Michal Hocko 03049269de mm, oom_reaper: implement OOM victims queuing ... wake_oom_reaper has allowed only 1 oom victim to be queued. The main reason for that was the simplicity as other solutions would require some way of queuing. The current approach is racy and that was deemed sufficient as the oom_reaper is considered a best effort approach to help with oom handling when the OOM victim cannot terminate in a reasonable time. The race could lead to missing an oom victim which can get stuck out_of_memory wake_oom_reaper cmpxchg // OK oom_reaper oom_reap_task __oom_reap_task oom_victim terminates atomic_inc_not_zero // fail out_of_memory wake_oom_reaper cmpxchg // fails task_to_reap = NULL This race requires 2 OOM invocations in a short time period which is not very likely but certainly not impossible. E.g. the original victim might have not released a lot of memory for some reason. The situation would improve considerably if wake_oom_reaper used a more robust queuing. This is what this patch implements. This means adding oom_reaper_list list_head into task_struct (eat a hole before embeded thread_struct for that purpose) and a oom_reaper_lock spinlock for queuing synchronization. wake_oom_reaper will then add the task on the queue and oom_reaper will dequeue it. Signed-off-by: Michal Hocko <mhocko@suse.com> Cc: Vladimir Davydov <vdavydov@virtuozzo.com> Cc: Andrea Argangeli <andrea@kernel.org> Cc: David Rientjes <rientjes@google.com> Cc: Hugh Dickins <hughd@google.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Mel Gorman <mgorman@suse.de> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Rik van Riel <riel@redhat.com> Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2016-03-25 16:37:42 -07:00
..
kasan	kernel: add kcov code coverage	2016-03-22 15:36:02 -07:00
backing-dev.c	mm: convert printk(KERN_<LEVEL> to pr_<level>	2016-03-17 15:09:34 -07:00
balloon_compaction.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2016-03-17 21:38:27 -07:00
bootmem.c	mm: convert printk(KERN_<LEVEL> to pr_<level>	2016-03-17 15:09:34 -07:00
cleancache.c	cleancache: constify cleancache_ops structure	2016-01-27 09:09:57 -05:00
cma_debug.c	mm/cma_debug: correct size input to bitmap function	2015-07-17 16:39:54 -07:00
cma.c	mm/cma.c: suppress warning	2015-11-05 19:34:48 -08:00
cma.h	mm: cma: mark cma_bitmap_maxno() inline in header	2015-08-14 15:56:32 -07:00
compaction.c	mm, kswapd: replace kswapd compaction with waking up kcompactd	2016-03-17 15:09:34 -07:00
debug_page_ref.c	mm/page_ref: add tracepoint to track down page reference manipulation	2016-03-17 15:09:34 -07:00
debug.c	mm: introduce page reference manipulation functions	2016-03-17 15:09:34 -07:00
dmapool.c	mm: convert printk(KERN_<LEVEL> to pr_<level>	2016-03-17 15:09:34 -07:00
early_ioremap.c	mm/early_ioremap: use offset_in_page macro	2015-11-05 19:34:48 -08:00
fadvise.c	writeback: implement and use inode_congested()	2015-06-02 08:33:35 -06:00
failslab.c	mm: fault-inject take over bootstrap kmem_cache check	2016-03-15 16:55:16 -07:00
filemap.c	mm: use radix_tree_iter_retry()	2016-03-17 15:09:34 -07:00
frame_vector.c	mm/gup: Switch all callers of get_user_pages() to not pass tsk/mm	2016-02-16 10:11:12 +01:00
frontswap.c	frontswap: allow multiple backends	2015-06-24 17:49:45 -07:00
gup.c	mm/core, x86/mm/pkeys: Differentiate instruction fetches	2016-02-18 19:46:29 +01:00
highmem.c
huge_memory.c	powerpc updates for 4.6	2016-03-19 15:38:41 -07:00
hugetlb_cgroup.c	mm: make compound_head() robust	2015-11-06 17:50:42 -08:00
hugetlb.c	mm: convert pr_warning to pr_warn	2016-03-17 15:09:34 -07:00
hwpoison-inject.c	hwpoison: use page_cgroup_ino for filtering by memcg	2015-09-10 13:29:01 -07:00
init-mm.c
internal.h	mm, oom: introduce oom reaper	2016-03-25 16:37:42 -07:00
interval_tree.c	mm: replace vma->sharead.linear with vma->shared	2015-02-10 14:30:31 -08:00
Kconfig	Merge branch 'mm-pkeys-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2016-03-20 19:08:56 -07:00
Kconfig.debug	mm/page_ref: add tracepoint to track down page reference manipulation	2016-03-17 15:09:34 -07:00
kmemcheck.c	mm: convert printk(KERN_<LEVEL> to pr_<level>	2016-03-17 15:09:34 -07:00
kmemleak-test.c	mm: convert printk(KERN_<LEVEL> to pr_<level>	2016-03-17 15:09:34 -07:00
kmemleak.c	mm: coalesce split strings	2016-03-17 15:09:34 -07:00
ksm.c	mm/core: Do not enforce PKEY permissions on remote mm access	2016-02-18 19:46:28 +01:00
list_lru.c	mm: memcontrol: move kmem accounting code to CONFIG_MEMCG	2016-01-20 17:09:18 -08:00
maccess.c	mm/maccess.c: actually return -EFAULT from strncpy_from_unsafe	2015-11-05 19:34:48 -08:00
madvise.c	mm/madvise: update comment on sys_madvise()	2016-03-15 16:55:16 -07:00
Makefile	kernel: add kcov code coverage	2016-03-22 15:36:02 -07:00
memblock.c	mm: coalesce split strings	2016-03-17 15:09:34 -07:00
memcontrol.c	mm: memcontrol: zap oom_info_lock	2016-03-17 15:09:34 -07:00
memory_hotplug.c	mm: coalesce split strings	2016-03-17 15:09:34 -07:00
memory-failure.c	mm: convert printk(KERN_<LEVEL> to pr_<level>	2016-03-17 15:09:34 -07:00
memory.c	mm, oom: introduce oom reaper	2016-03-25 16:37:42 -07:00
mempolicy.c	Merge branch 'mm-pkeys-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2016-03-20 19:08:56 -07:00
mempool.c	mm, mempool: only set __GFP_NOMEMALLOC if there are free elements	2016-03-17 15:09:34 -07:00
memtest.c	memtest: remove unused header files	2015-09-08 15:35:28 -07:00
migrate.c	mm: make remove_migration_ptes() beyond mm/migration.c	2016-03-17 15:09:34 -07:00
mincore.c	thp: change pmd_trans_huge_lock() interface to return ptl	2016-01-21 17:20:51 -08:00
mlock.c	mm: fix mlock accouting	2016-01-21 17:20:51 -08:00
mm_init.c	mm: convert printk(KERN_<LEVEL> to pr_<level>	2016-03-17 15:09:34 -07:00
mmap.c	Merge branch 'mm-pkeys-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2016-03-20 19:08:56 -07:00
mmu_context.c
mmu_notifier.c	fix Christoph's email addresses	2016-03-17 15:09:34 -07:00
mmzone.c	mm/mmzone.c: memmap_valid_within() can be boolean	2016-01-14 16:00:49 -08:00
mprotect.c	mm/mprotect.c: don't imply PROT_EXEC on non-exec fs	2016-03-22 15:36:02 -07:00
mremap.c	mm: cleanup *pte_alloc* interfaces	2016-03-17 15:09:34 -07:00
msync.c	mm/msync: use offset_in_page macro	2015-11-05 19:34:48 -08:00
nobootmem.c	mm: convert printk(KERN_<LEVEL> to pr_<level>	2016-03-17 15:09:34 -07:00
nommu.c	Merge branch 'mm-pkeys-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2016-03-20 19:08:56 -07:00
oom_kill.c	mm, oom_reaper: implement OOM victims queuing	2016-03-25 16:37:42 -07:00
page_alloc.c	mm,oom: do not loop !__GFP_FS allocation if the OOM killer is disabled	2016-03-17 15:09:34 -07:00
page_counter.c	mm: page_counter: let page_counter_try_charge() return bool	2015-11-05 19:34:48 -08:00
page_ext.c	mm/page_poisoning.c: allow for zero poisoning	2016-03-15 16:55:16 -07:00
page_idle.c	mm: add page_check_address_transhuge() helper	2016-01-15 17:56:32 -08:00
page_io.c	zram: revive swap_slot_free_notify	2016-03-22 15:36:02 -07:00
page_isolation.c	mm/page_isolation: do some cleanup in "undo_isolate_page_range"	2016-01-15 17:56:32 -08:00
page_owner.c	mm: coalesce split strings	2016-03-17 15:09:34 -07:00
page_poison.c	mm/page_poisoning.c: allow for zero poisoning	2016-03-15 16:55:16 -07:00
page-writeback.c	mm: remove unnecessary uses of lock_page_memcg()	2016-03-15 16:55:16 -07:00
pagewalk.c	thp: rename split_huge_page_pmd() to split_huge_pmd()	2016-01-15 17:56:32 -08:00
percpu-km.c	mm: percpu: use pr_fmt to prefix output	2016-03-17 15:09:34 -07:00
percpu-vm.c
percpu.c	mm: percpu: use pr_fmt to prefix output	2016-03-17 15:09:34 -07:00
pgtable-generic.c	mm/thp/migration: switch from flush_tlb_range to flush_pmd_tlb_range	2016-03-17 15:09:34 -07:00
process_vm_access.c	mm/gup: Introduce get_user_pages_remote()	2016-02-16 10:04:09 +01:00
quicklist.c	fix Christoph's email addresses	2016-03-17 15:09:34 -07:00
readahead.c	mm: move lru_to_page to mm_inline.h	2016-01-14 16:00:49 -08:00
rmap.c	thp: rewrite freeze_page()/unfreeze_page() with generic rmap walkers	2016-03-17 15:09:34 -07:00
shmem.c	radix-tree,shmem: introduce radix_tree_iter_next()	2016-03-17 15:09:34 -07:00
slab_common.c	mm: convert printk(KERN_<LEVEL> to pr_<level>	2016-03-17 15:09:34 -07:00
slab.c	mm: convert printk(KERN_<LEVEL> to pr_<level>	2016-03-17 15:09:34 -07:00
slab.h	mm: memcontrol: report slab usage in cgroup2 memory.stat	2016-03-17 15:09:34 -07:00
slob.c	mm: slab: free kmem_cache_node after destroy sysfs file	2016-02-18 16:23:24 -08:00
slub.c	mm: coalesce split strings	2016-03-17 15:09:34 -07:00
sparse-vmemmap.c	mm: convert printk(KERN_<LEVEL> to pr_<level>	2016-03-17 15:09:34 -07:00
sparse.c	mm: convert printk(KERN_<LEVEL> to pr_<level>	2016-03-17 15:09:34 -07:00
swap_cgroup.c	mm: convert printk(KERN_<LEVEL> to pr_<level>	2016-03-17 15:09:34 -07:00
swap_state.c	mm: memcontrol: charge swap to cgroup2	2016-01-20 17:09:18 -08:00
swap.c	mm, x86: get_user_pages() for dax mappings	2016-01-15 17:56:32 -08:00
swapfile.c	Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux	2016-03-21 13:48:00 -07:00
truncate.c	mm: remove unnecessary uses of lock_page_memcg()	2016-03-15 16:55:16 -07:00
userfaultfd.c	mm: cleanup *pte_alloc* interfaces	2016-03-17 15:09:34 -07:00
util.c	Merge branch 'mm-pkeys-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2016-03-20 19:08:56 -07:00
vmacache.c	mm/vmacache: inline vmacache_valid_mm()	2015-11-05 19:34:48 -08:00
vmalloc.c	mm/vmalloc: use PAGE_ALIGNED() to check PAGE_SIZE alignment	2016-03-17 15:09:34 -07:00
vmpressure.c	mm/vmpressure.c: fix subtree pressure detection	2016-02-03 08:28:43 -08:00
vmscan.c	mm: introduce page reference manipulation functions	2016-03-17 15:09:34 -07:00
vmstat.c	thp, vmstats: count deferred split events	2016-03-17 15:09:34 -07:00
workingset.c	mm: workingset: make shadow node shrinker memcg aware	2016-03-17 15:09:34 -07:00
zbud.c	mm/zbud.c: use list_last_entry() instead of list_tail_entry()	2016-01-15 11:40:52 -08:00
zpool.c	mm: zsmalloc: constify struct zs_pool name	2015-11-06 17:50:42 -08:00
zsmalloc.c	mm/zsmalloc: add `freeable' column to pool stat	2016-03-17 15:09:34 -07:00
zswap.c	mm/zswap: change incorrect strncmp use to strcmp	2015-12-18 14:25:40 -08:00