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David Rientjes 1f1d06c34f thp, memcg: split hugepage for memcg oom on cow 
On COW, a new hugepage is allocated and charged to the memcg.  If the
system is oom or the charge to the memcg fails, however, the fault
handler will return VM_FAULT_OOM which results in an oom kill.

Instead, it's possible to fallback to splitting the hugepage so that the
COW results only in an order-0 page being allocated and charged to the
memcg which has a higher liklihood to succeed.  This is expensive
because the hugepage must be split in the page fault handler, but it is
much better than unnecessarily oom killing a process.

Signed-off-by: David Rientjes <rientjes@google.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Johannes Weiner <jweiner@redhat.com>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Michal Hocko <mhocko@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-05-29 16:22:19 -07:00
..
backing-dev.c
backing-dev: fix wakeup timer races with bdi_unregister()
2012-02-01 16:52:49 +08:00
bootmem.c
bootmem/sparsemem: remove limit constraint in alloc_bootmem_section
2012-03-21 17:54:58 -07:00
bounce.c
mm: remove the second argument of k[un]map_atomic()
2012-03-20 21:48:27 +08:00
cleancache.c
mm: cleancache: Use __read_mostly as appropiate.
2012-01-23 16:08:09 -05:00
compaction.c
mm: mmzone: MIGRATE_CMA migration type added
2012-05-21 15:09:32 +02:00
debug-pagealloc.c
mm, x86: Remove debug_pagealloc_enabled
2011-12-06 09:24:07 +01:00
dmapool.c
mm: fix implicit stat.h usage in dmapool.c
2011-10-31 09:20:12 -04:00
fadvise.c
fadvise: only initiate writeback for specified range with FADV_DONTNEED
2012-01-10 16:30:43 -08:00
failslab.c
switch debugfs to umode_t
2012-01-03 22:54:56 -05:00
filemap_xip.c
mm/filemap_xip.c: fix race condition in xip_file_fault()
2012-02-03 16:16:41 -08:00
filemap.c
radix-tree: use iterators in find_get_pages* functions
2012-03-28 17:14:37 -07:00
fremap.c
mm: delete various needless include <linux/module.h>
2011-10-31 09:20:11 -04:00
highmem.c
Merge branch 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux
2011-11-06 19:44:47 -08:00
huge_memory.c
thp, memcg: split hugepage for memcg oom on cow
2012-05-29 16:22:19 -07:00
hugetlb.c
mm/hugetlb.c: use long vars instead of int in region_count()
2012-05-29 16:22:18 -07:00
hwpoison-inject.c
HWPOISON: Clean up memory_failure() vs. __memory_failure()
2012-01-03 12:06:32 -08:00
init-mm.c
atomic: use <linux/atomic.h>
2011-07-26 16:49:47 -07:00
internal.h
mm: compaction: export some of the functions
2012-05-21 15:09:30 +02:00
Kconfig
mm: mmzone: MIGRATE_CMA migration type added
2012-05-21 15:09:32 +02:00
Kconfig.debug
mm: more intensive memory corruption debugging
2012-01-10 16:30:42 -08:00
kmemcheck.c
kmemcheck: Fix build errors due to missing slab.h
2010-03-30 22:02:32 +09:00
kmemleak-test.c
kmemleak: remove memset by using kzalloc
2011-01-27 18:31:51 +00:00
kmemleak.c
kmemleak: Disable early logging when kmemleak is off by default
2012-01-20 16:57:05 +00:00
ksm.c
ksm: cleanup: introduce find_mergeable_vma()
2012-03-21 17:54:59 -07:00
maccess.c
mm: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
madvise.c
coredump: add VM_NODUMP, MADV_NODUMP, MADV_CLEAR_NODUMP
2012-03-23 16:58:42 -07:00
Makefile
mm: remove swap token code
2012-05-29 16:22:19 -07:00
memblock.c
memblock: memblock should be able to handle zero length operations
2012-04-20 11:18:46 -07:00
memcontrol.c
mm: remove swap token code
2012-05-29 16:22:19 -07:00
memory_hotplug.c
mm: page_isolation: MIGRATE_CMA isolation functions added
2012-05-21 15:09:33 +02:00
memory-failure.c
mm/memory_failure: let the compiler add the function name
2012-05-29 16:22:18 -07:00
memory.c
thp, memcg: split hugepage for memcg oom on cow
2012-05-29 16:22:19 -07:00
mempolicy.c
mm/mempolicy.c: use enum value MPOL_REBIND_ONCE in mpol_rebind_policy()
2012-05-29 16:22:18 -07:00
mempool.c
mempool: fix first round failure behavior
2012-01-10 16:30:45 -08:00
migrate.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2012-05-23 17:42:39 -07:00
mincore.c
mm: thp: fix pmd_bad() triggering in code paths holding mmap_sem read mode
2012-03-21 17:54:54 -07:00
mlock.c
vm: avoid using find_vma_prev() unnecessarily
2012-03-06 18:23:36 -08:00
mm_init.c
mm: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
mmap.c
mm/mmap.c: find_vma(): remove unnecessary if(mm) check
2012-05-29 16:22:19 -07:00
mmu_context.c
mm, counters: remove task argument to sync_mm_rss() and __sync_task_rss_stat()
2012-03-21 17:54:59 -07:00
mmu_notifier.c
mm: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
mmzone.c
mm: delete various needless include <linux/module.h>
2011-10-31 09:20:11 -04:00
mprotect.c
Merge branch 'akpm' (Andrew's patch-bomb)
2012-03-22 09:04:48 -07:00
mremap.c
mm: collapse security_vm_enough_memory() variants into a single function
2012-02-14 10:45:39 +11:00
msync.c
sanitize vfs_fsync calling conventions
2010-05-21 18:31:21 -04:00
nobootmem.c
mm: nobootmem: fix sign extend problem in __free_pages_memory()
2012-05-10 15:06:44 -07:00
nommu.c
kill mm argument of vm_munmap()
2012-04-21 01:58:20 -04:00
oom_kill.c
userns: Store uid and gid values in struct cred with kuid_t and kgid_t types
2012-05-03 03:28:38 -07:00
page_alloc.c
Merge branch 'for-linus' of git://git.linaro.org/people/mszyprowski/linux-dma-mapping
2012-05-25 09:18:59 -07:00
page_cgroup.c
page_cgroup: fix horrid swap accounting regression
2012-03-06 08:18:23 -08:00
page_io.c
block: kill off REQ_UNPLUG
2011-03-10 08:52:27 +01:00
page_isolation.c
mm: page_isolation: MIGRATE_CMA isolation functions added
2012-05-21 15:09:33 +02:00
page-writeback.c
writeback: initialize global_dirty_limit
2012-05-06 13:41:58 +08:00
pagewalk.c
mm: thp: fix pmd_bad() triggering in code paths holding mmap_sem read mode
2012-03-21 17:54:54 -07:00
percpu-km.c
percpu: clear memory allocated with the km allocator
2010-10-02 10:28:42 +03:00
percpu-vm.c
percpu: use bitmap_clear
2012-01-20 09:23:16 -08:00
percpu.c
kmemleak: Fix the kmemleak tracking of the percpu areas with !SMP
2012-05-09 10:13:29 -07:00
pgtable-generic.c
arch/tile: allow building Linux with transparent huge pages enabled
2012-05-25 12:48:21 -04:00
prio_tree.c
sanitize <linux/prefetch.h> usage
2011-05-20 12:50:29 -07:00
process_vm_access.c
Fix race in process_vm_rw_core
2012-02-02 12:55:17 -08:00
quicklist.c
mm: delete various needless include <linux/module.h>
2011-10-31 09:20:11 -04:00
readahead.c
mm: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
rmap.c
mm: remove swap token code
2012-05-29 16:22:19 -07:00
shmem.c
avoid iput() from flusher thread
2012-05-28 09:54:45 -07:00
slab.c
Merge branch 'slab/for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/linux
2012-03-28 15:04:26 -07:00
slob.c
mm: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
slub.c
slub: missing test for partial pages flush work in flush_all()
2012-05-17 18:00:51 -07:00
sparse-vmemmap.c
mm: delete various needless include <linux/module.h>
2011-10-31 09:20:11 -04:00
sparse.c
bootmem/sparsemem: remove limit constraint in alloc_bootmem_section
2012-03-21 17:54:58 -07:00
swap_state.c
mm: fix s390 BUG by __set_page_dirty_no_writeback on swap
2012-04-23 18:19:22 -07:00
swap.c
mm: drain percpu lru add/rotate page-vectors on cpu hot-unplug
2012-03-21 17:54:58 -07:00
swapfile.c
swapon: check validity of swap_flags
2012-03-28 17:14:35 -07:00
truncate.c
mm for fs: add truncate_pagecache_range()
2012-03-28 17:14:35 -07:00
util.c
procfs: mark thread stack correctly in proc/<pid>/maps
2012-03-21 17:54:58 -07:00
vmalloc.c
mm: use kcalloc() instead of kzalloc() to allocate array
2012-05-29 16:22:19 -07:00
vmscan.c
mm: vmscan: remove reclaim_mode_t
2012-05-29 16:22:19 -07:00
vmstat.c
mm/vmstat.c: remove debug fs entries on failure of file creation and made extfrag_debug_root dentry local
2012-05-29 16:22:19 -07:00