The patch titled
Subject: mm, oom: show process exiting information in __oom_kill_process()
has been added to the -mm tree. Its filename is
mm-oom-show-process-exiting-information-in-__oom_kill_process.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-oom-show-process-exiting-information-in-__oom_kill_process.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-oom-show-process-exiting-information-in-__oom_kill_process.patch
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------------------------------------------------------
From: Yafang Shao <laoar.shao@xxxxxxxxx>
Subject: mm, oom: show process exiting information in __oom_kill_process()
When the OOM killer finds a victim and tryies to kill it, if the victim is
already exiting, the task mm will be NULL and no process will be killed.
But the dump_header() has been already executed, so it will be strange to
dump so much information without killing a process. We'd better show some
helpful information to indicate why this happens.
Link: http://lkml.kernel.org/r/20200721010127.17238-1-laoar.shao@xxxxxxxxx
Suggested-by: David Rientjes <rientjes@xxxxxxxxxx>
Signed-off-by: Yafang Shao <laoar.shao@xxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
Cc: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
Cc: Qian Cai <cai@xxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/oom_kill.c | 2 ++
1 file changed, 2 insertions(+)
--- a/mm/oom_kill.c~mm-oom-show-process-exiting-information-in-__oom_kill_process
+++ a/mm/oom_kill.c
@@ -861,6 +861,8 @@ static void __oom_kill_process(struct ta
p = find_lock_task_mm(victim);
if (!p) {
+ pr_info("%s: OOM victim %d (%s) is already exiting. Skip killing the task\n",
+ message, task_pid_nr(victim), victim->comm);
put_task_struct(victim);
return;
} else if (victim != p) {
_
Patches currently in -mm which might be from laoar.shao@xxxxxxxxx are
mm-memcg-avoid-stale-protection-values-when-cgroup-is-above-protection.patch
memcg-oom-check-memcg-margin-for-parallel-oom.patch
mm-oom-make-the-calculation-of-oom-badness-more-accurate.patch
mm-oom-make-the-calculation-of-oom-badness-more-accurate-v3.patch
mm-oom-show-process-exiting-information-in-__oom_kill_process.patch
