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

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Message-Id: <20080124.191456.119427875.taka@valinux.co.jp>
Date:	Thu, 24 Jan 2008 19:14:56 +0900 (JST)
From:	Hirokazu Takahashi <taka@...inux.co.jp>
To:	yamamoto@...inux.co.jp
Cc:	agk@...hat.com, xen-devel@...ts.xensource.com,
	containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org, dm-devel@...hat.com
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.
> 
> do you mean to make this a part of the memory subsystem?

I just think if the memory subsystem is in front of us, we don't need to
reinvent the wheel.

But I don't have a concrete image how the interface between dm-band and
the memory subsystem should be designed yet. I'd be appreciate if some of
the cgroup developers give some ideas about it.

Thanks,
Hirokazu Takahashi.


> YAMAMOTO Takashi

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