From: Jeremy Fitzhardinge <jeremy@goop.org>
To: Rusty Russell <rusty@rustcorp.com.au>
Cc: Andi Kleen <ak@suse.de>, Chris Wright <chrisw@sous-sol.org>,
virtualization@lists.osdl.org,
Andrew Morton <akpm@linux-foundation.org>,
xen-devel@lists.xensource.com, linux-kernel@vger.kernel.org
Subject: Re: [Xen-devel] Re: [patch 05/24] Xen-paravirt_ops: Add pagetable accessors to pack and unpack pagetable entries
Date: Wed, 21 Feb 2007 15:27:21 -0800 [thread overview]
Message-ID: <45DCD559.1040301@goop.org> (raw)
In-Reply-To: <1172100002.13378.42.camel@localhost.localdomain>
Rusty Russell wrote:
> On Wed, 2007-02-21 at 23:15 +0100, Andi Kleen wrote:
>
>> On Wednesday 21 February 2007 21:52, Jeremy Fitzhardinge wrote:
>>
>>> Add a set of accessors to pack, unpack and modify page table entries
>>> (at all levels). This allows a paravirt implementation to control the
>>> contents of pgd/pmd/pte entries. For example, Xen uses this to
>>> convert the (pseudo-)physical address into a machine address when
>>> populating a pagetable entry, and converting back to pphys address
>>> when an entry is read.
>>>
>> Do you have some lmbench numbers before/after this change?
>> iirc at least fork and exit do a lot of pte accesses in various forms.
>> If it's measurable it might be needed to patch those for the native case.
>>
>
> Yes, __mkpte must be patched to avoid performance embarrassment.
>
> Jeremy, did you want me to do this, or are you happy to?
>
I'm working on it now. I'll mail out a proposal in a little bit.
J
next prev parent reply other threads:[~2007-02-21 23:27 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20070221205254.169835700@goop.org>
[not found] ` <20070221205323.770169136@goop.org>
2007-02-21 22:10 ` [patch 17/24] Xen-paravirt_ops: avoid having a bad selector in %gs during context switch Andi Kleen
2007-02-21 22:14 ` Jeremy Fitzhardinge
2007-02-21 22:16 ` Keir Fraser
2007-02-21 23:25 ` [Xen-devel] " Zachary Amsden
2007-02-21 23:29 ` Jeremy Fitzhardinge
[not found] ` <20070221205322.869165491@goop.org>
2007-02-21 22:15 ` [patch 05/24] Xen-paravirt_ops: Add pagetable accessors to pack and unpack pagetable entries Andi Kleen
2007-02-21 22:20 ` Jeremy Fitzhardinge
2007-02-21 23:20 ` Rusty Russell
2007-02-21 23:27 ` Jeremy Fitzhardinge [this message]
[not found] ` <20070221205323.842917348@goop.org>
2007-02-22 3:10 ` [patch 18/24] Xen-paravirt_ops: Some generic early printk & boot console fixups Andrew Morton
2007-02-22 5:48 ` Jeremy Fitzhardinge
2007-02-22 8:33 ` Gerd Hoffmann
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