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:

quoted

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@redhat.com

Thank you,
Hirokazu Takahashi.