linux-kernel - Re: [patch 15/26] Xen-paravirt_ops: Add apply_to_page_range() which applies a function to a pte range.

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Message-ID: <20070316091940.GJ23174@elte.hu>
Date:	Fri, 16 Mar 2007 10:19:40 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Andi Kleen <ak@....de>, Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, virtualization@...ts.osdl.org,
	xen-devel@...ts.xensource.com, Chris Wright <chrisw@...s-sol.org>,
	Zachary Amsden <zach@...are.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Ian Pratt <ian.pratt@...source.com>,
	Christian Limpach <Christian.Limpach@...cam.ac.uk>,
	Christoph Lameter <clameter@....com>
Subject: Re: [patch 15/26] Xen-paravirt_ops: Add apply_to_page_range() which applies a function to a pte range.


* Jeremy Fitzhardinge <jeremy@...p.org> wrote:

> Add a new mm function apply_to_page_range() which applies a given 
> function to every pte in a given virtual address range in a given mm 
> structure. This is a generic alternative to cut-and-pasting the Linux 
> idiomatic pagetable walking code in every place that a sequence of 
> PTEs must be accessed.

nice one! I suspect we could simplify some of the less 
performance-critical open-coded pagetable walker loops in the kernel 
with this? (i'm not even sure it's all that much of a performance loss 
to pass a function pointer around - would be nice to convert say 
mprotect() to this and see the performance difference?)

Acked-by: Ingo Molnar <mingo@...e.hu>

	Ingo
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