Michal Hocko 5695be142e OOM, PM: OOM killed task shouldn't escape PM suspend ... PM freezer relies on having all tasks frozen by the time devices are getting frozen so that no task will touch them while they are getting frozen. But OOM killer is allowed to kill an already frozen task in order to handle OOM situtation. In order to protect from late wake ups OOM killer is disabled after all tasks are frozen. This, however, still keeps a window open when a killed task didn't manage to die by the time freeze_processes finishes. Reduce the race window by checking all tasks after OOM killer has been disabled. This is still not race free completely unfortunately because oom_killer_disable cannot stop an already ongoing OOM killer so a task might still wake up from the fridge and get killed without freeze_processes noticing. Full synchronization of OOM and freezer is, however, too heavy weight for this highly unlikely case. Introduce and check oom_kills counter which gets incremented early when the allocator enters __alloc_pages_may_oom path and only check all the tasks if the counter changes during the freezing attempt. The counter is updated so early to reduce the race window since allocator checked oom_killer_disabled which is set by PM-freezing code. A false positive will push the PM-freezer into a slow path but that is not a big deal. Changes since v1 - push the re-check loop out of freeze_processes into check_frozen_processes and invert the condition to make the code more readable as per Rafael Fixes: f660daac47 (oom: thaw threads if oom killed thread is frozen before deferring) Cc: 3.2+ <stable@vger.kernel.org> # 3.2+ Signed-off-by: Michal Hocko <mhocko@suse.cz> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>		2014-10-21 23:44:21 +02:00
..
backing-dev.c	Merge branch 'for-3.18/core' of git://git.kernel.dk/linux-block	2014-10-18 11:53:51 -07:00
balloon_compaction.c	mm/balloon_compaction: add vmstat counters and kpageflags bit	2014-10-09 22:26:01 -04:00
bootmem.c	mm/bootmem.c: use include/linux/ headers	2014-10-09 22:26:00 -04:00
cleancache.c	mm: dump page when hitting a VM_BUG_ON using VM_BUG_ON_PAGE	2014-01-23 16:36:50 -08:00
cma.c	drivers: dma-contiguous: add initialization from device tree	2014-10-14 02:18:12 +02:00
compaction.c	mm/balloon_compaction: redesign ballooned pages management	2014-10-09 22:26:01 -04:00
debug-pagealloc.c
debug.c	mm/debug.c: use pr_emerg()	2014-10-09 22:25:59 -04:00
dmapool.c	mm/dmapool.c: fixed a brace coding style issue	2014-10-09 22:26:00 -04:00
early_ioremap.c	mm: create generic early_ioremap() support	2014-04-07 16:36:15 -07:00
fadvise.c	teach SYSCALL_DEFINE<n> how to deal with long long/unsigned long long	2013-03-03 22:46:22 -05:00
failslab.c
filemap_xip.c	seqcount: Add lockdep functionality to seqcount/seqlock structures	2013-11-06 12:40:26 +01:00
filemap.c	mm/filemap.c: remove trailing whitespace	2014-10-09 22:26:00 -04:00
fremap.c	mm: mark remap_file_pages() syscall as deprecated	2014-06-06 16:08:17 -07:00
frontswap.c	swap: change swap_list_head to plist, add swap_avail_head	2014-06-04 16:54:07 -07:00
gup.c	mm: introduce a general RCU get_user_pages_fast()	2014-10-09 22:26:00 -04:00
highmem.c	mm/highmem: make kmap cache coloring aware	2014-08-06 18:01:22 -07:00
huge_memory.c	mm: use VM_BUG_ON_MM where possible	2014-10-09 22:25:58 -04:00
hugetlb_cgroup.c	hugetlb_cgroup: use lockdep_assert_held rather than spin_is_locked	2014-08-29 16:28:16 -07:00
hugetlb.c	mm: convert a few VM_BUG_ON callers to VM_BUG_ON_VMA	2014-10-09 22:25:57 -04:00
hwpoison-inject.c	mm/hwpoison-inject.c: remove unnecessary null test before debugfs_remove_recursive	2014-08-06 18:01:19 -07:00
init-mm.c
internal.h	mm, compaction: pass gfp mask to compact_control	2014-10-09 22:25:55 -04:00
interval_tree.c	mm: convert a few VM_BUG_ON callers to VM_BUG_ON_VMA	2014-10-09 22:25:57 -04:00
iov_iter.c	Add copy_to_iter(), copy_from_iter() and iov_iter_zero()	2014-10-09 02:39:03 -04:00
Kconfig	mm/balloon_compaction: add vmstat counters and kpageflags bit	2014-10-09 22:26:01 -04:00
Kconfig.debug
kmemcheck.c	mm/slab_common: move kmem_cache definition to internal header	2014-10-09 22:25:50 -04:00
kmemleak-test.c	mm/kmemleak-test.c: use pr_fmt for logging	2014-06-06 16:08:18 -07:00
kmemleak.c	mm: introduce kmemleak_update_trace()	2014-06-06 16:08:17 -07:00
ksm.c	mm: ksm use pr_err instead of printk	2014-10-09 22:26:00 -04:00
list_lru.c	mm: keep page cache radix tree nodes in check	2014-04-03 16:21:01 -07:00
maccess.c
madvise.c	mm: update the description for madvise_remove	2014-08-06 18:01:18 -07:00
Makefile	Fixup for 3.18: use PATCHv2 of "mm: Support compiling out madvise and fadvise"	2014-10-12 09:21:57 -04:00
memblock.c	mem-hotplug: let memblock skip the hotpluggable memory regions in __next_mem_range()	2014-09-10 15:42:12 -07:00
memcontrol.c	memcg: zap memcg_can_account_kmem	2014-10-09 22:26:00 -04:00
memory_hotplug.c	memory-hotplug: add sysfs valid_zones attribute	2014-10-09 22:25:52 -04:00
memory-failure.c	cgroup: remove redundant check in cgroup_ino()	2014-09-19 09:16:23 -04:00
memory.c	mm: softdirty: enable write notifications on VMAs after VM_SOFTDIRTY cleared	2014-10-14 02:18:28 +02:00
mempolicy.c	mm: mempolicy: skip inaccessible VMAs when setting MPOL_MF_LAZY	2014-10-09 22:26:02 -04:00
mempool.c	mm/mempool.c: update the kmemleak stack trace for mempool allocations	2014-06-06 16:08:17 -07:00
migrate.c	mm/balloon_compaction: redesign ballooned pages management	2014-10-09 22:26:01 -04:00
mincore.c	mm + fs: prepare for non-page entries in page cache radix trees	2014-04-03 16:21:00 -07:00
mlock.c	Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2014-10-13 15:44:12 +02:00
mm_init.c	mm: bring back /sys/kernel/mm	2014-01-27 21:02:39 -08:00
mmap.c	mm: softdirty: enable write notifications on VMAs after VM_SOFTDIRTY cleared	2014-10-14 02:18:28 +02:00
mmu_context.c	sched/mm: call finish_arch_post_lock_switch in idle_task_exit and use_mm	2014-02-21 08:50:17 +01:00
mmu_notifier.c	kvm: Fix page ageing bugs	2014-09-24 14:07:58 +02:00
mmzone.c	mm: numa: Change page last {nid,pid} into {cpu,pid}	2013-10-09 14:47:45 +02:00
mprotect.c	mm: softdirty: enable write notifications on VMAs after VM_SOFTDIRTY cleared	2014-10-14 02:18:28 +02:00
mremap.c	mm/mremap.c: use linux headers	2014-10-09 22:26:00 -04:00
msync.c	msync: fix incorrect fstart calculation	2014-07-03 09:21:53 -07:00
nobootmem.c	mem-hotplug: let memblock skip the hotpluggable memory regions in __next_mem_range()	2014-09-10 15:42:12 -07:00
nommu.c	percpu_counter: add @gfp to percpu_counter_init()	2014-09-08 09:51:29 +09:00
oom_kill.c	OOM, PM: OOM killed task shouldn't escape PM suspend	2014-10-21 23:44:21 +02:00
page_alloc.c	OOM, PM: OOM killed task shouldn't escape PM suspend	2014-10-21 23:44:21 +02:00
page_cgroup.c	mm/page_cgroup.c: mark functions as static	2014-04-03 16:21:02 -07:00
page_io.c	fix __swap_writepage() compile failure on old gcc versions	2014-06-14 19:30:48 -05:00
page_isolation.c	mm: memory-hotplug: enable memory hotplug to handle hugepage	2013-09-11 15:57:48 -07:00
page-writeback.c	Merge branch 'for-3.18' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu	2014-10-10 07:26:02 -04:00
pagewalk.c	mm: use VM_BUG_ON_MM where possible	2014-10-09 22:25:58 -04:00
percpu-km.c	percpu: implmeent pcpu_nr_empty_pop_pages and chunk->nr_populated	2014-09-02 14:46:05 -04:00
percpu-vm.c	percpu: move region iterations out of pcpu_[de]populate_chunk()	2014-09-02 14:46:02 -04:00
percpu.c	percpu: fix how @gfp is interpreted by the percpu allocator	2014-10-08 12:01:52 -04:00
pgtable-generic.c	mm: actually clear pmd_numa before invalidating	2014-08-29 16:28:15 -07:00
process_vm_access.c	start adding the tag to iov_iter	2014-05-06 17:32:49 -04:00
quicklist.c
readahead.c	mm/readahead.c: remove unused file_ra_state from count_history_pages	2014-08-06 18:01:15 -07:00
rmap.c	mm: convert a few VM_BUG_ON callers to VM_BUG_ON_VMA	2014-10-09 22:25:57 -04:00
shmem.c	Merge branch 'for-3.18' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu	2014-10-10 07:26:02 -04:00
slab_common.c	memcg: move memcg_update_cache_size() to slab_common.c	2014-10-09 22:25:59 -04:00
slab.c	mm/slab: fix unaligned access on sparc64	2014-10-14 02:18:12 +02:00
slab.h	mm/slab: use percpu allocator for cpu cache	2014-10-09 22:25:51 -04:00
slob.c	mm/sl[ao]b: always track caller in kmalloc_(node_)track_caller()	2014-10-09 22:25:50 -04:00
slub.c	mm/slab_common: commonize slab merge logic	2014-10-09 22:25:51 -04:00
sparse-vmemmap.c	mm/sparse: use memblock apis for early memory allocations	2014-01-21 16:19:47 -08:00
sparse.c	mm: use macros from compiler.h instead of __attribute__((...))	2014-04-07 16:35:54 -07:00
swap_state.c	mm: memcontrol: do not kill uncharge batching in free_pages_and_swap_cache	2014-10-09 22:25:59 -04:00
swap.c	mm: memcontrol: do not kill uncharge batching in free_pages_and_swap_cache	2014-10-09 22:25:59 -04:00
swapfile.c	mm: memcontrol: rewrite uncharge API	2014-08-08 15:57:17 -07:00
truncate.c	mm: memcontrol: rewrite uncharge API	2014-08-08 15:57:17 -07:00
util.c	proc/maps: make vm_is_stack() logic namespace-friendly	2014-10-09 22:25:50 -04:00
vmacache.c	mm,vmacache: optimize overflow system-wide flushing	2014-06-04 16:53:57 -07:00
vmalloc.c	mm/vmalloc.c: use seq_open_private() instead of seq_open()	2014-10-09 22:25:56 -04:00
vmpressure.c	arm, pm, vmpressure: add missing slab.h includes	2014-02-03 13:24:01 -05:00
vmscan.c	mm: memcontrol: fix transparent huge page allocations under pressure	2014-10-09 22:25:59 -04:00
vmstat.c	vmstat: on-demand vmstat workers V8	2014-10-09 22:26:02 -04:00
workingset.c	mm: keep page cache radix tree nodes in check	2014-04-03 16:21:01 -07:00
zbud.c	zbud: avoid accessing last unused freelist	2014-10-09 22:26:03 -04:00
zpool.c	mm/zpool: use prefixed module loading	2014-08-29 16:28:16 -07:00
zsmalloc.c	zsmalloc: simplify init_zspage free obj linking	2014-10-09 22:26:03 -04:00
zswap.c	mm/zswap.c: add __init to zswap_entry_cache_destroy()	2014-08-08 15:57:18 -07:00