linux-kernel - [PATCH 6/9] oom: use same_thread

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Message-Id: <20100616203319.72E6.A69D9226@jp.fujitsu.com>
Date:	Wed, 16 Jun 2010 20:34:02 +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>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	kosaki.motohiro@...fujitsu.com, Oleg Nesterov <oleg@...hat.com>
Subject: [PATCH 6/9] oom: use same_thread_group instead comparing ->mm

Now, oom are using "child->mm != p->mm" check to distinguish subthread.
But It's incorrect. vfork() child also have the same ->mm.

This patch change to use same_thread_group() instead.

Cc: Oleg Nesterov <oleg@...hat.com>
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
---
 mm/oom_kill.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 12204c7..e4b1146 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -161,7 +161,7 @@ unsigned long oom_badness(struct task_struct *p, unsigned long uptime)
 		list_for_each_entry(c, &t->children, sibling) {
 			child = find_lock_task_mm(c);
 			if (child) {
-				if (child->mm != p->mm)
+				if (same_thread_group(p, child))
 					points += child->mm->total_vm/2 + 1;
 				task_unlock(child);
 			}
@@ -486,7 +486,7 @@ static int oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order,
 		list_for_each_entry(child, &t->children, sibling) {
 			unsigned long child_points;
 
-			if (child->mm == p->mm)
+			if (same_thread_group(p, child))
 				continue;
 			if (oom_unkillable_task(child, mem, nodemask))
 				continue;
-- 
1.6.5.2



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