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| author | Michal Hocko <mhocko@suse.com> | 2018-08-17 15:49:10 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-08-17 16:20:32 -0700 |
| commit | a195d3f5b74f3f45a6742f9063b5e95a2522b46d (patch) | |
| tree | 3de24cc97571ff50527318393f6d033c2a7de766 /mm | |
| parent | 40d18ebffb3974272a920c41f2d74431152cae98 (diff) | |
| download | linux-a195d3f5b74f3f45a6742f9063b5e95a2522b46d.tar.gz linux-a195d3f5b74f3f45a6742f9063b5e95a2522b46d.tar.bz2 linux-a195d3f5b74f3f45a6742f9063b5e95a2522b46d.zip | |
mm/oom_kill.c: document oom_lock
Add comments describing oom_lock's scope.
Requested-by: David Rientjes <rientjes@google.com>
Link: http://lkml.kernel.org/r/20180711120121.25635-1-mhocko@kernel.org
Signed-off-by: Michal Hocko <mhocko@suse.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: David Rientjes <rientjes@google.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>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/oom_kill.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/mm/oom_kill.c b/mm/oom_kill.c index cd6520f7553d..412f43453a68 100644 --- a/mm/oom_kill.c +++ b/mm/oom_kill.c @@ -53,6 +53,14 @@ int sysctl_panic_on_oom; int sysctl_oom_kill_allocating_task; int sysctl_oom_dump_tasks = 1; +/* + * Serializes oom killer invocations (out_of_memory()) from all contexts to + * prevent from over eager oom killing (e.g. when the oom killer is invoked + * from different domains). + * + * oom_killer_disable() relies on this lock to stabilize oom_killer_disabled + * and mark_oom_victim + */ DEFINE_MUTEX(oom_lock); #ifdef CONFIG_NUMA |