linux-kernel - Re: [RFC] Notifier for Externally Mapped Memory (EMM)

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Message-ID: <Pine.LNX.4.64.0803041059110.13957@schroedinger.engr.sgi.com>
Date:	Tue, 4 Mar 2008 11:00:31 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	Andrea Arcangeli <andrea@...ranet.com>
cc:	Jack Steiner <steiner@....com>, Nick Piggin <npiggin@...e.de>,
	akpm@...ux-foundation.org, Robin Holt <holt@....com>,
	Avi Kivity <avi@...ranet.com>, kvm-devel@...ts.sourceforge.net,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	general@...ts.openfabrics.org,
	Steve Wise <swise@...ngridcomputing.com>,
	Roland Dreier <rdreier@...co.com>,
	Kanoj Sarcar <kanojsarcar@...oo.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	daniel.blueman@...drics.com
Subject: Re: [RFC] Notifier for Externally Mapped Memory (EMM)

On Tue, 4 Mar 2008, Andrea Arcangeli wrote:

> When working with single pages it's more efficient and preferable to
> call invalidate_page and only later release the VM reference on the
> page.

But as you pointed out before that path is a slow path anyways. Its rarely 
taken. Having a single eviction callback simplifies design.

Plus the device driver can still check if the mapping was of PAGE_SIZE and 
then implement its own optimization.
 
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