linux-kernel - Re: [PATCH 1 of 13] Add apply_to_page_range() which applies a function to a pte range

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Message-ID: <20060801211410.GH2654@sequoia.sous-sol.org>
Date:	Tue, 1 Aug 2006 14:14:10 -0700
From:	Chris Wright <chrisw@...s-sol.org>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Jeremy Fitzhardinge <jeremy@...source.com>, akpm@...l.org,
	linux-kernel@...r.kernel.org, Chris Wright <chrisw@...s-sol.org>,
	Christian Limpach <Christian.Limpach@...cam.ac.uk>,
	Christoph Lameter <clameter@....com>,
	Gerd Hoffmann <kraxel@...e.de>,
	Hollis Blanchard <hollisb@...ibm.com>,
	Ian Pratt <ian.pratt@...source.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Zachary Amsden <zach@...are.com>
Subject: Re: [PATCH 1 of 13] Add apply_to_page_range() which applies a function to a pte range

* Eric W. Biederman (ebiederm@...ssion.com) wrote:
> - You don't handle huge pages.  For a generic function
>   that sounds like a problem.
> - I believe there is a reason the kernel doesn't already have
>   a function like this.  I seem to recall there being efficiency
>   and fast path arguments.
> - Placing this code in mm/memory.c without a common consumer is
>   pure kernel bloat for everyone who doesn't use this function,
>   which is just about everyone.

We got the opposite feedback the first time we posted this function.
Xen has some users, and I believe there's a couple in-tree functions we could
convert easily w/out overhead issues.  It's generic and this is just the
infrastructure, I think we should leave it.

thanks,
-chris
-
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