linux-kernel - Re: [Xen-devel] [RFC 17/23] xen/grant-table: Make it running on 64KB granularity

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Message-ID: <555B566D.8090805@citrix.com>
Date:	Tue, 19 May 2015 16:27:41 +0100
From:	David Vrabel <david.vrabel@...rix.com>
To:	Julien Grall <julien.grall@...rix.com>,
	<xen-devel@...ts.xenproject.org>
CC:	Russell King <linux@....linux.org.uk>, <ian.campbell@...rix.com>,
	<stefano.stabellini@...citrix.com>, <tim@....org>,
	<linux-kernel@...r.kernel.org>,
	David Vrabel <david.vrabel@...rix.com>,
	"Boris Ostrovsky" <boris.ostrovsky@...cle.com>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [Xen-devel] [RFC 17/23] xen/grant-table: Make it running on 64KB
 granularity

On 14/05/15 18:00, Julien Grall wrote:
> The Xen interface is using 4KB page granularity. This means that each
> grant is 4KB.
> 
> The current implementation allocates a Linux page per grant. On Linux
> using 64KB page granularity, only the first 4KB of the page will be
> used.
> 
> We could decrease the memory wasted by sharing the page with multiple
> grant. It will require some care with the {Set,Clear}ForeignPage macro.
> 
> Note that no changes has been made in the x86 code because both Linux
> and Xen will only use 4KB page granularity.

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

David
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