+ mm-oom-show-process-exiting-information-in-__oom_kill_process.patch added to -mm tree

[akpm@linux-foundation.org]

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@gmail.com>
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@gmail.com
Suggested-by: David Rientjes <rientjes@google.com>
Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Cc: Qian Cai <cai@lca.pw>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 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@gmail.com 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