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

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Date:	Thu, 12 May 2011 17:17:25 +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 13:22:37 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:

> On Wed, 11 May 2011 20:51:10 -0700
> Andrew Morton <akpm@...ux-foundation.org> wrote:

> Ah, sorry. above was on KVM.  without container.
> ==
> [root@...l6-test hilow]# time cp ./tmpfile xxx
> 
> real    0m5.197s
> user    0m0.006s
> sys     0m2.599s
> ==
> Hmm, still slow. I'll use real hardware in the next post.
> 

I'm now testing on a real machine with some fixes and see

== without async reclaim ==
real    0m6.569s
user    0m0.006s
sys     0m0.976s

== with async reclaim ==
real    0m6.305s
user    0m0.007s
sys     0m0.907s

...in gneral sys time reduced always but 'real' is in error range ;)
yes, no gain.

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..

Thanks,
-Kame

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