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. Suggested-by: David Rientjes <[email protected]> Signed-off-by: Yafang Shao <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Acked-by: Michal Hocko <[email protected]> Cc: Tetsuo Handa <[email protected]> Cc: Qian Cai <[email protected]> Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Linus Torvalds <[email protected]>
sm00th · Aug 12, 2020 · 619b5b4 · 619b5b4
1 parent b1aa7c9
commit 619b5b4
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
@@ -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) {