[patch 096/111] mm/oom_kill.c: document oom_lock

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From: Michal Hocko <mhocko@xxxxxxxx>
Subject: mm/oom_kill.c: document oom_lock

Add comments describing oom_lock's scope.

Requested-by: David Rientjes <rientjes@xxxxxxxxxx>
Link: http://lkml.kernel.org/r/20180711120121.25635-1-mhocko@xxxxxxxxxx
Signed-off-by: Michal Hocko <mhocko@xxxxxxxx>
Reviewed-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 mm/oom_kill.c |    8 ++++++++
 1 file changed, 8 insertions(+)

--- a/mm/oom_kill.c~mm-oom-document-oom_lock
+++ a/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
_



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