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

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Message-ID: <4D020D93.7030808@redhat.com>
Date:	Fri, 10 Dec 2010 12:22:59 +0100
From:	Jerome Marchand <jmarchan@...hat.com>
To:	Vivek Goyal <vgoyal@...hat.com>
CC:	Jens Axboe <jaxboe@...ionio.com>,
	Satoru Takeuchi <takeuchi_satoru@...fujitsu.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] Don't merge different partition's IOs

On 12/08/2010 04:58 PM, Vivek Goyal wrote:
> 
> Storing a pointer to partition in rq also got the advantage that we can
> easily not allow merging of requests across partitions for better
> accounting.

I don't think it really matters (as long as we keep in_flight consistent
of course). The requests that got merged across partition are very likely 
rare enough to be neglectable.

Jerome

> 
> Satoru, so yes, if you can implement what jens is suggesting, would be
> good.
> 
> Thanks
> Vivek

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