linux-kernel - Re: [RFC][PATCH 0/7] memcg async reclaim

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Date:	Fri, 13 May 2011 12:03:18 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ying Han <yinghan@...gle.com>,
	Johannes Weiner <jweiner@...hat.com>,
	Michal Hocko <mhocko@...e.cz>,
	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>
Subject: Re: [RFC][PATCH 0/7] memcg async reclaim

On Thu, 12 May 2011 17:17:25 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:

> On Thu, 12 May 2011 13:22:37 +0900
> KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:
> I'll check what codes in vmscan.c or /mm affects memcg and post a
> required fix in step by step. I think I found some..
> 

After some tests, I doubt that 'automatic' one is unnecessary until
memcg's dirty_ratio is supported. And as Andrew pointed out,
total cpu consumption is unchanged and I don't have workloads which
shows me meaningful speed up.
But I guess...with dirty_ratio, amount of dirty pages in memcg is
limited and background reclaim can work enough without noise of
write_page() while applications are throttled by dirty_ratio.

Hmm, I'll study for a while but it seems better to start active soft limit,
(or some threshold users can set) first. 

Anyway, this work makes me to see vmscan.c carefully and I think I can
post some patches for fix, tunes.

Thanks,
-Kame

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