linux-kernel - Re: [PATCH v3 04/11] memcg: add lock to synchronize page accounting and migration

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Date:	Tue, 19 Oct 2010 09:45:12 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Greg Thelen <gthelen@...gle.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	containers@...ts.osdl.org, Andrea Righi <arighi@...eler.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Minchan Kim <minchan.kim@...il.com>,
	Ciju Rajan K <ciju@...ux.vnet.ibm.com>,
	David Rientjes <rientjes@...gle.com>
Subject: Re: [PATCH v3 04/11] memcg: add lock to synchronize page accounting
 and migration

On Mon, 18 Oct 2010 17:39:37 -0700
Greg Thelen <gthelen@...gle.com> wrote:

> Performance Impact: moving a 8G anon process.
> 
> Before:
> 	real    0m0.792s
> 	user    0m0.000s
> 	sys     0m0.780s
> 
> After:
> 	real    0m0.854s
> 	user    0m0.000s
> 	sys     0m0.842s
> 
> This score is bad but planned patches for optimization can reduce
> this impact.
> 

I'll post optimization patches after this set goes to -mm.
RFC version will be posted soon.

Thanks,
-Kame

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