linux-kernel - [PATCH] [RT] avoid preemption in memory controller code

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Message-Id: <1228746854-23875-1-git-send-email-tim@klingt.org>
Date:	Mon,  8 Dec 2008 15:34:14 +0100
From:	Tim Blechmann <tim@...ngt.org>
To:	rostedt@...dmis.org, linux-rt-users@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Tim Blechmann <tim@...ngt.org>
Subject: [PATCH] [RT] avoid preemption in memory controller code

the lru_lock of struct mem_group_per_zone is used to avoid preemption
during the __mem_cgroup_stat_add_safe function.
therefore, a raw_spinlock_t should be used.

Signed-off-by: Tim Blechmann <tim@...ngt.org>
---
 mm/memcontrol.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 517f945..8661732 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -95,9 +95,9 @@ enum mem_cgroup_zstat_index {
 
 struct mem_cgroup_per_zone {
 	/*
-	 * spin_lock to protect the per cgroup LRU
+	 * raw_spin_lock to protect the per cgroup LRU
 	 */
-	spinlock_t		lru_lock;
+	raw_spinlock_t		lru_lock;
 	struct list_head	active_list;
 	struct list_head	inactive_list;
 	unsigned long count[NR_MEM_CGROUP_ZSTAT];
-- 
1.5.6.3

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