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

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Message-ID: <4CFF3DA4.5060705@jp.fujitsu.com>
Date:	Wed, 08 Dec 2010 17:11:16 +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 17:06), Jens Axboe 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
>
> Yes I know, that is why I said:
>
>>> 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.
>
> That I prefer we fix that code up, since I think it's the best solution
> to the problem.
>

I already postedit.

https://lkml.org/lkml/2010/12/8/12

I think it is OK without mail subject :-)

Thanks,
Satoru

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