linux-kernel - Re: [RFC] [PATCH -mm 0/2] memcg: per cgroup dirty

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Message-Id: <20080924143217.9B2E.KOSAKI.MOTOHIRO@jp.fujitsu.com>
Date:	Wed, 24 Sep 2008 15:59:01 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	"Michael Rubin" <mrubin@...gle.com>
Cc:	kosaki.motohiro@...fujitsu.com,
	"Andrew Morton" <akpm@...ux-foundation.org>, dradford@...ehost.com,
	m.innocenti@...eca.it, fernando@....ntt.co.jp,
	containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, chlunde@...g.uio.no,
	dave@...ux.vnet.ibm.com, dpshah@...gle.com, agk@...rceware.org,
	matt@...ehost.com, menage@...gle.com,
	"Andrea Righi" <righi.andrea@...il.com>, eric.rannaud@...il.com,
	balbir@...ux.vnet.ibm.com
Subject: Re: [RFC] [PATCH -mm 0/2] memcg: per cgroup dirty_ratio

> > We don't have any motivation of its interface change.
> 
> We are seeing problems where we are generating a lot of dirty memory
> from asynchronous background writes while more important traffic is
> operating with DIRECT_IO. The DIRECT_IO traffic will incur high
> latency spikes as the pdflush hits the background threshold and tries
> to write a lot of dirty buffers at once.
> 
> What we want to do is lower the background threshold low enough so
> that we don't end up writing a lot of data at one time. As systems get
> more and more memory this is and will become difficult. 1% of system
> RAM could tie up a disk.

yup.
sorry, I choosed bad word at my last mail. it caused your confusion.
I only disagreed vm_dirty_KB.

I agreed with fine graind vm_dirty_ratio.

Thanks.


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