linux-kernel - Re: [PATCH 2/2] x86: replace BIO_VMERGE_BOUNDARY with BIOVEC_PHYS

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Message-ID: <4905A961.9000603@goop.org>
Date:	Mon, 27 Oct 2008 22:43:29 +1100
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Jens Axboe <jens.axboe@...cle.com>
CC:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	linux-kernel@...r.kernel.org, mingo@...e.hu
Subject: Re: [PATCH 2/2] x86: replace BIO_VMERGE_BOUNDARY with BIOVEC_PHYS_MERGEABLE

Jens Axboe wrote:
> Pretty much baffles me as well, xen should just need to do
>
> #define BIOVEC_PHYS_MERGEABLE(vec1, vec2)       0
>   

It needs to be a runtime switch, since we only want to do this when 
actually running under Xen.  Also, its possible that the two pages might 
actually be physically contiguous, so they could be merged anyway.

    J
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