linux-kernel - Re: [PATCH] compaction: Remove mem_cgroup_del

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Date:	Thu, 9 Dec 2010 23:59:59 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-mm <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Mel Gorman <mel@....ul.ie>,
	Johannes Weiner <hannes@...xchg.org>
Subject: Re: [PATCH] compaction: Remove mem_cgroup_del_lru

On Wed, Dec 08, 2010 at 12:01:26AM +0900, Minchan Kim wrote:
> del_page_from_lru_list alreay called mem_cgroup_del_lru.
> So we need to call it again. It makes wrong stat of memcg and
> even happen VM_BUG_ON hit.
> 
> Cc: Balbir Singh <balbir@...ux.vnet.ibm.com>
> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> Cc: Mel Gorman <mel@....ul.ie>
> Signed-off-by: Minchan Kim <minchan.kim@...il.com>
> ---
>  mm/compaction.c |    1 -
>  1 files changed, 0 insertions(+), 1 deletions(-)
> 
> diff --git a/mm/compaction.c b/mm/compaction.c
> index 50b0a90..b0fbfdf 100644
> --- a/mm/compaction.c
> +++ b/mm/compaction.c
> @@ -302,7 +302,6 @@ static unsigned long isolate_migratepages(struct zone *zone,
>  		/* Successfully isolated */
>  		del_page_from_lru_list(zone, page, page_lru(page));
>  		list_add(&page->lru, migratelist);
> -		mem_cgroup_del_lru(page);
>  		cc->nr_migratepages++;
>  		nr_isolated++;
>  
> -- 
> 1.7.0.4
> 

Hi Andrew, 
Please drop above(mm-compactionc-avoid-double-mem_cgroup_del_lru.patch)
This is a new version with modified description and added Acked-by.

>From 64b3a2c1205d3ffc55878ab8f00f4d450318bb91 Mon Sep 17 00:00:00 2001
From: Minchan Kim <minchan.kim@...il.com>
Date: Thu, 9 Dec 2010 23:49:27 +0900
Subject: [PATCH] mm/compaction.c: avoid double mem_cgroup_del_lru()

del_page_from_lru_list() already called mem_cgroup_del_lru().  So we must
not call it again. It adds unnecessary overhead.

Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Acked-by: Balbir Singh <balbir@...ux.vnet.ibm.com>
Acked-by: Mel Gorman <mel@....ul.ie>
Reviewed-by: Johannes Weiner <hannes@...xchg.org>
Signed-off-by: Minchan Kim <minchan.kim@...il.com>
---
 mm/compaction.c |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)

diff --git a/mm/compaction.c b/mm/compaction.c
index 50b0a90..b0fbfdf 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -302,7 +302,6 @@ static unsigned long isolate_migratepages(struct zone *zone,
 		/* Successfully isolated */
 		del_page_from_lru_list(zone, page, page_lru(page));
 		list_add(&page->lru, migratelist);
-		mem_cgroup_del_lru(page);
 		cc->nr_migratepages++;
 		nr_isolated++;
 
-- 
1.7.0.4


-- 
Kind regards,
Minchan Kim
--
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