linux-kernel - Re: [PATCH 04/09] memcg: make zone_reclaim

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Message-ID: <4932BA80.3060708@redhat.com>
Date:	Sun, 30 Nov 2008 11:08:32 -0500
From:	Rik van Riel <riel@...hat.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
CC:	LKML <linux-kernel@...r.kernel.org>, linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [PATCH 04/09] memcg: make zone_reclaim_stat

KOSAKI Motohiro wrote:

> @@ -172,6 +173,10 @@ void activate_page(struct page *page)
>  
>  		reclaim_stat->recent_rotated[!!file]++;
>  		reclaim_stat->recent_scanned[!!file]++;
> +
> +		memcg_reclaim_stat = mem_cgroup_get_reclaim_stat_by_page(page);
> +		memcg_reclaim_stat->recent_rotated[!!file]++;
> +		memcg_reclaim_stat->recent_scanned[!!file]++;

Also, manipulation of the zone based reclaim_stats happens
under the lru lock.

What protects the memcg reclaim stat?

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