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Date: Fri, 22 Apr 2011 13:43:10 +0900
From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Subject: Re: [PATCH V7 8/9] Add per-memcg zone "unreclaimable"
Message-Id: <20110422134310.154b86a2.kamezawa.hiroyu@jp.fujitsu.com>
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	<1303446260-21333-9-git-send-email-yinghan@google.com>
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To: Ying Han <yinghan@google.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>, Minchan Kim <minchan.kim@gmail.com>, Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>, Balbir Singh <balbir@linux.vnet.ibm.com>, Tejun Heo <tj@kernel.org>, Pavel Emelyanov <xemul@openvz.org>, Andrew Morton <akpm@linux-foundation.org>, Li Zefan <lizf@cn.fujitsu.com>, Mel Gorman <mel@csn.ul.ie>, Christoph Lameter <cl@linux.com>, Johannes Weiner <hannes@cmpxchg.org>, Rik van Riel <riel@redhat.com>, Hugh Dickins <hughd@google.com>, Michal Hocko <mhocko@suse.cz>, Dave Hansen <dave@linux.vnet.ibm.com>, Zhu Yanhai <zhu.yanhai@gmail.com>, linux-mm@kvack.org

On Thu, 21 Apr 2011 21:24:19 -0700
Ying Han <yinghan@google.com> wrote:

> After reclaiming each node per memcg, it checks mem_cgroup_watermark_ok()
> and breaks the priority loop if it returns true. The per-memcg zone will
> be marked as "unreclaimable" if the scanning rate is much greater than the
> reclaiming rate on the per-memcg LRU. The bit is cleared when there is a
> page charged to the memcg being freed. Kswapd breaks the priority loop if
> all the zones are marked as "unreclaimable".
> 
> changelog v7..v6:
> 1. fix merge conflicts w/ the thread-pool patch.
> 
> changelog v6..v5:
> 1. make global zone_unreclaimable use the ZONE_MEMCG_RECLAIMABLE_RATE.
> 2. add comment on the zone_unreclaimable
> 
> changelog v5..v4:
> 1. reduce the frequency of updating mz->unreclaimable bit by using the existing
> memcg batch in task struct.
> 2. add new function mem_cgroup_mz_clear_unreclaimable() for recoganizing zone.
> 
> changelog v4..v3:
> 1. split off from the per-memcg background reclaim patch in V3.
> 
> Signed-off-by: Ying Han <yinghan@google.com>

Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>

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