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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 10 Sep 2009 13:32:42 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Rik van Riel <riel@...hat.com>
Cc:	linux-kernel@...r.kernel.org, jens.axboe@...cle.com,
	containers@...ts.linux-foundation.org, dm-devel@...hat.com,
	nauman@...gle.com, dpshah@...gle.com, lizf@...fujitsu.com,
	mikew@...gle.com, fchecconi@...il.com, paolo.valente@...more.it,
	ryov@...inux.co.jp, fernando@....ntt.co.jp, s-uchida@...jp.nec.com,
	taka@...inux.co.jp, guijianfeng@...fujitsu.com, jmoyer@...hat.com,
	dhaval@...ux.vnet.ibm.com, balbir@...ux.vnet.ibm.com,
	righi.andrea@...il.com, m-ikeda@...jp.nec.com, agk@...hat.com,
	akpm@...ux-foundation.org, peterz@...radead.org,
	jmarchan@...hat.com, torvalds@...ux-foundation.org, mingo@...e.hu
Subject: Re: [PATCH 15/23] io-controller: noop changes for hierarchical
	fair queuing

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@...gle.com>
>> Signed-off-by: Vivek Goyal <vgoyal@...hat.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@...hat.com>

Thanks
Vivek

>
> -- 
> All rights reversed.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/