linux-kernel - Re: [Xen-devel] [PATCH 2/3] xen-blkfront: improve aproximation of required grants per request

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Message-ID: <51FA3428.9020403@citrix.com>
Date:	Thu, 1 Aug 2013 11:10:48 +0100
From:	David Vrabel <david.vrabel@...rix.com>
To:	Roger Pau Monne <roger.pau@...rix.com>
CC:	<xen-devel@...ts.xen.org>, <linux-kernel@...r.kernel.org>,
	David Vrabel <david.vrabel@...rix.com>
Subject: Re: [Xen-devel] [PATCH 2/3] xen-blkfront: improve aproximation of
 required grants per request

On 31/07/13 16:00, Roger Pau Monne wrote:
> Improve the calculation of required grants to process a request by
> using nr_phys_segments instead of always assuming a request is going
> to use all posible segments.
> 
> nr_phys_segments contains the number of scatter-gather DMA addr+len
> pairs, which is basically what we put at every granted page.
> for_each_sg iterates over the DMA addr+len pairs and uses a grant
> page for each of them.

Reviewed-by: David Vrabel <david.vrabel@...rix.com>

David
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