From mboxrd@z Thu Jan 1 00:00:00 1970 From: david.vrabel@citrix.com (David Vrabel) Date: Tue, 19 May 2015 16:27:41 +0100 Subject: [Xen-devel] [RFC 17/23] xen/grant-table: Make it running on 64KB granularity In-Reply-To: <1431622863-28575-18-git-send-email-julien.grall@citrix.com> References: <1431622863-28575-1-git-send-email-julien.grall@citrix.com> <1431622863-28575-18-git-send-email-julien.grall@citrix.com> Message-ID: <555B566D.8090805@citrix.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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