Michal Hocko 7655f8554e OOM, PM: OOM killed task shouldn't escape PM suspend ... commit 5695be142e203167e3cb515ef86a88424f3524eb upstream. 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) Signed-off-by: Michal Hocko <mhocko@suse.cz> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Zefan Li <lizefan@huawei.com>		2015-02-02 17:04:55 +08:00
..
debug	kdb,vt_console: Fix missed data due to pager overruns	2012-10-21 09:27:59 -07:00
events	perf: Handle compat ioctl	2014-12-01 18:02:42 +08:00
gcov	…
irq	genirq: Sanitize spurious interrupt detection of threaded irqs	2014-06-30 20:01:33 -07:00
power	OOM, PM: OOM killed task shouldn't escape PM suspend	2015-02-02 17:04:55 +08:00
sched	printk: rename printk_sched to printk_deferred	2014-08-07 12:00:10 -07:00
time	alarmtimer: Lock k_itimer during timer callback	2014-12-01 18:02:31 +08:00
trace	tracing: Remove ftrace_stop/start() from reading the trace file	2014-07-17 15:39:50 -07:00
.gitignore	…
Kconfig.freezer	…
Kconfig.hz	…
Kconfig.locks	locking/kconfig: Simplify INLINE_SPIN_UNLOCK usage	2012-03-23 13:18:57 +01:00
Kconfig.preempt	locking/kconfig: Simplify INLINE_SPIN_UNLOCK usage	2012-03-23 13:18:57 +01:00
Makefile	sysctl: Move the implementation into fs/proc/proc_sysctl.c	2012-01-24 16:37:54 -08:00
acct.c	Merge branch 'for-linus2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2012-01-08 12:19:57 -08:00
async.c	Fix a dead loop in async_synchronize_full()	2012-10-02 10:30:35 -07:00
audit.c	audit: wait_for_auditd() should use TASK_UNINTERRUPTIBLE	2014-04-14 06:44:15 -07:00
audit.h	audit: remove AUDIT_SETUP_CONTEXT as it isn't used	2012-01-17 16:16:57 -05:00
audit_tree.c	kernel/audit_tree.c: tree will leak memory when failure occurs in audit_trim_trees()	2013-05-11 13:48:14 -07:00
audit_watch.c	…
auditfilter.c	audit: allow interfield comparison in audit rules	2012-01-17 16:17:01 -05:00
auditsc.c	auditsc: audit_krule mask accesses need bounds checking	2014-06-16 13:45:46 -07:00
backtracetest.c	…
bounds.c	…
capability.c	Revert "capabitlies: ns_capable can use the cap helpers rather than lsm call"	2012-01-17 10:19:41 -08:00
cgroup.c	cgroup: reject cgroup names with ' '	2014-12-01 18:02:23 +08:00
cgroup_freezer.c	cgroup: cgroup_subsys->fork() should be called after the task is added to css_set	2014-03-11 16:10:03 -07:00
compat.c	compat: Fix RT signal mask corruption via sigprocmask	2012-05-10 08:58:33 -07:00
configs.c	…
cpu.c	sched: Fix hotplug vs. set_cpus_allowed_ptr()	2014-06-11 12:04:11 -07:00
cpu_pm.c	…
cpuset.c	cpuset: PF_SPREAD_PAGE and PF_SPREAD_SLAB should be atomic flags	2014-12-01 18:02:38 +08:00
crash_dump.c	…
cred.c	cred: copy_process() should clear child->replacement_session_keyring	2012-04-11 08:20:11 -07:00
delayacct.c	…
dma.c	Remove all #inclusions of asm/system.h	2012-03-28 18:30:03 +01:00
elfcore.c	…
exec_domain.c	…
exit.c	introduce for_each_thread() to replace the buggy while_each_thread()	2015-02-02 17:04:55 +08:00
extable.c	…
fork.c	introduce for_each_thread() to replace the buggy while_each_thread()	2015-02-02 17:04:55 +08:00
freezer.c	freezer: Do not freeze tasks killed by OOM killer	2015-02-02 17:04:54 +08:00
futex.c	futex: Ensure get_futex_key_refs() always implies a barrier	2015-02-02 17:04:51 +08:00
futex_compat.c	futex: Revert "futex: Mark get_robust_list as deprecated"	2013-02-28 06:59:01 -08:00
groups.c	…
hrtimer.c	hrtimer: Set expiry time before switch_hrtimer_base()	2014-06-07 16:02:01 -07:00
hung_task.c	hung_task: fix the broken rcu_lock_break() logic	2012-03-05 15:49:42 -08:00
irq_work.c	irq_work: fix compile failure on tile from missing include	2012-04-13 13:15:16 -04:00
itimer.c	itimer: Use printk_once instead of WARN_ONCE	2012-04-10 11:00:30 +02:00
jump_label.c	static keys: Inline the static_key_enabled() function	2012-02-28 20:01:08 +01:00
kallsyms.c	…
kexec.c	Merge branch 'akpm' (Andrew's patch-bomb)	2012-03-28 17:19:28 -07:00
kfifo.c	…
kmod.c	usermodehelper: check subprocess_info->path != NULL	2013-05-19 10:54:50 -07:00
kprobes.c	kprobes: return proper error code from register_kprobe()	2012-03-05 15:49:42 -08:00
ksysfs.c	…
kthread.c	kthread_worker: reimplement flush_kthread_work() to allow freeing the work item being executed	2012-10-02 10:30:40 -07:00
latencytop.c	…
lockdep.c	lockdep: Add CPU-idle/offline warning to lockdep-RCU splat	2012-02-21 09:06:06 -08:00
lockdep_internals.h	…
lockdep_proc.c	…
lockdep_states.h	…
module.c	ftrace/module: Hardcode ftrace_module_init() call into load_module()	2014-06-07 16:02:00 -07:00
mutex-debug.c	…
mutex-debug.h	…
mutex.c	sched/rt: Use schedule_preempt_disabled()	2012-03-01 10:28:03 +01:00
mutex.h	…
notifier.c	…
nsproxy.c	…
padata.c	padata: Fix cpu hotplug	2012-03-29 19:52:46 +08:00
panic.c	panic: fix a possible deadlock in panic()	2013-04-12 09:38:47 -07:00
params.c	params: <level>_initcall-like kernel parameters	2012-03-26 12:50:51 +10:30
pid.c	vfs: fix panic in __d_lookup() with high dentry hashtable counts	2012-02-13 20:45:38 -05:00
pid_namespace.c	pidns: add reboot_pid_ns() to handle the reboot syscall	2012-03-28 17:14:36 -07:00
posix-cpu-timers.c	posix-cpu-timers: Fix nanosleep task_struct leak	2013-02-28 06:58:59 -08:00
posix-timers.c	posix-timer: Don't call idr_find() with out-of-range ID	2013-03-04 06:06:38 +08:00
printk.c	printk: rename printk_sched to printk_deferred	2014-08-07 12:00:10 -07:00
profile.c	…
ptrace.c	exec/ptrace: fix get_dumpable() incorrect tests	2013-11-29 10:50:34 -08:00
range.c	…
rcu.h	rcu: Allow nesting of rcu_idle_enter() and rcu_idle_exit()	2012-02-21 09:06:12 -08:00
rcupdate.c	rcu: Check for illegal use of RCU from offlined CPUs	2012-02-21 09:06:03 -08:00
rcutiny.c	rcu: Add RCU_NONIDLE() for idle-loop RCU read-side critical sections	2012-02-21 09:06:13 -08:00
rcutiny_plugin.h	rcu: Simplify unboosting checks	2012-02-21 09:03:43 -08:00
rcutorture.c	PTR_ERR should be called before its argument is cleared.	2012-02-21 09:06:10 -08:00
rcutree.c	rcu: Fix batch-limit size problem	2012-12-17 10:37:46 -08:00
rcutree.h	rcu: Rework detection of use of RCU by offline CPUs	2012-02-21 09:06:07 -08:00
rcutree_plugin.h	rcu: Hold off RCU_FAST_NO_HZ after timer posted	2012-02-21 09:42:30 -08:00
rcutree_trace.c	rcu: Rework detection of use of RCU by offline CPUs	2012-02-21 09:06:07 -08:00
relay.c	splice: fix racy pipe->buffers uses	2012-07-16 09:04:42 -07:00
res_counter.c	net: introduce res_counter_charge_nofail() for socket allocations	2012-01-22 15:08:46 -05:00
resource.c	kernel/resource.c: fix stack overflow in __reserve_region_with_split()	2013-02-14 10:48:53 -08:00
rtmutex-debug.c	…
rtmutex-debug.h	rtmutex: Handle deadlock detection smarter	2014-07-17 15:39:50 -07:00
rtmutex-tester.c	rtmutex-tester: convert sysdev_class to a regular subsystem	2011-12-14 14:54:22 -08:00
rtmutex.c	rtmutex: Plug slow unlock race	2014-07-17 15:39:50 -07:00
rtmutex.h	rtmutex: Handle deadlock detection smarter	2014-07-17 15:39:50 -07:00
rtmutex_common.h	…
rwsem.c	Remove all #inclusions of asm/system.h	2012-03-28 18:30:03 +01:00
seccomp.c	seccomp: audit abnormal end to a process due to seccomp	2012-01-17 16:16:55 -05:00
semaphore.c	…
signal.c	kernel/signal.c: stop info leak via the tkill and the tgkill syscalls	2013-04-25 21:19:54 -07:00
smp.c	smp: Fix SMP function call empty cpu mask race	2013-02-03 18:24:42 -06:00
softirq.c	Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2012-03-20 10:32:09 -07:00
spinlock.c	locking/kconfig: Simplify INLINE_SPIN_UNLOCK usage	2012-03-23 13:18:57 +01:00
srcu.c	rcu: Call out dangers of expedited RCU primitives	2012-02-21 09:06:08 -08:00
stacktrace.c	…
stop_machine.c	…
sys.c	reboot: rigrate shutdown/reboot to boot cpu	2013-06-20 11:58:45 -07:00
sys_ni.c	…
sysctl.c	hung_task: check the value of "sysctl_hung_task_timeout_sec"	2014-05-06 07:51:45 -07:00
sysctl_binary.c	sysctl: fix null checking in bin_dn_node_address()	2013-03-04 06:06:41 +08:00
taskstats.c	…
test_kprobes.c	…
time.c	jiffies: Fix timeval conversion to jiffies	2014-12-01 18:02:32 +08:00
timeconst.pl	timeconst.pl: Eliminate Perl warning	2013-02-28 06:58:58 -08:00
timer.c	timer: Prevent overflow in apply_slack	2014-06-07 16:02:00 -07:00
tracepoint.c	tracepoint: Do not waste memory on mods with no tracepoints	2014-05-18 05:25:56 -07:00
tsacct.c	[S390] cputime: add sparse checking and cleanup	2011-12-15 14:56:19 +01:00
uid16.c	…
up.c	…
user-return-notifier.c	…
user.c	…
user_namespace.c	…
utsname.c	…
utsname_sysctl.c	…
wait.c	lockdep/waitqueues: Add better annotation	2011-12-21 10:07:39 +01:00
watchdog.c	watchdog: using u64 in get_sample_period()	2012-12-03 11:47:17 -08:00
workqueue.c	workqueue: cond_resched() after processing each work item	2014-04-14 06:44:16 -07:00
workqueue_sched.h	…