linux-kernel - Re: [RFC][PATCH] per-task I/O throttling

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Message-Id: <1200131197.7999.14.camel@lappy>
Date:	Sat, 12 Jan 2008 10:46:37 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Valdis.Kletnieks@...edu
Cc:	righiandr@...rs.sourceforge.net,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Jens Axboe <jens.axboe@...cle.com>
Subject: Re: [RFC][PATCH] per-task I/O throttling


On Fri, 2008-01-11 at 23:57 -0500, Valdis.Kletnieks@...edu wrote:
> On Fri, 11 Jan 2008 17:32:49 +0100, Andrea Righi said:
> 
> > The interesting feature is that it allows to set a priority for each
> > process container, but AFAIK it doesn't allow to "partition" the
> > bandwidth between different containers (that would be a nice feature
> > IMHO). For example it would be great to be able to define per-container
> > limits, like assign 10MB/s for processes in container A, 30MB/s to
> > container B, 20MB/s to container C, etc.
> 
> Has anybody considered allocating based on *seeks* rather than bytes moved,
> or counting seeks as "virtual bytes" for the purposes of accounting (if the
> disk can do 50mbytes/sec, and a seek takes 5millisecs, then count it as 100K
> of data)?

I was considering a time scheduler, you can fill your time slot with
seeks or data, it might be what CFQ does, but I've never even read the
code.

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