From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ian Campbell <ian.campbell@citrix.com>
Subject: Re: [PATCH v3 3/3] tools: introduce parameter
 max_wp_ram_ranges.
Date: Thu, 4 Feb 2016 10:06:25 +0000
Message-ID: <1454580385.25207.148.camel@citrix.com>
References: <1454064314-7799-1-git-send-email-yu.c.zhang@linux.intel.com>
	<1454064314-7799-4-git-send-email-yu.c.zhang@linux.intel.com>
	<56ABA26C02000078000CC7CD@prv-mh.provo.novell.com>
	<56ACCAD5.8030503@linux.intel.com>
	<56AF1CE302000078000CCBBD@prv-mh.provo.novell.com>
	<20160201120244.GT25660@citrix.com>
	<56AF5A6402000078000CCEB2@prv-mh.provo.novell.com>
	<20160201124959.GX25660@citrix.com>
	<56AF669F02000078000CCF8D@prv-mh.provo.novell.com>
	<56AF7657.1000200@linux.intel.com> <56AF85A3.6010803@linux.intel.com>
	<56AF977602000078000CD1BE@prv-mh.provo.novell.com>
	<56AF89BA.4060105@linux.intel.com>
	<22191.36960.564997.621538@mariner.uk.xensource.com>
	<56B093B802000078000CD5FE@prv-mh.provo.novell.com>
	<56B08B51.2030108@linux.intel.com>
	<56B09D2B02000078000CD696@prv-mh.provo.novell.com>
	<56B0B6D0.60303@linux.intel.com>
	<56B0CE8102000078000CD8D4@prv-mh.provo.novell.com>
	<56B0C485.8070206@linux.intel.com>
	<56B0D7A202000078000CD989@prv-mh.provo.novell.com>
	<56B1A7C9.2010708@linux.intel.com>
	<56B1C93002000078000CDD4B@prv-mh.provo.novell.com>
	<6b6d0558d3c24f9483ad41d88ced9837@AMSPEX02CL03.citrite.net>
	<56B2023E02000078000CE01A@prv-mh.provo.novell.com>
	<7316ea5cb41543d69d7727721368e3c8@AMSPEX02CL03.citrite.net>
	<56B207EA02000078000CE0A8@prv-mh.provo.novell.com>
	<9467b97e15bc4cb1b8d6c948ad4fc926@AMSPEX02CL03.citrite.net>
	<56B20BFA02000078000CE0E7@prv-mh.provo.novell.com>
	<621ce95774ac4742b96ed9d504c08670@AMSPEX02CL03.citrite.net>
	<22194.4639.132613.604758@mariner.uk.xensource.com>
	<CAFLBxZad_ZQoXkoXV-HcN+=2m-VAGuX0eAwwQCNpTnRYx-gkdQ@mail.gmail.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
Return-path: <xen-devel-bounces@lists.xen.org>
In-Reply-To: <CAFLBxZad_ZQoXkoXV-HcN+=2m-VAGuX0eAwwQCNpTnRYx-gkdQ@mail.gmail.com>
List-Unsubscribe: <http://lists.xen.org/cgi-bin/mailman/options/xen-devel>,
	<mailto:xen-devel-request@lists.xen.org?subject=unsubscribe>
List-Post: <mailto:xen-devel@lists.xen.org>
List-Help: <mailto:xen-devel-request@lists.xen.org?subject=help>
List-Subscribe: <http://lists.xen.org/cgi-bin/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xen.org?subject=subscribe>
Sender: xen-devel-bounces@lists.xen.org
Errors-To: xen-devel-bounces@lists.xen.org
To: George Dunlap <George.Dunlap@eu.citrix.com>, Ian Jackson <Ian.Jackson@eu.citrix.com>
Cc: Kevin Tian <kevin.tian@intel.com>, Wei Liu <wei.liu2@citrix.com>, Andrew Cooper <Andrew.Cooper3@citrix.com>, "xen-devel@lists.xen.org" <xen-devel@lists.xen.org>, Paul Durrant <Paul.Durrant@citrix.com>, Stefano Stabellini <Stefano.Stabellini@citrix.com>, "zhiyuan.lv@intel.com" <zhiyuan.lv@intel.com>, Jan Beulich <JBeulich@suse.com>, Zhang Yu <yu.c.zhang@linux.intel.com>, "Keir (Xen.org)" <keir@xen.org>
List-Id: xen-devel@lists.xenproject.org

On Wed, 2016-02-03 at 17:41 +0000, George Dunlap wrote:
> But of course, since they they aren't actually ranges but just gpfns,
> they're scattered randomly throughout the guest physical address
> space.

(Possibly) stupid question:

Since, AIUI, the in-guest GPU driver is XenGT aware could it not allocate a
contiguous range of pages at start of day to use as GPU PTs? Or even just N
contiguous regions, e.g. i think the "8K" refers to pages, which is 16 2M
allocations, which is a far more manageable number of ranges to track than
8096 individual pages.

Ian.