linux-kernel - [PATCH 01/12] oom: select_bad_process: check PF

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Message-Id: <20100603144841.724A.A69D9226@jp.fujitsu.com>
Date:	Thu,  3 Jun 2010 14:49:48 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	"Luis Claudio R. Goncalves" <lclaudio@...g.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>, Oleg Nesterov <oleg@...hat.com>,
	David Rientjes <rientjes@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Nick Piggin <npiggin@...e.de>
Cc:	kosaki.motohiro@...fujitsu.com
Subject: [PATCH 01/12] oom: select_bad_process: check PF_KTHREAD instead of !mm to skip kthreads

From: Oleg Nesterov <oleg@...hat.com>

select_bad_process() thinks a kernel thread can't have ->mm != NULL, this
is not true due to use_mm().

Change the code to check PF_KTHREAD.

Signed-off-by: Oleg Nesterov <oleg@...hat.com>
Acked-by: David Rientjes <rientjes@...gle.com>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Reviewed-by: Minchan Kim <minchan.kim@...il.com>
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
---
 mm/oom_kill.c |    9 +++------
 1 files changed, 3 insertions(+), 6 deletions(-)

diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 709aedf..070b713 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -256,14 +256,11 @@ static struct task_struct *select_bad_process(unsigned long *ppoints,
 	for_each_process(p) {
 		unsigned long points;
 
-		/*
-		 * skip kernel threads and tasks which have already released
-		 * their mm.
-		 */
+		/* skip the tasks which have already released their mm. */
 		if (!p->mm)
 			continue;
-		/* skip the init task */
-		if (is_global_init(p))
+		/* skip the init task and kthreads */
+		if (is_global_init(p) || (p->flags & PF_KTHREAD))
 			continue;
 		if (mem && !task_in_mem_cgroup(p, mem))
 			continue;
-- 
1.6.5.2



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