linux-kernel - [patch] oom: do not dump task state for non thread group leaders

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Message-ID: <alpine.DEB.1.10.0810241641090.31793@chino.kir.corp.google.com>
Date:	Fri, 24 Oct 2008 16:42:04 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Christoph Lameter <cl@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: [patch] oom: do not dump task state for non thread group leaders

When /proc/sys/vm/oom_dump_tasks is enabled, it's only necessary to dump
task state information for thread group leaders.  The kernel log gets
quickly overwhelmed on machines with a massive number of threads by
dumping non-thread group leaders.

Cc: Christoph Lameter <cl@...ux-foundation.org>
Signed-off-by: David Rientjes <rientjes@...gle.com>
---
 mm/oom_kill.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/mm/oom_kill.c b/mm/oom_kill.c
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -297,6 +297,8 @@ static void dump_tasks(const struct mem_cgroup *mem)
 			continue;
 		if (mem && !task_in_mem_cgroup(p, mem))
 			continue;
+		if (!thread_group_leader(p))
+			continue;
 
 		task_lock(p);
 		printk(KERN_INFO "[%5d] %5d %5d %8lu %8lu %3d     %3d %s\n",
--
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