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David Rientjes de077d222d oom, memcg: fix exclusion of memcg threads after they have detached their mm 
The oom killer relies on logic that identifies threads that have already
been oom killed when scanning the tasklist and, if found, deferring
until such threads have exited.  This is done by checking for any
candidate threads that have the TIF_MEMDIE bit set.

For memcg ooms, candidate threads are first found by calling
task_in_mem_cgroup() since the oom killer should not defer if there's an
oom killed thread in another memcg.

Unfortunately, task_in_mem_cgroup() excludes threads if they have
detached their mm in the process of exiting so TIF_MEMDIE is never
detected for such conditions.  This is different for global, mempolicy,
and cpuset oom conditions where a detached mm is only excluded after
checking for TIF_MEMDIE and deferring, if necessary, in
select_bad_process().

The fix is to return true if a task has a detached mm but is still in
the memcg or its hierarchy that is currently oom.  This will allow the
oom killer to appropriately defer rather than kill unnecessarily or, in
the worst case, panic the machine if nothing else is available to kill.

Signed-off-by: David Rientjes <rientjes@google.com>
Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Balbir Singh <bsingharora@gmail.com>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: Michal Hocko <mhocko@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2012-01-12 20:13:07 -08:00
..
Kconfig Merge branch 'master' into x86/memblock 2011-11-28 09:46:22 -08:00
Kconfig.debug mm: more intensive memory corruption debugging 2012-01-10 16:30:42 -08:00
Makefile Cross Memory Attach 2011-10-31 17:30:44 -07:00
backing-dev.c freezer: implement and use kthread_freezable_should_stop() 2011-11-21 12:32:23 -08:00
bootmem.c mm: bootmem: try harder to free pages in bulk 2012-01-10 16:30:45 -08:00
bounce.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
cleancache.c
…
compaction.c mm: compaction: push isolate search base of compact control one pfn ahead 2012-01-10 16:30:44 -08:00
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.c memcg: add mem_cgroup_replace_page_cache() to fix LRU issue 2012-01-12 20:13:04 -08:00
filemap_xip.c mm: Map most files to use export.h instead of module.h 2011-10-31 09:20:12 -04:00
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 memcg: make mem_cgroup_split_huge_fixup() more efficient 2012-01-12 20:13:05 -08:00
hugetlb.c mm/hugetlb.c: avoid bogus counter of surplus huge page 2012-01-10 16:30:45 -08:00
hwpoison-inject.c
…
init-mm.c atomic: use <linux/atomic.h> 2011-07-26 16:49:47 -07:00
internal.h mm: thp: tail page refcounting fix 2011-11-02 16:06:57 -07:00
kmemcheck.c
…
kmemleak-test.c
…
kmemleak.c mm: Map most files to use export.h instead of module.h 2011-10-31 09:20:12 -04:00
ksm.c oom: fix race while temporarily setting current's oom_score_adj 2011-10-31 17:30:45 -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 fs: kill i_alloc_sem 2011-07-20 20:47:46 -04:00
memblock.c memblock: Reimplement memblock allocation using reverse free area iterator 2011-12-08 10:22:09 -08:00
memcontrol.c oom, memcg: fix exclusion of memcg threads after they have detached their mm 2012-01-12 20:13:07 -08:00
memory-failure.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
memory.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
memory_hotplug.c mm: Map most files to use export.h instead of module.h 2011-10-31 09:20:12 -04:00
mempolicy.c mm/mempolicy.c: mpol_equal(): use bool 2012-01-10 16:30:45 -08:00
mempool.c mempool: fix first round failure behavior 2012-01-10 16:30:45 -08:00
migrate.c mm/migrate.c: remove the unused macro lru_to_page 2012-01-10 16:30:46 -08:00
mincore.c mm: clarify the radix_tree exceptional cases 2011-08-03 14:25:24 -10:00
mlock.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
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: simplify find_vma_prev() 2012-01-10 16:30:44 -08:00
mmu_context.c mm: Map most files to use export.h instead of module.h 2011-10-31 09:20:12 -04:00
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
…
mremap.c mremap: enforce rmap src/dst vma ordering in case of vma_merge() succeeding in copy_vma() 2012-01-10 16:30:44 -08:00
msync.c
…
nobootmem.c Merge branch 'master' into x86/memblock 2011-11-28 09:46:22 -08:00
nommu.c xen: map foreign pages for shared rings by updating the PTEs directly 2011-11-16 12:13:08 -05:00
oom_kill.c mm: unify remaining mem_cont, mem, etc. variable names to memcg 2012-01-12 20:13:06 -08:00
page-writeback.c Merge branch 'writeback-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/wfg/linux 2012-01-10 16:59:59 -08:00
page_alloc.c mm: collect LRU list heads into struct lruvec 2012-01-12 20:13:05 -08:00
page_cgroup.c page_cgroup: add helper function to get swap_cgroup 2012-01-12 20:13:07 -08:00
page_io.c
…
page_isolation.c
…
pagewalk.c pagewalk: fix code comment for THP 2011-07-25 20:57:09 -07:00
percpu-km.c
…
percpu-vm.c percpu: fix chunk range calculation 2011-11-22 08:09:46 -08:00
percpu.c percpu: fix per_cpu_ptr_to_phys() handling of non-page-aligned addresses 2011-12-15 11:41:40 -08:00
pgtable-generic.c
…
prio_tree.c
…
process_vm_access.c Cross Memory Attach 2011-10-31 17:30:44 -07:00
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: unify remaining mem_cont, mem, etc. variable names to memcg 2012-01-12 20:13:06 -08:00
shmem.c vfs: switch ->show_options() to struct dentry * 2012-01-06 23:19:54 -05:00
slab.c Merge branch 'slab/for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/linux 2012-01-11 18:52:23 -08:00
slob.c mm: Map most files to use export.h instead of module.h 2011-10-31 09:20:12 -04:00
slub.c mm,x86,um: move CMPXCHG_DOUBLE config option 2012-01-12 20:13:03 -08:00
sparse-vmemmap.c mm: delete various needless include <linux/module.h> 2011-10-31 09:20:11 -04:00
sparse.c mm: Map most files to use export.h instead of module.h 2011-10-31 09:20:12 -04:00
swap.c mm: make per-memcg LRU lists exclusive 2012-01-12 20:13:05 -08:00
swap_state.c fs: move code out of buffer.c 2012-01-03 22:54:07 -05:00
swapfile.c mm: unify remaining mem_cont, mem, etc. variable names to memcg 2012-01-12 20:13:06 -08:00
thrash.c mm/thrash.c: quiet sparse noise 2011-10-31 17:30:50 -07:00
truncate.c mm: Map most files to use export.h instead of module.h 2011-10-31 09:20:12 -04:00
util.c mm: Map most files to use export.h instead of module.h 2011-10-31 09:20:12 -04:00
vmalloc.c mm/vmalloc.c: change void* into explict vm_struct* 2012-01-10 16:30:46 -08:00
vmscan.c mm: unify remaining mem_cont, mem, etc. variable names to memcg 2012-01-12 20:13:06 -08:00
vmstat.c mm,x86,um: move CMPXCHG_LOCAL config option 2012-01-12 20:13:03 -08:00