linux-kernel - Re: [PATCH v6 0/9] memcg: per cgroup dirty page accounting

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Message-Id: <20110315115451.7a7d3605.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Tue, 15 Mar 2011 11:54:51 +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, linux-fsdevel@...r.kernel.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>,
	Johannes Weiner <hannes@...xchg.org>,
	Ciju Rajan K <ciju@...ux.vnet.ibm.com>,
	David Rientjes <rientjes@...gle.com>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Chad Talbott <ctalbott@...gle.com>,
	Justin TerAvest <teravest@...gle.com>,
	Vivek Goyal <vgoyal@...hat.com>
Subject: Re: [PATCH v6 0/9] memcg: per cgroup dirty page accounting

On Mon, 14 Mar 2011 19:51:22 -0700
Greg Thelen <gthelen@...gle.com> wrote:

> On Mon, Mar 14, 2011 at 6:56 PM, KAMEZAWA Hiroyuki
> <kamezawa.hiroyu@...fujitsu.com> wrote:
> > On Mon, 14 Mar 2011 11:29:17 -0700
> > Greg Thelen <gthelen@...gle.com> wrote:
> >
> >> On Fri, Mar 11, 2011 at 5:10 PM, Andrew Morton
> The foreign dirtier issue is all about identifying the memcg (or
> possibly multiple bdi) that need balancing.    If the foreign dirtier
> issue is not important then we can focus on identifying inodes to
> writeback that will lower the current's memcg dirty usage.  I am fine
> ignoring the foreign dirtier issue for now and breaking the problem
> into smaller pieces.
> 
ok.

> I think this can be done with out any additional state.  Can just scan
> the memcg lru to find dirty file pages and thus inodes to pass to
> sync_inode(), or some other per-inode writeback routine?
> 

I think it works, finding inodes to be cleaned by LRU scanning.

Thanks,
-Kame

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