linux-kernel - [PATCH] memcg: remove the unnecessary MEM_CGROUP_STAT

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Message-Id: <1337933501-3985-1-git-send-email-baozich@gmail.com>
Date:	Fri, 25 May 2012 16:11:41 +0800
From:	Chen Baozi <baozich@...il.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Chen Baozi <baozich@...il.com>
Subject: [PATCH] memcg: remove the unnecessary MEM_CGROUP_STAT_DATA

Since MEM_CGROUP_ON_MOVE has been removed, it comes to be redudant
to hold MEM_CGROUP_STAT_DATA to mark the end of data requires
synchronization.

Signed-off-by: Chen Baozi <baozich@...il.com>
---
 mm/memcontrol.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index f342778..446ca94 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -88,7 +88,6 @@ enum mem_cgroup_stat_index {
 	MEM_CGROUP_STAT_RSS,	   /* # of pages charged as anon rss */
 	MEM_CGROUP_STAT_FILE_MAPPED,  /* # of pages charged as file rss */
 	MEM_CGROUP_STAT_SWAPOUT, /* # of pages, swapped out */
-	MEM_CGROUP_STAT_DATA, /* end of data requires synchronization */
 	MEM_CGROUP_STAT_NSTATS,
 };
 
@@ -2139,7 +2138,7 @@ static void mem_cgroup_drain_pcp_counter(struct mem_cgroup *memcg, int cpu)
 	int i;
 
 	spin_lock(&memcg->pcp_counter_lock);
-	for (i = 0; i < MEM_CGROUP_STAT_DATA; i++) {
+	for (i = 0; i < MEM_CGROUP_STAT_NSTATS; i++) {
 		long x = per_cpu(memcg->stat->count[i], cpu);
 
 		per_cpu(memcg->stat->count[i], cpu) = 0;
-- 
1.7.1

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