Michal Hocko 7d2e7a22cf oom, suspend: fix oom_killer_disable vs. pm suspend properly ... Commit 7407054209 ("oom, suspend: fix oom_reaper vs. oom_killer_disable race") has workaround an existing race between oom_killer_disable and oom_reaper by adding another round of try_to_freeze_tasks after the oom killer was disabled. This was the easiest thing to do for a late 4.7 fix. Let's fix it properly now. After "oom: keep mm of the killed task available" we no longer have to call exit_oom_victim from the oom reaper because we have stable mm available and hide the oom_reaped mm by MMF_OOM_SKIP flag. So let's remove exit_oom_victim and the race described in the above commit doesn't exist anymore if. Unfortunately this alone is not sufficient for the oom_killer_disable usecase because now we do not have any reliable way to reach exit_oom_victim (the victim might get stuck on a way to exit for an unbounded amount of time). OOM killer can cope with that by checking mm flags and move on to another victim but we cannot do the same for oom_killer_disable as we would lose the guarantee of no further interference of the victim with the rest of the system. What we can do instead is to cap the maximum time the oom_killer_disable waits for victims. The only current user of this function (pm suspend) already has a concept of timeout for back off so we can reuse the same value there. Let's drop set_freezable for the oom_reaper kthread because it is no longer needed as the reaper doesn't wake or thaw any processes. Link: http://lkml.kernel.org/r/1472119394-11342-7-git-send-email-mhocko@kernel.org Signed-off-by: Michal Hocko <mhocko@suse.com> Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Cc: Oleg Nesterov <oleg@redhat.com> Cc: David Rientjes <rientjes@google.com> Cc: Vladimir Davydov <vdavydov@parallels.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2016-10-07 18:46:27 -07:00
..
autosleep.c	PM / Sleep: avoid 'autosleep' in shutdown progress	2013-07-15 01:31:37 +02:00
console.c	PM / sleep: Make pm_prepare_console() return void	2016-06-15 01:26:04 +02:00
hibernate.c	PM / Hibernate: allow hibernation with PAGE_POISONING_ZERO	2016-09-13 02:35:27 +02:00
Kconfig	PM / sleep: Increase default DPM watchdog timeout to 120	2016-09-13 02:15:58 +02:00
main.c	PM / sleep: enable suspend-to-idle even without registered suspend_ops	2016-09-13 02:17:19 +02:00
Makefile	PM / Hibernate: Don't let kasan instrument snapshot.c	2016-06-14 00:38:56 +02:00
power.h	PM / Hibernate: allow hibernation with PAGE_POISONING_ZERO	2016-09-13 02:35:27 +02:00
poweroff.c
process.c	oom, suspend: fix oom_killer_disable vs. pm suspend properly	2016-10-07 18:46:27 -07:00
qos.c	PM / QoS: avoid calling cancel_delayed_work_sync() during early boot	2016-09-05 15:07:53 +02:00
snapshot.c	PM / Hibernate: allow hibernation with PAGE_POISONING_ZERO	2016-09-13 02:35:27 +02:00
suspend_test.c	PM / sleep: Enhance test_suspend option with repeat capability	2014-09-09 01:48:02 +02:00
suspend.c	PM / sleep: enable suspend-to-idle even without registered suspend_ops	2016-09-13 02:17:19 +02:00
swap.c	Power management material for v4.8-rc1	2016-07-26 17:29:07 -07:00
user.c	PM / sleep: make PM notifiers called symmetrically	2016-06-28 00:38:55 +02:00
wakelock.c	PM / autosleep: Use workqueue for user space wakeup sources garbage collector	2015-07-14 21:04:48 +02:00