linux-kernel - Re: [patch 05/24] Xen-paravirt_ops: Add pagetable accessors to pack and unpack pagetable entries

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Message-ID: <45DCC5C8.4090905@goop.org>
Date:	Wed, 21 Feb 2007 14:20:56 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Andi Kleen <ak@...e.de>
CC:	virtualization@...ts.osdl.org, Chris Wright <chrisw@...s-sol.org>,
	xen-devel@...ts.xensource.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 05/24] Xen-paravirt_ops: Add pagetable accessors to pack
 and unpack pagetable entries

Andi Kleen wrote:
> 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.
>   

I don't.  I think Rusty ran some numbers and found the pte accessors
became the most commonly used paravirt ops.

I'm working on revamping the pv_ops patching infrastructure at the
moment, so we should be able to deal with these fairly efficiently.

    J
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