linux-kernel - [PATCH 4/9] oom: oom_kill_process() need to check p is unkillable

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Date:	Thu, 17 Jun 2010 10:51:42 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	LKML <linux-kernel@...r.kernel.org>, linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>,
	Minchan Kim <minchan.kim@...il.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	kosaki.motohiro@...fujitsu.com
Subject: [PATCH 4/9] oom: oom_kill_process() need to check p is unkillable

When oom_kill_allocating_task is enabled, an argument task of
oom_kill_process is not selected by select_bad_process(), It's
just out_of_memory() caller task. It mean the task can be
unkillable. check it first.

Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
---
 mm/oom_kill.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index afcbf17..541a59b 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -687,7 +687,8 @@ void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask,
 	check_panic_on_oom(constraint, gfp_mask, order);
 
 	read_lock(&tasklist_lock);
-	if (sysctl_oom_kill_allocating_task) {
+	if (sysctl_oom_kill_allocating_task &&
+	    !oom_unkillable_task(current, NULL, nodemask)) {
 		/*
 		 * oom_kill_process() needs tasklist_lock held.  If it returns
 		 * non-zero, current could not be killed so we must fallback to
-- 
1.6.5.2



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