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mm, oom: show process exiting information in __oom_kill_process()

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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.

Suggested-by: David Rientjes <rientjes@google.com>
Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Cc: Qian Cai <cai@lca.pw>
Link: http://lkml.kernel.org/r/20200721010127.17238-1-laoar.shao@gmail.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Yafang Shao 2020-08-11 18:31:32 -07:00 committed by Linus Torvalds
parent b1aa7c9377
commit 619b5b469b
1 changed files with 2 additions and 0 deletions
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mm/oom_kill.c
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@ -861,6 +861,8 @@ static void __oom_kill_process(struct task_struct *victim, const char *message)
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) {