linux-kernel - Re: [dm-devel] [PATCH 0/2] dm-band: The I/O bandwidth controller: Overview

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Message-Id: <20080124.012103.105433865.taka@valinux.co.jp>
Date:	Thu, 24 Jan 2008 01:21:03 +0900 (JST)
From:	Hirokazu Takahashi <taka@...inux.co.jp>
To:	agk@...hat.com
Cc:	ryov@...inux.co.jp, containers@...ts.linux-foundation.org,
	dm-devel@...hat.com, xen-devel@...ts.xensource.com,
	linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org
Subject: Re: [dm-devel] [PATCH 0/2] dm-band: The I/O bandwidth controller:
 Overview

Hi,

> On Wed, Jan 23, 2008 at 09:53:50PM +0900, Ryo Tsuruta wrote:
> > Dm-band gives bandwidth to each job according to its weight, 
> > which each job can set its own value to.
> > At this time, a job is a group of processes with the same pid or pgrp or uid.
> 
> It seems to rely on 'current' to classify bios and doesn't do it until the map
> function is called, possibly in a different process context, so it won't
> always identify the original source of the I/O correctly:

Yes, this should be mentioned in the document with the current implementation
as you pointed out.

By the way, I think once a memory controller of cgroup is introduced, it will
help to track down which cgroup is the original source.

> people need to take
> this into account when designing their group configuration and so this should
> be mentioned in the documentation.
>
> I've uploaded it here while we consider ways we might refine the architecture and
> interfaces etc.:
> 
>   http://www.kernel.org/pub/linux/kernel/people/agk/patches/2.6/editing/dm-add-band-target.patch
> 
> Alasdair
> -- 
> agk@...hat.com

Thank you,
Hirokazu Takahashi.
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