\nSigned-off-by: Akinobu Mita \u003cakinobu.mita@gmail.com\u003e\nAcked-by: Christoph Lameter \u003ccl@linux-foundation.org\u003e\nAcked-by: Pekka Enberg \u003cpenberg@kernel.org\u003e\nCc: Matt Mackall \u003cmpm@selenic.com\u003e\nAcked-by: Joern Engel \u003cjoern@logfs.org\u003e\nCc: Marcin Slusarz \u003cmarcin.slusarz@gmail.com\u003e\nCc: Eric Dumazet \u003ceric.dumazet@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": "77311139f364d7f71fc9ba88f59fd90e60205007", "tree": "5cde11d67e431781893bb0375dcae665750ed6dc", "parents": [ "16fb951237c2b0b28037b992ee44e7ee401c30d1" ], "author": { "name": "Akinobu Mita", "email": "akinobu.mita@gmail.com", "time": "Mon Oct 31 17:08:05 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 31 17:30:47 2011 -0700" }, "message": "mm/debug-pagealloc.c: use plain __ratelimit() instead of printk_ratelimit()\n\nprintk_ratelimit() should not be used, because it shares ratelimiting\nstate with all other unrelated printk_ratelimit() callsites.\n\nSigned-off-by: Akinobu Mita \u003cakinobu.mita@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": "16fb951237c2b0b28037b992ee44e7ee401c30d1", "tree": "756ba52239d304d8f45deb102f17960f0a8517ec", "parents": [ "49ea7eb65e7c5060807fb9312b1ad4c3eab82e2c" ], "author": { "name": "Shaohua Li", "email": "shaohua.li@intel.com", "time": "Mon Oct 31 17:08:02 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 31 17:30:47 2011 -0700" }, "message": "vmscan: count pages into balanced for zone with good watermark\n\nIt\u0027s possible a zone watermark is ok when entering the balance_pgdat()\nloop, while the zone is within the requested classzone_idx. Count pages\nfrom this zone into `balanced\u0027. In this way, we can skip shrinking zones\ntoo much for high order allocation.\n\nSigned-off-by: Shaohua Li \u003cshaohua.li@intel.com\u003e\nAcked-by: Mel Gorman \u003cmgorman@suse.de\u003e\nReviewed-by: 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": "49ea7eb65e7c5060807fb9312b1ad4c3eab82e2c", "tree": "88eaa206cdcac1190817820a0eb56bca2585f9ea", "parents": [ "92df3a723f84cdf8133560bbff950a7a99e92bc9" ], "author": { "name": "Mel Gorman", "email": "mgorman@suse.de", "time": "Mon Oct 31 17:07:59 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 31 17:30:47 2011 -0700" }, "message": "mm: vmscan: immediately reclaim end-of-LRU dirty pages when writeback completes\n\nWhen direct reclaim encounters a dirty page, it gets recycled around the\nLRU for another cycle. This patch marks the page PageReclaim similar to\ndeactivate_page() so that the page gets reclaimed almost immediately after\nthe page gets cleaned. This is to avoid reclaiming clean pages that are\nyounger than a dirty page encountered at the end of the LRU that might\nhave been something like a use-once page.\n\nSigned-off-by: Mel Gorman \u003cmgorman@suse.de\u003e\nAcked-by: Johannes Weiner \u003cjweiner@redhat.com\u003e\nCc: Dave Chinner \u003cdavid@fromorbit.com\u003e\nCc: Christoph Hellwig \u003chch@infradead.org\u003e\nCc: Wu Fengguang \u003cfengguang.wu@intel.com\u003e\nCc: Jan Kara \u003cjack@suse.cz\u003e\nCc: Minchan Kim \u003cminchan.kim@gmail.com\u003e\nCc: Rik van Riel \u003criel@redhat.com\u003e\nCc: Mel Gorman \u003cmgorman@suse.de\u003e\nCc: Alex Elder \u003caelder@sgi.com\u003e\nCc: Theodore Ts\u0027o \u003ctytso@mit.edu\u003e\nCc: Chris Mason \u003cchris.mason@oracle.com\u003e\nCc: Dave Hansen \u003cdave@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": "92df3a723f84cdf8133560bbff950a7a99e92bc9", "tree": "503efc278236d877508da66ea7ec7cbb81203d64", "parents": [ "f84f6e2b0868f198f97a32ba503d6f9f319a249a" ], "author": { "name": "Mel Gorman", "email": "mgorman@suse.de", "time": "Mon Oct 31 17:07:56 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 31 17:30:46 2011 -0700" }, "message": "mm: vmscan: throttle reclaim if encountering too many dirty pages under writeback\n\nWorkloads that are allocating frequently and writing files place a large\nnumber of dirty pages on the LRU. With use-once logic, it is possible for\nthem to reach the end of the LRU quickly requiring the reclaimer to scan\nmore to find clean pages. Ordinarily, processes that are dirtying memory\nwill get throttled by dirty balancing but this is a global heuristic and\ndoes not take into account that LRUs are maintained on a per-zone basis.\nThis can lead to a situation whereby reclaim is scanning heavily, skipping\nover a large number of pages under writeback and recycling them around the\nLRU consuming CPU.\n\nThis patch checks how many of the number of pages isolated from the LRU\nwere dirty and under writeback. If a percentage of them under writeback,\nthe process will be throttled if a backing device or the zone is\ncongested. Note that this applies whether it is anonymous or file-backed\npages that are under writeback meaning that swapping is potentially\nthrottled. This is intentional due to the fact if the swap device is\ncongested, scanning more pages and dispatching more IO is not going to\nhelp matters.\n\nThe percentage that must be in writeback depends on the priority. At\ndefault priority, all of them must be dirty. At DEF_PRIORITY-1, 50% of\nthem must be, DEF_PRIORITY-2, 25% etc. i.e. as pressure increases the\ngreater the likelihood the process will get throttled to allow the flusher\nthreads to make some progress.\n\nSigned-off-by: Mel Gorman \u003cmgorman@suse.de\u003e\nReviewed-by: Minchan Kim \u003cminchan.kim@gmail.com\u003e\nAcked-by: Johannes Weiner \u003cjweiner@redhat.com\u003e\nCc: Dave Chinner \u003cdavid@fromorbit.com\u003e\nCc: Christoph Hellwig \u003chch@infradead.org\u003e\nCc: Wu Fengguang \u003cfengguang.wu@intel.com\u003e\nCc: Jan Kara \u003cjack@suse.cz\u003e\nCc: Rik van Riel \u003criel@redhat.com\u003e\nCc: Mel Gorman \u003cmgorman@suse.de\u003e\nCc: Alex Elder \u003caelder@sgi.com\u003e\nCc: Theodore Ts\u0027o \u003ctytso@mit.edu\u003e\nCc: Chris Mason \u003cchris.mason@oracle.com\u003e\nCc: Dave Hansen \u003cdave@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": "f84f6e2b0868f198f97a32ba503d6f9f319a249a", "tree": "2103afe0304afd0045dca4b92dfd35922cfc289b", "parents": [ "966dbde2c208e07bab7a45a7855e1e693eabe661" ], "author": { "name": "Mel Gorman", "email": "mgorman@suse.de", "time": "Mon Oct 31 17:07:51 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 31 17:30:46 2011 -0700" }, "message": "mm: vmscan: do not writeback filesystem pages in kswapd except in high priority\n\nIt is preferable that no dirty pages are dispatched for cleaning from the\npage reclaim path. At normal priorities, this patch prevents kswapd\nwriting pages.\n\nHowever, page reclaim does have a requirement that pages be freed in a\nparticular zone. If it is failing to make sufficient progress (reclaiming\n\u003c SWAP_CLUSTER_MAX at any priority priority), the priority is raised to\nscan more pages. A priority of DEF_PRIORITY - 3 is considered to be the\npoint where kswapd is getting into trouble reclaiming pages. If this\npriority is reached, kswapd will dispatch pages for writing.\n\nSigned-off-by: Mel Gorman \u003cmgorman@suse.de\u003e\nReviewed-by: Minchan Kim \u003cminchan.kim@gmail.com\u003e\nCc: Dave Chinner \u003cdavid@fromorbit.com\u003e\nCc: Christoph Hellwig \u003chch@infradead.org\u003e\nCc: Johannes Weiner \u003cjweiner@redhat.com\u003e\nCc: Wu Fengguang \u003cfengguang.wu@intel.com\u003e\nCc: Jan Kara \u003cjack@suse.cz\u003e\nCc: Rik van Riel \u003criel@redhat.com\u003e\nCc: Mel Gorman \u003cmgorman@suse.de\u003e\nCc: Alex Elder \u003caelder@sgi.com\u003e\nCc: Theodore Ts\u0027o \u003ctytso@mit.edu\u003e\nCc: Chris Mason \u003cchris.mason@oracle.com\u003e\nCc: Dave Hansen \u003cdave@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": "a18bba061c789f5815c3efc3c80e6ac269911964", "tree": "bec0234fb338f8e06b6e39df2cfa09acf2a968a3", "parents": [ "ee72886d8ed5d9de3fa0ed3b99a7ca7702576a96" ], "author": { "name": "Mel Gorman", "email": "mgorman@suse.de", "time": "Mon Oct 31 17:07:42 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 31 17:30:46 2011 -0700" }, "message": "mm: vmscan: remove dead code related to lumpy reclaim waiting on pages under writeback\n\nLumpy reclaim worked with two passes - the first which queued pages for IO\nand the second which waited on writeback. As direct reclaim can no longer\nwrite pages there is some dead code. This patch removes it but direct\nreclaim will continue to wait on pages under writeback while in\nsynchronous reclaim mode.\n\nSigned-off-by: Mel Gorman \u003cmgorman@suse.de\u003e\nCc: Dave Chinner \u003cdavid@fromorbit.com\u003e\nCc: Christoph Hellwig \u003chch@infradead.org\u003e\nCc: Johannes Weiner \u003cjweiner@redhat.com\u003e\nCc: Wu Fengguang \u003cfengguang.wu@intel.com\u003e\nCc: Jan Kara \u003cjack@suse.cz\u003e\nCc: Minchan Kim \u003cminchan.kim@gmail.com\u003e\nCc: Rik van Riel \u003criel@redhat.com\u003e\nCc: Mel Gorman \u003cmgorman@suse.de\u003e\nCc: Alex Elder \u003caelder@sgi.com\u003e\nCc: Theodore Ts\u0027o \u003ctytso@mit.edu\u003e\nCc: Chris Mason \u003cchris.mason@oracle.com\u003e\nCc: Dave Hansen \u003cdave@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": "ee72886d8ed5d9de3fa0ed3b99a7ca7702576a96", "tree": "d9596005d3ea38541c5dfe1c2a0b7d5a4d73488f", "parents": [ "e10d59f2c3decaf22cc5d3de7040eba202bc2df3" ], "author": { "name": "Mel Gorman", "email": "mel@csn.ul.ie", "time": "Mon Oct 31 17:07:38 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 31 17:30:46 2011 -0700" }, "message": "mm: vmscan: do not writeback filesystem pages in direct reclaim\n\nTesting from the XFS folk revealed that there is still too much I/O from\nthe end of the LRU in kswapd. Previously it was considered acceptable by\nVM people for a small number of pages to be written back from reclaim with\ntesting generally showing about 0.3% of pages reclaimed were written back\n(higher if memory was low). That writing back a small number of pages is\nok has been heavily disputed for quite some time and Dave Chinner\nexplained it well;\n\n\tIt doesn\u0027t have to be a very high number to be a problem. IO\n\tis orders of magnitude slower than the CPU time it takes to\n\tflush a page, so the cost of making a bad flush decision is\n\tvery high. And single page writeback from the LRU is almost\n\talways a bad flush decision.\n\nTo complicate matters, filesystems respond very differently to requests\nfrom reclaim according to Christoph Hellwig;\n\n\txfs tries to write it back if the requester is kswapd\n\text4 ignores the request if it\u0027s a delayed allocation\n\tbtrfs ignores the request\n\nAs a result, each filesystem has different performance characteristics\nwhen under memory pressure and there are many pages being dirtied. In\nsome cases, the request is ignored entirely so the VM cannot depend on the\nIO being dispatched.\n\nThe objective of this series is to reduce writing of filesystem-backed\npages from reclaim, play nicely with writeback that is already in progress\nand throttle reclaim appropriately when writeback pages are encountered.\nThe assumption is that the flushers will always write pages faster than if\nreclaim issues the IO.\n\nA secondary goal is to avoid the problem whereby direct reclaim splices\ntwo potentially deep call stacks together.\n\nThere is a potential new problem as reclaim has less control over how long\nbefore a page in a particularly zone or container is cleaned and direct\nreclaimers depend on kswapd or flusher threads to do the necessary work.\nHowever, as filesystems sometimes ignore direct reclaim requests already,\nit is not expected to be a serious issue.\n\nPatch 1 disables writeback of filesystem pages from direct reclaim\n\tentirely. Anonymous pages are still written.\n\nPatch 2 removes dead code in lumpy reclaim as it is no longer able\n\tto synchronously write pages. This hurts lumpy reclaim but\n\tthere is an expectation that compaction is used for hugepage\n\tallocations these days and lumpy reclaim\u0027s days are numbered.\n\nPatches 3-4 add warnings to XFS and ext4 if called from\n\tdirect reclaim. With patch 1, this \"never happens\" and is\n\tintended to catch regressions in this logic in the future.\n\nPatch 5 disables writeback of filesystem pages from kswapd unless\n\tthe priority is raised to the point where kswapd is considered\n\tto be in trouble.\n\nPatch 6 throttles reclaimers if too many dirty pages are being\n\tencountered and the zones or backing devices are congested.\n\nPatch 7 invalidates dirty pages found at the end of the LRU so they\n\tare reclaimed quickly after being written back rather than\n\twaiting for a reclaimer to find them\n\nI consider this series to be orthogonal to the writeback work but it is\nworth noting that the writeback work affects the viability of patch 8 in\nparticular.\n\nI tested this on ext4 and xfs using fs_mark, a simple writeback test based\non dd and a micro benchmark that does a streaming write to a large mapping\n(exercises use-once LRU logic) followed by streaming writes to a mix of\nanonymous and file-backed mappings. The command line for fs_mark when\nbotted with 512M looked something like\n\n./fs_mark -d /tmp/fsmark-2676 -D 100 -N 150 -n 150 -L 25 -t 1 -S0 -s 10485760\n\nThe number of files was adjusted depending on the amount of available\nmemory so that the files created was about 3xRAM. For multiple threads,\nthe -d switch is specified multiple times.\n\nThe test machine is x86-64 with an older generation of AMD processor with\n4 cores. The underlying storage was 4 disks configured as RAID-0 as this\nwas the best configuration of storage I had available. Swap is on a\nseparate disk. Dirty ratio was tuned to 40% instead of the default of\n20%.\n\nTesting was run with and without monitors to both verify that the patches\nwere operating as expected and that any performance gain was real and not\ndue to interference from monitors.\n\nHere is a summary of results based on testing XFS.\n\n512M1P-xfs Files/s mean 32.69 ( 0.00%) 34.44 ( 5.08%)\n512M1P-xfs Elapsed Time fsmark 51.41 48.29\n512M1P-xfs Elapsed Time simple-wb 114.09 108.61\n512M1P-xfs Elapsed Time mmap-strm 113.46 109.34\n512M1P-xfs Kswapd efficiency fsmark 62% 63%\n512M1P-xfs Kswapd efficiency simple-wb 56% 61%\n512M1P-xfs Kswapd efficiency mmap-strm 44% 42%\n512M-xfs Files/s mean 30.78 ( 0.00%) 35.94 (14.36%)\n512M-xfs Elapsed Time fsmark 56.08 48.90\n512M-xfs Elapsed Time simple-wb 112.22 98.13\n512M-xfs Elapsed Time mmap-strm 219.15 196.67\n512M-xfs Kswapd efficiency fsmark 54% 56%\n512M-xfs Kswapd efficiency simple-wb 54% 55%\n512M-xfs Kswapd efficiency mmap-strm 45% 44%\n512M-4X-xfs Files/s mean 30.31 ( 0.00%) 33.33 ( 9.06%)\n512M-4X-xfs Elapsed Time fsmark 63.26 55.88\n512M-4X-xfs Elapsed Time simple-wb 100.90 90.25\n512M-4X-xfs Elapsed Time mmap-strm 261.73 255.38\n512M-4X-xfs Kswapd efficiency fsmark 49% 50%\n512M-4X-xfs Kswapd efficiency simple-wb 54% 56%\n512M-4X-xfs Kswapd efficiency mmap-strm 37% 36%\n512M-16X-xfs Files/s mean 60.89 ( 0.00%) 65.22 ( 6.64%)\n512M-16X-xfs Elapsed Time fsmark 67.47 58.25\n512M-16X-xfs Elapsed Time simple-wb 103.22 90.89\n512M-16X-xfs Elapsed Time mmap-strm 237.09 198.82\n512M-16X-xfs Kswapd efficiency fsmark 45% 46%\n512M-16X-xfs Kswapd efficiency simple-wb 53% 55%\n512M-16X-xfs Kswapd efficiency mmap-strm 33% 33%\n\nUp until 512-4X, the FSmark improvements were statistically significant.\nFor the 4X and 16X tests the results were within standard deviations but\njust barely. The time to completion for all tests is improved which is an\nimportant result. In general, kswapd efficiency is not affected by\nskipping dirty pages.\n\n1024M1P-xfs Files/s mean 39.09 ( 0.00%) 41.15 ( 5.01%)\n1024M1P-xfs Elapsed Time fsmark 84.14 80.41\n1024M1P-xfs Elapsed Time simple-wb 210.77 184.78\n1024M1P-xfs Elapsed Time mmap-strm 162.00 160.34\n1024M1P-xfs Kswapd efficiency fsmark 69% 75%\n1024M1P-xfs Kswapd efficiency simple-wb 71% 77%\n1024M1P-xfs Kswapd efficiency mmap-strm 43% 44%\n1024M-xfs Files/s mean 35.45 ( 0.00%) 37.00 ( 4.19%)\n1024M-xfs Elapsed Time fsmark 94.59 91.00\n1024M-xfs Elapsed Time simple-wb 229.84 195.08\n1024M-xfs Elapsed Time mmap-strm 405.38 440.29\n1024M-xfs Kswapd efficiency fsmark 79% 71%\n1024M-xfs Kswapd efficiency simple-wb 74% 74%\n1024M-xfs Kswapd efficiency mmap-strm 39% 42%\n1024M-4X-xfs Files/s mean 32.63 ( 0.00%) 35.05 ( 6.90%)\n1024M-4X-xfs Elapsed Time fsmark 103.33 97.74\n1024M-4X-xfs Elapsed Time simple-wb 204.48 178.57\n1024M-4X-xfs Elapsed Time mmap-strm 528.38 511.88\n1024M-4X-xfs Kswapd efficiency fsmark 81% 70%\n1024M-4X-xfs Kswapd efficiency simple-wb 73% 72%\n1024M-4X-xfs Kswapd efficiency mmap-strm 39% 38%\n1024M-16X-xfs Files/s mean 42.65 ( 0.00%) 42.97 ( 0.74%)\n1024M-16X-xfs Elapsed Time fsmark 103.11 99.11\n1024M-16X-xfs Elapsed Time simple-wb 200.83 178.24\n1024M-16X-xfs Elapsed Time mmap-strm 397.35 459.82\n1024M-16X-xfs Kswapd efficiency fsmark 84% 69%\n1024M-16X-xfs Kswapd efficiency simple-wb 74% 73%\n1024M-16X-xfs Kswapd efficiency mmap-strm 39% 40%\n\nAll FSMark tests up to 16X had statistically significant improvements.\nFor the most part, tests are completing faster with the exception of the\nstreaming writes to a mixture of anonymous and file-backed mappings which\nwere slower in two cases\n\nIn the cases where the mmap-strm tests were slower, there was more\nswapping due to dirty pages being skipped. The number of additional pages\nswapped is almost identical to the fewer number of pages written from\nreclaim. In other words, roughly the same number of pages were reclaimed\nbut swapping was slower. As the test is a bit unrealistic and stresses\nmemory heavily, the small shift is acceptable.\n\n4608M1P-xfs Files/s mean 29.75 ( 0.00%) 30.96 ( 3.91%)\n4608M1P-xfs Elapsed Time fsmark 512.01 492.15\n4608M1P-xfs Elapsed Time simple-wb 618.18 566.24\n4608M1P-xfs Elapsed Time mmap-strm 488.05 465.07\n4608M1P-xfs Kswapd efficiency fsmark 93% 86%\n4608M1P-xfs Kswapd efficiency simple-wb 88% 84%\n4608M1P-xfs Kswapd efficiency mmap-strm 46% 45%\n4608M-xfs Files/s mean 27.60 ( 0.00%) 28.85 ( 4.33%)\n4608M-xfs Elapsed Time fsmark 555.96 532.34\n4608M-xfs Elapsed Time simple-wb 659.72 571.85\n4608M-xfs Elapsed Time mmap-strm 1082.57 1146.38\n4608M-xfs Kswapd efficiency fsmark 89% 91%\n4608M-xfs Kswapd efficiency simple-wb 88% 82%\n4608M-xfs Kswapd efficiency mmap-strm 48% 46%\n4608M-4X-xfs Files/s mean 26.00 ( 0.00%) 27.47 ( 5.35%)\n4608M-4X-xfs Elapsed Time fsmark 592.91 564.00\n4608M-4X-xfs Elapsed Time simple-wb 616.65 575.07\n4608M-4X-xfs Elapsed Time mmap-strm 1773.02 1631.53\n4608M-4X-xfs Kswapd efficiency fsmark 90% 94%\n4608M-4X-xfs Kswapd efficiency simple-wb 87% 82%\n4608M-4X-xfs Kswapd efficiency mmap-strm 43% 43%\n4608M-16X-xfs Files/s mean 26.07 ( 0.00%) 26.42 ( 1.32%)\n4608M-16X-xfs Elapsed Time fsmark 602.69 585.78\n4608M-16X-xfs Elapsed Time simple-wb 606.60 573.81\n4608M-16X-xfs Elapsed Time mmap-strm 1549.75 1441.86\n4608M-16X-xfs Kswapd efficiency fsmark 98% 98%\n4608M-16X-xfs Kswapd efficiency simple-wb 88% 82%\n4608M-16X-xfs Kswapd efficiency mmap-strm 44% 42%\n\nUnlike the other tests, the fsmark results are not statistically\nsignificant but the min and max times are both improved and for the most\npart, tests completed faster.\n\nThere are other indications that this is an improvement as well. For\nexample, in the vast majority of cases, there were fewer pages scanned by\ndirect reclaim implying in many cases that stalls due to direct reclaim\nare reduced. KSwapd is scanning more due to skipping dirty pages which is\nunfortunate but the CPU usage is still acceptable\n\nIn an earlier set of tests, I used blktrace and in almost all cases\nthroughput throughout the entire test was higher. However, I ended up\ndiscarding those results as recording blktrace data was too heavy for my\nliking.\n\nOn a laptop, I plugged in a USB stick and ran a similar tests of tests\nusing it as backing storage. A desktop environment was running and for\nthe entire duration of the tests, firefox and gnome terminal were\nlaunching and exiting to vaguely simulate a user.\n\n1024M-xfs Files/s mean 0.41 ( 0.00%) 0.44 ( 6.82%)\n1024M-xfs Elapsed Time fsmark 2053.52 1641.03\n1024M-xfs Elapsed Time simple-wb 1229.53 768.05\n1024M-xfs Elapsed Time mmap-strm 4126.44 4597.03\n1024M-xfs Kswapd efficiency fsmark 84% 85%\n1024M-xfs Kswapd efficiency simple-wb 92% 81%\n1024M-xfs Kswapd efficiency mmap-strm 60% 51%\n1024M-xfs Avg wait ms fsmark 5404.53 4473.87\n1024M-xfs Avg wait ms simple-wb 2541.35 1453.54\n1024M-xfs Avg wait ms mmap-strm 3400.25 3852.53\n\nThe mmap-strm results were hurt because firefox launching had a tendency\nto push the test out of memory. On the postive side, firefox launched\nmarginally faster with the patches applied. Time to completion for many\ntests was faster but more importantly - the \"Avg wait\" time as measured by\niostat was far lower implying the system would be more responsive. It was\nalso the case that \"Avg wait ms\" on the root filesystem was lower. I\ntested it manually and while the system felt slightly more responsive\nwhile copying data to a USB stick, it was marginal enough that it could be\nmy imagination.\n\nThis patch: do not writeback filesystem pages in direct reclaim.\n\nWhen kswapd is failing to keep zones above the min watermark, a process\nwill enter direct reclaim in the same manner kswapd does. If a dirty page\nis encountered during the scan, this page is written to backing storage\nusing mapping-\u003ewritepage.\n\nThis causes two problems. First, it can result in very deep call stacks,\nparticularly if the target storage or filesystem are complex. Some\nfilesystems ignore write requests from direct reclaim as a result. The\nsecond is that a single-page flush is inefficient in terms of IO. While\nthere is an expectation that the elevator will merge requests, this does\nnot always happen. Quoting Christoph Hellwig;\n\n\tThe elevator has a relatively small window it can operate on,\n\tand can never fix up a bad large scale writeback pattern.\n\nThis patch prevents direct reclaim writing back filesystem pages by\nchecking if current is kswapd. Anonymous pages are still written to swap\nas there is not the equivalent of a flusher thread for anonymous pages.\nIf the dirty pages cannot be written back, they are placed back on the LRU\nlists. There is now a direct dependency on dirty page balancing to\nprevent too many pages in the system being dirtied which would prevent\nreclaim making forward progress.\n\nSigned-off-by: Mel Gorman \u003cmgorman@suse.de\u003e\nReviewed-by: Minchan Kim \u003cminchan.kim@gmail.com\u003e\nCc: Dave Chinner \u003cdavid@fromorbit.com\u003e\nCc: Christoph Hellwig \u003chch@infradead.org\u003e\nCc: Johannes Weiner \u003cjweiner@redhat.com\u003e\nCc: Wu Fengguang \u003cfengguang.wu@intel.com\u003e\nCc: Jan Kara \u003cjack@suse.cz\u003e\nCc: Rik van Riel \u003criel@redhat.com\u003e\nCc: Mel Gorman \u003cmgorman@suse.de\u003e\nCc: Alex Elder \u003caelder@sgi.com\u003e\nCc: Theodore Ts\u0027o \u003ctytso@mit.edu\u003e\nCc: Chris Mason \u003cchris.mason@oracle.com\u003e\nCc: Dave Hansen \u003cdave@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": "f11c0ca501af89fc07b0d9f17531ba3b68a4ef39", "tree": "c66a24b4ca2778b940c01a2af78eca6abc0b3421", "parents": [ "4f31888c104687078f8d88c2f11eca1080c88464" ], "author": { "name": "Johannes Weiner", "email": "jweiner@redhat.com", "time": "Mon Oct 31 17:07:27 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 31 17:30:46 2011 -0700" }, "message": "mm: vmscan: drop nr_force_scan[] from get_scan_count\n\nThe nr_force_scan[] tuple holds the effective scan numbers for anon and\nfile pages in case the situation called for a forced scan and the\nregularly calculated scan numbers turned out zero.\n\nHowever, the effective scan number can always be assumed to be\nSWAP_CLUSTER_MAX right before the division into anon and file. The\nnumerators and denominator are properly set up for all cases, be it force\nscan for just file, just anon, or both, to do the right thing.\n\nSigned-off-by: Johannes Weiner \u003cjweiner@redhat.com\u003e\nReviewed-by: Minchan Kim \u003cminchan.kim@gmail.com\u003e\nAcked-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nReviewed-by: Michal Hocko \u003cmhocko@suse.cz\u003e\nCc: Ying Han \u003cyinghan@google.com\u003e\nCc: Balbir Singh \u003cbsingharora@gmail.com\u003e\nCc: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nCc: Daisuke Nishimura \u003cnishimura@mxp.nes.nec.co.jp\u003e\nAcked-by: 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": "4f31888c104687078f8d88c2f11eca1080c88464", "tree": "453bcfffe1955f6087156916eb102af1575206ee", "parents": [ "f5fc870da2f8798edb5481cd2137a3b2d5bd1b19" ], "author": { "name": "Dave Jones", "email": "davej@redhat.com", "time": "Mon Oct 31 17:07:24 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 31 17:30:45 2011 -0700" }, "message": "mm: output a list of loaded modules when we hit bad_page()\n\nWhen we get a bad_page bug report, it\u0027s useful to see what modules the\nuser had loaded.\n\nSigned-off-by: Dave Jones \u003cdavej@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": "43362a4977e37db46f86f7e6ab935f0006956632", "tree": "5ab7070237ebd3f40d7fcfc0066586422da8310a", "parents": [ "c9f01245b6a7d77d17deaa71af10f6aca14fa24e" ], "author": { "name": "David Rientjes", "email": "rientjes@google.com", "time": "Mon Oct 31 17:07:18 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 31 17:30:45 2011 -0700" }, "message": "oom: fix race while temporarily setting current\u0027s oom_score_adj\n\ntest_set_oom_score_adj() was introduced in 72788c385604 (\"oom: replace\nPF_OOM_ORIGIN with toggling oom_score_adj\") to temporarily elevate\ncurrent\u0027s oom_score_adj for ksm and swapoff without requiring an\nadditional per-process flag.\n\nUsing that function to both set oom_score_adj to OOM_SCORE_ADJ_MAX and\nthen reinstate the previous value is racy since it\u0027s possible that\nuserspace can set the value to something else itself before the old value\nis reinstated. That results in userspace setting current\u0027s oom_score_adj\nto a different value and then the kernel immediately setting it back to\nits previous value without notification.\n\nTo fix this, a new compare_swap_oom_score_adj() function is introduced\nwith the same semantics as the compare and swap CAS instruction, or\nCMPXCHG on x86. It is used to reinstate the previous value of\noom_score_adj if and only if the present value is the same as the old\nvalue.\n\nSigned-off-by: David Rientjes \u003crientjes@google.com\u003e\nCc: Oleg Nesterov \u003coleg@redhat.com\u003e\nCc: Ying Han \u003cyinghan@google.com\u003e\nCc: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "c9f01245b6a7d77d17deaa71af10f6aca14fa24e", "tree": "13ffde591a5bcefba39cb6393f09b27f1ebc1a30", "parents": [ "7b0d44fa49b1dcfdcf4897f12ddd12ddeab1a9d7" ], "author": { "name": "David Rientjes", "email": "rientjes@google.com", "time": "Mon Oct 31 17:07:15 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 31 17:30:45 2011 -0700" }, "message": "oom: remove oom_disable_count\n\nThis removes mm-\u003eoom_disable_count entirely since it\u0027s unnecessary and\ncurrently buggy. The counter was intended to be per-process but it\u0027s\ncurrently decremented in the exit path for each thread that exits, causing\nit to underflow.\n\nThe count was originally intended to prevent oom killing threads that\nshare memory with threads that cannot be killed since it doesn\u0027t lead to\nfuture memory freeing. The counter could be fixed to represent all\nthreads sharing the same mm, but it\u0027s better to remove the count since:\n\n - it is possible that the OOM_DISABLE thread sharing memory with the\n victim is waiting on that thread to exit and will actually cause\n future memory freeing, and\n\n - there is no guarantee that a thread is disabled from oom killing just\n because another thread sharing its mm is oom disabled.\n\nSigned-off-by: David Rientjes \u003crientjes@google.com\u003e\nReported-by: Oleg Nesterov \u003coleg@redhat.com\u003e\nReviewed-by: Oleg Nesterov \u003coleg@redhat.com\u003e\nCc: Ying Han \u003cyinghan@google.com\u003e\nCc: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "7b0d44fa49b1dcfdcf4897f12ddd12ddeab1a9d7", "tree": "c840608f5266e4ba783f4c4405efe89b69ae5754", "parents": [ "f660daac474c6f7c2d710100e29b3276a6f4db0a" ], "author": { "name": "David Rientjes", "email": "rientjes@google.com", "time": "Mon Oct 31 17:07:11 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 31 17:30:45 2011 -0700" }, "message": "oom: avoid killing kthreads if they assume the oom killed thread\u0027s mm\n\nAfter selecting a task to kill, the oom killer iterates all processes and\nkills all other threads that share the same mm_struct in different thread\ngroups. It would not otherwise be helpful to kill a thread if its memory\nwould not be subsequently freed.\n\nA kernel thread, however, may assume a user thread\u0027s mm by using\nuse_mm(). This is only temporary and should not result in sending a\nSIGKILL to that kthread.\n\nThis patch ensures that only user threads and not kthreads are sent a\nSIGKILL if they share the same mm_struct as the oom killed task.\n\nSigned-off-by: David Rientjes \u003crientjes@google.com\u003e\nReviewed-by: Michal Hocko \u003cmhocko@suse.cz\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": "f660daac474c6f7c2d710100e29b3276a6f4db0a", "tree": "ad142e254a7b804cb158f2c64e9e6a77e8e4388c", "parents": [ "d08c429b06d21bd2add88aea2cd1996f1b9b3bda" ], "author": { "name": "David Rientjes", "email": "rientjes@google.com", "time": "Mon Oct 31 17:07:07 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 31 17:30:45 2011 -0700" }, "message": "oom: thaw threads if oom killed thread is frozen before deferring\n\nIf a thread has been oom killed and is frozen, thaw it before returning to\nthe page allocator. Otherwise, it can stay frozen indefinitely and no\nmemory will be freed.\n\nSigned-off-by: David Rientjes \u003crientjes@google.com\u003e\nReported-by: Konstantin Khlebnikov \u003ckhlebnikov@openvz.org\u003e\nCc: Oleg Nesterov \u003coleg@redhat.com\u003e\nCc: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nCc: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nCc: \"Rafael J. Wysocki\" \u003crjw@sisk.pl\u003e\nAcked-by: Michal Hocko \u003cmhocko@suse.cz\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "d08c429b06d21bd2add88aea2cd1996f1b9b3bda", "tree": "7a7f0002e4747ebc70978dcda565a09a943dc992", "parents": [ "3da367c3e5fca71d4e778fa565d9b098d5518f4a" ], "author": { "name": "Johannes Weiner", "email": "jweiner@redhat.com", "time": "Mon Oct 31 17:07:05 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 31 17:30:45 2011 -0700" }, "message": "mm/page-writeback.c: document bdi_min_ratio\n\nLooks like someone got distracted after adding the comment characters.\n\nSigned-off-by: Johannes Weiner \u003cjweiner@redhat.com\u003e\nAcked-by: Peter Zijlstra \u003cpeterz@infradead.org\u003e\nCc: Wu Fengguang \u003cfengguang.wu@intel.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" } ], "next": "3da367c3e5fca71d4e778fa565d9b098d5518f4a" }