linux-kernel - Re: [PATCH 9/9] ext3: do not throttle metadata and journal IO

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Date:	Thu, 23 Apr 2009 14:37:30 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Theodore Tso <tytso@....edu>,
	Andrea Righi <righi.andrea@...il.com>, randy.dunlap@...cle.com,
	Carl Henrik Lunde <chlunde@...g.uio.no>,
	Jens Axboe <jens.axboe@...cle.com>, eric.rannaud@...il.com,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	fernando@....ntt.co.jp, dradford@...ehost.com,
	Gui@...p1.linux-foundation.org, agk@...rceware.org,
	subrata@...ux.vnet.ibm.com, Paul Menage <menage@...gle.com>,
	containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, dave@...ux.vnet.ibm.com,
	matt@...ehost.com, roberto@...it.it, ngupta@...gle.com
Subject: Re: [PATCH 9/9] ext3: do not throttle metadata and journal IO

On Wed, 22 Apr 2009 21:58:25 -0700
Andrew Morton <akpm@...ux-foundation.org> wrote:
> >  Or at least that *someone* is
> > doing so and can perhaps document how all of these knobs interact.
> > After all, if they are going to be separate, and someone turns the I/O
> > throttling knob without bothering to turn the write throttling knob
> > --- what's going to happen?  An OOM?  That's not going to be very safe
> > or friendly for the sysadmin who plans to be configuring the system.
> 
> ... this problem.
> 
Considering that low-io-limit cgroup as very slow device,
the problem itself is not far from that the current kernel has.
If per-bdi-dirty-ratio works well, we can write per-cgroup-dirty-ratio, I think.
(I'll do if I find time.)

But yes, configuration-how-to should be documented, finally.
I hope sysadmins will not use some acrobatic configuration ;)


Thanks,
-Kame

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