Re: [Xen-devel] [PATCH 2/3] xen-blkfront: improve aproximation ofrequired grants per request

From: David Vrabel
Date: Thu Aug 01 2013 - 06:10:54 EST

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@xxxxxxxxxx>

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