The patch titled
Subject: mm/oom_kill.c: document oom_lock
has been added to the -mm tree. Its filename is
mm-oom-document-oom_lock.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-oom-document-oom_lock.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-oom-document-oom_lock.patch
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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>
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(+)
diff -puN mm/oom_kill.c~mm-oom-document-oom_lock mm/oom_kill.c
--- a/mm/oom_kill.c~mm-oom-document-oom_lock
+++ a/mm/oom_kill.c
@@ -54,6 +54,14 @@ 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
_
Patches currently in -mm which might be from mhocko@xxxxxxxx are
memblock-do-not-complain-about-top-down-allocations-for-memory_hotremove.patch
mm-do-not-bug_on-on-incorrect-lenght-in-__mm_populate.patch
mm-drop-vm_bug_on-from-__get_free_pages.patch
memcg-oom-move-out_of_memory-back-to-the-charge-path.patch
mm-oom-remove-sleep-from-under-oom_lock.patch
mm-oom-document-oom_lock.patch
mm-oom-docs-describe-the-cgroup-aware-oom-killer-fix-2.patch
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