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[dm-devel] Re: [PATCH 15/23] io-controller: noop changes for hierarchical fair queuing

From: Vivek Goyal <vgoyal redhat com>
To: Rik van Riel <riel redhat com>
Cc: dhaval linux vnet ibm com, peterz infradead org, dm-devel redhat com, dpshah google com, jens axboe oracle com, agk redhat com, balbir linux vnet ibm com, paolo valente unimore it, jmarchan redhat com, guijianfeng cn fujitsu com, fernando oss ntt co jp, mikew google com, jmoyer redhat com, nauman google com, mingo elte hu, m-ikeda ds jp nec com, lizf cn fujitsu com, fchecconi gmail com, s-uchida ap jp nec com, containers lists linux-foundation org, linux-kernel vger kernel org, akpm linux-foundation org, righi andrea gmail com, torvalds linux-foundation org
Subject: [dm-devel] Re: [PATCH 15/23] io-controller: noop changes for hierarchical fair queuing
Date: Thu, 10 Sep 2009 13:32:42 -0400

On Sun, Aug 30, 2009 at 10:52:59PM -0400, Rik van Riel wrote:
> Vivek Goyal wrote:
>> This patch changes noop to use queue scheduling code from elevator layer.
>> One can go back to old noop by deselecting CONFIG_IOSCHED_NOOP_HIER.
>>
>> Signed-off-by: Nauman Rafique <nauman google com>
>> Signed-off-by: Vivek Goyal <vgoyal redhat com>
>
> Not sure why noop needs hierarchical fair queueing
> support, but this patch is so small we might as well
> take it to keep things consistent between schedulers.
>

Thinking more about it. It probably can be useful for the case ryo is
pointing out where fast SSD drivers are not making use of kernel IO
schedulers.

If they want group io schduling support on these SSDs, they can modify their
driver to make use of hierarchical noop.

> Acked-by: Rik van Riel <riel redhat com>

Thanks
Vivek

>
> -- 
> All rights reversed.

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