linux-kernel - Re: [PATCH v3 02/11] memcg: document cgroup dirty memory interfaces

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Message-Id: <20101020130654.bf861eda.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Wed, 20 Oct 2010 13:06:54 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Greg Thelen <gthelen@...gle.com>
Cc:	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	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>,
	Minchan Kim <minchan.kim@...il.com>,
	Ciju Rajan K <ciju@...ux.vnet.ibm.com>,
	David Rientjes <rientjes@...gle.com>
Subject: Re: [PATCH v3 02/11] memcg: document cgroup dirty memory interfaces

On Tue, 19 Oct 2010 17:45:08 -0700
Greg Thelen <gthelen@...gle.com> wrote:

> KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> writes:
> > BTW, how about supporing dirty_limit_in_bytes when use_hierarchy=0 or
> > leave it as broken when use_hierarchy=1 ?  It seems we can only
> > support dirty_ratio when hierarchy is used.
> 
> I am not sure what you mean here.

When using dirty_ratio, we can check the value of dirty_ratio at setting it
and make guarantee that any children's dirty_ratio cannot exceeds it parent's.

If we guarantee that, we can keep dirty_ratio even under hierarchy.

When it comes to dirty_limit_in_bytes, we never able to do such kind of
controls. So, it will be broken and will do different behavior than
dirty_ratio.

So, not supporing dirty_bytes when use_hierarchy==1 for now sounds reasonable to me.

Thanks,
-Kame





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