linux-kernel - Re: [PATCH 3/9] bio-cgroup controller

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Message-Id: <20090416152937.b2188370.akpm@linux-foundation.org>
Date:	Thu, 16 Apr 2009 15:29:37 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Andrea Righi <righi.andrea@...il.com>
Cc:	menage@...gle.com, balbir@...ux.vnet.ibm.com,
	guijianfeng@...fujitsu.com, kamezawa.hiroyu@...fujitsu.com,
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	eric.rannaud@...il.com, fernando@....ntt.co.jp, taka@...inux.co.jp,
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	ngupta@...gle.com, randy.dunlap@...cle.com, roberto@...it.it,
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	subrata@...ux.vnet.ibm.com, yoshikawa.takuya@....ntt.co.jp,
	containers@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/9] bio-cgroup controller

On Tue, 14 Apr 2009 22:21:14 +0200
Andrea Righi <righi.andrea@...il.com> wrote:

> Subject: [PATCH 3/9] bio-cgroup controller

Sorry, but I have to register extreme distress at the name of this. 
The term "bio" is well-established in the kernel and here we have a new
definition for the same term: "block I/O".

"bio" was a fine term for you to have chosen from the user's
perspective, but from the kernel developer perspective it is quite
horrid.  The patch adds a vast number of new symbols all into the
existing "bio_" namespace, many of which aren't related to `struct bio'
at all.

At least, I think that's what's happening.  Perhaps the controller
really _is_ designed to track `struct bio'?  If so, that's an odd thing
to tell userspace about.

> The controller bio-cgroup is used by io-throttle to track writeback IO
> and for properly apply throttling.

Presumably it tracks all forms of block-based I/O and not just delayed
writeback.

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