linux-kernel - [PATCH] oom: skip frozen tasks

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Message-ID: <20110823073101.6426.77745.stgit@zurg>
Date:	Tue, 23 Aug 2011 11:31:01 +0300
From:	Konstantin Khlebnikov <khlebnikov@...nvz.org>
To:	linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Oleg Nesterov <oleg@...hat.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	David Rientjes <rientjes@...gle.com>
Subject: [PATCH] oom: skip frozen tasks

All frozen tasks are unkillable, and if one of them has TIF_MEMDIE
we must kill something else to avoid deadlock. After this patch
select_bad_process() will skip frozen task before checking TIF_MEMDIE.

Signed-off-by: Konstantin Khlebnikov <khlebnikov@...nvz.org>
---
 mm/oom_kill.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 626303b..931ab20 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -138,6 +138,8 @@ static bool oom_unkillable_task(struct task_struct *p,
 		return true;
 	if (p->flags & PF_KTHREAD)
 		return true;
+	if (p->flags & PF_FROZEN)
+		return true;
 
 	/* When mem_cgroup_out_of_memory() and p is not member of the group */
 	if (mem && !task_in_mem_cgroup(p, mem))

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