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

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Message-Id: <200702212315.12883.ak@suse.de>
Date:	Wed, 21 Feb 2007 23:15:12 +0100
From:	Andi Kleen <ak@...e.de>
To:	virtualization@...ts.osdl.org
Cc:	Jeremy Fitzhardinge <jeremy@...p.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

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.

-Andi
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