Commit 121d1ba0 authored Jul 31, 2012 by David Rientjes Committed by Linus Torvalds Jul 31, 2012

mm, oom: fix potential killing of thread that is disabled from oom killing



/proc/sys/vm/oom_kill_allocating_task will immediately kill current when
the oom killer is called to avoid a potentially expensive tasklist scan
for large systems.

Currently, however, it is not checking current's oom_score_adj value which
may be OOM_SCORE_ADJ_MIN, meaning that it has been disabled from oom
killing.

This patch avoids killing current in such a condition and simply falls
back to the tasklist scan since memory still needs to be freed.

Signed-off-by: David Rientjes <rientjes@google.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 2a13515c

mm/oom_kill.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -719,9 +719,9 @@ void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask,
		check_panic_on_oom(constraint, gfp_mask, order, mpol_mask);

		read_lock(&tasklist_lock);
		if (sysctl_oom_kill_allocating_task &&
		if (sysctl_oom_kill_allocating_task && current->mm &&
		!oom_unkillable_task(current, NULL, nodemask) &&
		current->mm) {
		current->signal->oom_score_adj != OOM_SCORE_ADJ_MIN) {
		oom_kill_process(current, gfp_mask, order, 0, totalpages, NULL,
		nodemask,
		"Out of memory (oom_kill_allocating_task)");