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

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Message-Id: <20090422215825.f83e1b27.akpm@linux-foundation.org>
Date:	Wed, 22 Apr 2009 21:58:25 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Theodore Tso <tytso@....edu>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	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 Thu, 23 Apr 2009 00:35:48 -0400 Theodore Tso <tytso@....edu> wrote:

> I hope someone like akpm is paying very close attention and auditing
> these patches both from an low-level patch cleanliness point of view
> as well as a high-level design review.

Not yet, really.  But I intend to.  Largely because I've always been
very skeptical that anyone has found a good solution to...

>  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.
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