linux-kernel - Re: [RFC][PATCH 0/9] memcg soft limit v2 (new design)

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Date:	Fri, 24 Apr 2009 17:54:41 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kosaki.motohiro@...fujitsu.com" <kosaki.motohiro@...fujitsu.com>
Subject: Re: [RFC][PATCH 0/9] memcg soft limit v2 (new design)

* KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> [2009-04-03 17:08:35]:

> Hi,
> 
> Memory cgroup's soft limit feature is a feature to tell global LRU 
> "please reclaim from this memcg at memory shortage".
> 
> This is v2. Fixed some troubles under hierarchy. and increase soft limit
> update hooks to proper places.
> 
> This patch is on to
>   mmotom-Mar23 + memcg-cleanup-cache_charge.patch
>   + vmscan-fix-it-to-take-care-of-nodemask.patch
> 
> So, not for wide use ;)
> 
> This patch tries to avoid to use existing memcg's reclaim routine and
> just tell "Hints" to global LRU. This patch is briefly tested and shows
> good result to me. (But may not to you. plz brame me.)
> 
> Major characteristic is.
>  - memcg will be inserted to softlimit-queue at charge() if usage excess
>    soft limit.
>  - softlimit-queue is a queue with priority. priority is detemined by size
>    of excessing usage.
>  - memcg's soft limit hooks is called by shrink_xxx_list() to show hints.
>  - Behavior is affected by vm.swappiness and LRU scan rate is determined by
>    global LRU's status.
> 
> In this v2.
>  - problems under use_hierarchy=1 case are fixed.
>  - more hooks are added.
>  - codes are cleaned up.
>

The results seem good so far with some basic tests I've been doing.
I'll come back with more feedback, I would like to see this feature in
-mm soon.

-- 
	Balbir
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