linux-kernel - Re: [PATCH 1/3] i/o bandwidth controller documentation

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Message-ID: <ed038eb20806180816w5a4f9d6bt276dec1373758e08@mail.gmail.com>
Date:	Wed, 18 Jun 2008 17:16:56 +0200
From:	"Carl Henrik Lunde" <chlunde@...g.uio.no>
To:	"Andrea Righi" <righi.andrea@...il.com>
Cc:	balbir@...ux.vnet.ibm.com, menage@...gle.com, matt@...ehost.com,
	roberto@...it.it, randy.dunlap@...cle.com,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] i/o bandwidth controller documentation

On Sat, Jun 7, 2008 at 00:27, Andrea Righi <righi.andrea@...il.com> wrote:
[...]
> +3. Advantages of providing this feature
> +
> +* Allow QoS for block device I/O among different cgroups

I'm not sure if this can be called QoS, as it does not guarantee
anything but throttling?

> +* The bandwidth limitations are guaranteed both for synchronous and
> +  asynchronous operations, even the I/O passing through the page cache or
> +  buffers and not only direct I/O (see below for details)

The throttling does not seem to cover the I/O path for XFS?
I was unable to throttle processes reading from an XFS file system.

Also I think the name of the function cgroup_io_account is a bit too innocent?
It sounds like a inline function "{ io += bytes; }", not like
something which may sleep.

-- 
Carl Henrik
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