linux-kernel - Re: [PATCH V4 00/10] xen: Switch to virtual mapped linear p2m list

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Date:	Mon, 01 Dec 2014 13:54:11 +0100
From:	Juergen Gross <jgross@...e.com>
To:	David Vrabel <david.vrabel@...rix.com>,
	linux-kernel@...r.kernel.org, xen-devel@...ts.xensource.com,
	konrad.wilk@...cle.com, boris.ostrovsky@...cle.com, x86@...nel.org,
	tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
	andrew.cooper3@...rix.com
Subject: Re: [PATCH V4 00/10] xen: Switch to virtual mapped linear p2m list

On 12/01/2014 12:31 PM, David Vrabel wrote:
> On 28/11/14 10:53, Juergen Gross wrote:
>> Paravirtualized kernels running on Xen use a three level tree for
>> translation of guest specific physical addresses to machine global
>> addresses. This p2m tree is used for construction of page table
>> entries, so the p2m tree walk is performance critical.
>>
>> By using a linear virtual mapped p2m list accesses to p2m elements
>> can be sped up while even simplifying code. To achieve this goal
>> some p2m related initializations have to be performed later in the
>> boot process, as the final p2m list can be set up only after basic
>> memory management functions are available.
>
> What are the results of the testing I asked for?

You asked for those replying to the patch introducing the linear
mapping. So I added the description of the tested scenarios in the
patch description of that patch.

> If Konrad or Boris are happy with this series I think it can go into 3.19.

Great, thanks!


Juergen

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