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From: David Vrabel <david.vrabel@citrix.com>
To: xen-devel@lists.xensource.com
CC: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
        linux-kernel@vger.kernel.org,
        "Andrew Morton" <akpm@linux-foundation.org>
Subject: [PATCH 0/6] xen: don't call vmalloc_sync_all() when mapping foreign pages
Date: Thu, 15 Sep 2011 13:40:05 +0100
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This set of pages avoids the need to call vmalloc_sync_all() when
mapping foreign pages.  Two new functions are adding for mapping
foreign pages onto RAM pages instead of vmalloc space.

This does waste a page of RAM for each mapped page.  In the future a
ballooned page could be used instead (once the API for getting a
ballooned page with the right GFP flags is available).

David