linux-kernel - [PATCH] memcg: clean up soft_limit

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Date:	Mon, 12 Dec 2011 15:09:35 +0100
From:	Michal Hocko <mhocko@...e.cz>
To:	Hillf Danton <dhillf@...il.com>
Cc:	Hugh Dickins <hughd@...gle.com>,
	Balbir Singh <bsingharora@...il.com>,
	David Rientjes <rientjes@...gle.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] memcg: clean up soft_limit_tree properly new

And a follow up patch for the proper clean up:
---
>From 4b9f5a1e88496af9f336d1ef37cfdf3754a3ba48 Mon Sep 17 00:00:00 2001
From: Michal Hocko <mhocko@...e.cz>
Date: Mon, 12 Dec 2011 15:04:18 +0100
Subject: [PATCH] memcg: clean up soft_limit_tree properly

If we are not able to allocate tree nodes for all NUMA nodes then we
should better clean up those that were allocated otherwise we will leak
a memory.

Signed-off-by: Michal Hocko <mhocko@...e.cz>
---
 mm/memcontrol.c |   12 +++++++++++-
 1 files changed, 11 insertions(+), 1 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 6aff93c..838d812 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -4874,7 +4874,7 @@ static int mem_cgroup_soft_limit_tree_init(void)
 			tmp = -1;
 		rtpn = kzalloc_node(sizeof(*rtpn), GFP_KERNEL, tmp);
 		if (!rtpn)
-			return 1;
+			goto err_cleanup;
 
 		soft_limit_tree.rb_tree_per_node[node] = rtpn;
 
@@ -4885,6 +4885,16 @@ static int mem_cgroup_soft_limit_tree_init(void)
 		}
 	}
 	return 0;
+
+err_cleanup:
+	for_each_node_state(node, N_POSSIBLE) {
+		if (!soft_limit_tree.rb_tree_per_node[node])
+			break;
+		kfree(soft_limit_tree.rb_tree_per_node[node]);
+		soft_limit_tree.rb_tree_per_node[node] = NULL;
+	}
+	return 1;
+
 }
 
 static struct cgroup_subsys_state * __ref
-- 
1.7.7.3

-- 
Michal Hocko
SUSE Labs
SUSE LINUX s.r.o.
Lihovarska 1060/12
190 00 Praha 9    
Czech Republic
--
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