linux-kernel - [PATCH 2/3 for 2.6.38] oom: select_bad_process: ignore TIF

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Message-ID: <20110314190508.GC21845@redhat.com>
Date:	Mon, 14 Mar 2011 20:05:08 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Hugh Dickins <hughd@...gle.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Andrey Vagin <avagin@...nvz.org>,
	David Rientjes <rientjes@...gle.com>,
	Frantisek Hrbata <fhrbata@...hat.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/3 for 2.6.38] oom: select_bad_process: ignore TIF_MEMDIE
	zombies

select_bad_process() assumes that a TIF_MEMDIE process should go away.
But it can only go away it its parent does wait(). Change this check to
ignore the TIF_MEMDIE zombies.

Note: this is _not_ enough. Just a minimal fix.

Signed-off-by: Oleg Nesterov <oleg@...hat.com>
---

 mm/oom_kill.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- 38/mm/oom_kill.c~2_tif_memdie_zombie	2011-03-14 18:51:49.000000000 +0100
+++ 38/mm/oom_kill.c	2011-03-14 18:52:39.000000000 +0100
@@ -311,7 +311,8 @@ static struct task_struct *select_bad_pr
 		 * blocked waiting for another task which itself is waiting
 		 * for memory. Is there a better alternative?
 		 */
-		if (test_tsk_thread_flag(p, TIF_MEMDIE))
+		if (test_tsk_thread_flag(p, TIF_MEMDIE) &&
+		    !p->exit_state && thread_group_empty(p))
 			return ERR_PTR(-1UL);
 
 		/*

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