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

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Message-Id: <20090417092040.1c832c69.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Fri, 17 Apr 2009 09:20:40 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Andrea Righi <righi.andrea@...il.com>, menage@...gle.com,
	balbir@...ux.vnet.ibm.com, guijianfeng@...fujitsu.com,
	agk@...rceware.org, axboe@...nel.dk, baramsori72@...il.com,
	chlunde@...g.uio.no, dave@...ux.vnet.ibm.com, dpshah@...gle.com,
	eric.rannaud@...il.com, fernando@....ntt.co.jp, taka@...inux.co.jp,
	lizf@...fujitsu.com, matt@...ehost.com, dradford@...ehost.com,
	ngupta@...gle.com, randy.dunlap@...cle.com, roberto@...it.it,
	ryov@...inux.co.jp, s-uchida@...jp.nec.com,
	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 Thu, 16 Apr 2009 15:29:37 -0700
Andrew Morton <akpm@...ux-foundation.org> wrote:

> 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.
> 
Hmm, how about iotrack-cgroup ?

Thanks,
-Kame


> 
> > 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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