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449d777d7a
kernel_optimize_test/mm
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Michal Hocko 449d777d7a mm, oom_reaper: clear TIF_MEMDIE for all tasks queued for oom_reaper 
Right now the oom reaper will clear TIF_MEMDIE only for tasks which were
successfully reaped.  This is the safest option because we know that
such an oom victim would only block forward progress of the oom killer
without a good reason because it is highly unlikely it would release
much more memory.  Basically most of its memory has been already torn
down.

We can relax this assumption to catch more corner cases though.

The first obvious one is when the oom victim clears its mm and gets
stuck later on.  oom_reaper would back of on find_lock_task_mm returning
NULL.  We can safely try to clear TIF_MEMDIE in this case because such a
task would be ignored by the oom killer anyway.  The flag would be
cleared by that time already most of the time anyway.

The less obvious one is when the oom reaper fails due to mmap_sem
contention.  Even if we clear TIF_MEMDIE for this task then it is not
very likely that we would select another task too easily because we
haven't reaped the last victim and so it would be still the #1
candidate.  There is a rare race condition possible when the current
victim terminates before the next select_bad_process but considering
that oom_reap_task had retried several times before giving up then this
sounds like a borderline thing.

After this patch we should have a guarantee that the OOM killer will not
be block for unbounded amount of time for most cases.

Signed-off-by: Michal Hocko <mhocko@suse.com>
Cc: Raushaniya Maksudova <rmaksudova@parallels.com>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Daniel Vetter <daniel.vetter@intel.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-05-19 19:12:14 -07:00
..
kasan mm, kasan: fix compilation for CONFIG_SLAB 2016-04-01 17:03:37 -05:00
backing-dev.c writeback: fix the wrong congested state variable definition 2016-03-31 12:26:25 -06:00
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, compaction: skip blocks where isolation fails in async direct compaction 2016-05-19 19:12:14 -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 mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros 2016-04-04 10:41:08 -07:00
failslab.c mm: fault-inject take over bootstrap kmem_cache check 2016-03-15 16:55:16 -07:00
filemap.c mm/page_ref: use page_ref helper instead of direct modification of _count 2016-05-19 19:12:14 -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 Merge branch 'mm-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-04-14 19:31:34 -07:00
highmem.c mm/highmem: make nr_free_highpages() handles all highmem zones by itself 2016-05-19 19:12:14 -07:00
huge_memory.c huge mm: move_huge_pmd does not need new_vma 2016-05-19 19:12:14 -07:00
hugetlb_cgroup.c mm: make compound_head() robust 2015-11-06 17:50:42 -08:00
hugetlb.c mm/hugetlb: add same zone check in pfn_range_valid_gigantic() 2016-05-19 19:12:14 -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: rename _count, field of the struct page, to _refcount 2016-05-19 19:12:14 -07:00
interval_tree.c
Kconfig memory_hotplug: introduce CONFIG_MEMORY_HOTPLUG_DEFAULT_ONLINE 2016-05-19 19:12:14 -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 ksm: fix conflict between mmput and scan_get_next_rmap_item 2016-05-12 15:52:50 -07:00
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, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros 2016-04-04 10:41:08 -07:00
Makefile mm, kasan: SLAB support 2016-03-25 16:37:42 -07:00
memblock.c mm: coalesce split strings 2016-03-17 15:09:34 -07:00
memcontrol.c oom, oom_reaper: try to reap tasks which skip regular OOM killer path 2016-05-19 19:12:14 -07:00
memory_hotplug.c memory_hotplug: introduce memhp_default_state= command line parameter 2016-05-19 19:12:14 -07:00
memory-failure.c mm/memory-failure: fix race with compound page split/merge 2016-04-28 19:34:04 -07:00
memory.c mm: thp: calculate the mapcount correctly for THP pages during WP faults 2016-05-12 15:52:50 -07:00
mempolicy.c mm/mempolicy.c:offset_il_node() document and clarify 2016-05-19 19:12:14 -07:00
mempool.c mm, kasan: add GFP flags to KASAN API 2016-03-25 16:37:42 -07:00
memtest.c memtest: remove unused header files 2015-09-08 15:35:28 -07:00
migrate.c mm: use __SetPageSwapBacked and dont ClearPageSwapBacked 2016-05-19 19:12:14 -07:00
mincore.c mm, fs: remove remaining PAGE_CACHE_* and page_cache_{get,release} usage 2016-04-04 10:41:08 -07:00
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 mm/mmap: kill hook arch_rebalance_pgtables() 2016-05-19 19:12:14 -07:00
mmu_context.c mm/mmu_context, sched/core: Fix mmu_context.h assumption 2016-04-28 11:44:19 +02:00
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 huge pagecache: extend mremap pmd rmap lockout to files 2016-05-19 19:12:14 -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-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-04-14 19:31:34 -07:00
oom_kill.c mm, oom_reaper: clear TIF_MEMDIE for all tasks queued for oom_reaper 2016-05-19 19:12:14 -07:00
page_alloc.c mm, oom: move GFP_NOFS check to out_of_memory 2016-05-19 19:12:14 -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 Merge branch 'work.preadv2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-05-17 15:05:23 -07:00
page_isolation.c mm/memory_hotplug: add comment to some functions related to memory hotplug 2016-05-19 19:12:14 -07:00
page_owner.c mm/page_owner: add zone range overlapping check 2016-05-19 19:12:14 -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/writeback: correct dirty page calculation for highmem 2016-05-19 19:12:14 -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, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros 2016-04-04 10:41:08 -07:00
rmap.c mm: use __SetPageSwapBacked and dont ClearPageSwapBacked 2016-05-19 19:12:14 -07:00
shmem.c tmpfs: mem_cgroup charge fault to vm_mm not current mm 2016-05-19 19:12:14 -07:00
slab_common.c mm, kasan: add GFP flags to KASAN API 2016-03-25 16:37:42 -07:00
slab.c include/linux/nodemask.h: create next_node_in() helper 2016-05-19 19:12:14 -07:00
slab.h mm, kasan: add GFP flags to KASAN API 2016-03-25 16:37:42 -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: rename _count, field of the struct page, to _refcount 2016-05-19 19:12:14 -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: use __SetPageSwapBacked and dont ClearPageSwapBacked 2016-05-19 19:12:14 -07:00
swap.c thp: keep huge zero page pinned until tlb flush 2016-04-28 19:34:04 -07:00
swapfile.c mm: thp: calculate the mapcount correctly for THP pages during WP faults 2016-05-12 15:52:50 -07:00
truncate.c mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros 2016-04-04 10:41:08 -07:00
userfaultfd.c mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros 2016-04-04 10:41:08 -07:00
util.c mm: uninline page_mapped() 2016-05-19 19:12:14 -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: update_lru_size do the __mod_zone_page_state 2016-05-19 19:12:14 -07:00
vmstat.c mm: /proc/sys/vm/stat_refresh to force vmstat update 2016-05-19 19:12:14 -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 zsmalloc: fix zs_can_compact() integer overflow 2016-05-09 17:40:59 -07:00
zswap.c mm/zswap: provide unique zpool name 2016-05-05 17:38:53 -07:00