[024/165] mm, oom: show process exiting information in __oom_kill_process()

Commit Message

Andrew Morton Aug. 12, 2020, 1:31 a.m. UTC

From: Yafang Shao <[e-mail]>
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/[e-mail]
Signed-off-by: Yafang Shao <[e-mail]>
Suggested-by: David Rientjes <[e-mail]>
Acked-by: Michal Hocko <[e-mail]>
Cc: Tetsuo Handa <[e-mail]>
Cc: Qian Cai <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
---

 mm/oom_kill.c |    2 ++
 1 file changed, 2 insertions(+)

Patch

--- 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) {