linux-kernel - Re: [PATCH 1/2] Don't merge different partition's IOs

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Message-ID: <4CFF3AD6.6010904@jp.fujitsu.com>
Date:	Wed, 08 Dec 2010 16:59:18 +0900
From:	Satoru Takeuchi <takeuchi_satoru@...fujitsu.com>
To:	Jens Axboe <jaxboe@...ionio.com>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>,
	"vgoyal@...hat.com" <vgoyal@...hat.com>,
	"jmarchan@...hat.com" <jmarchan@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] Don't merge different partition's IOs

Hi Jens,

(2010/12/08 16:33), Jens Axboe wrote:
> On 2010-12-07 15:18, Satoru Takeuchi wrote:

>> I hit on another approach. Although it doesn'tprevent any merge as Linus
>> preferred, it can fix the problem anyway. In this idea, in_flight is
>> incremented and decremented for the partition which the request belonged
>> to in its creation. It has the following merits.

Revert is already finished. 2.6.37-rc-5 and latest stable kernel doesn't
contain Yasuaki's former logic.

https://lkml.org/lkml/2010/10/24/118

>
> I really would prefer if we fixed up the patchset we ended up reverting.
> At least that had a purpose with growing struct request, since we saved
> on doing the partition lookups.
>

Thanks,
Satoru

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