linux-kernel - Re: [patch 3/6] mmu_notifier: invalidate

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Message-Id: <200802181251.28813.nickpiggin@yahoo.com.au>
Date:	Mon, 18 Feb 2008 12:51:27 +1100
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Christoph Lameter <clameter@....com>,
	Andrea Arcangeli <andrea@...ranet.com>,
	Robin Holt <holt@....com>, Avi Kivity <avi@...ranet.com>,
	Izik Eidus <izike@...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>, steiner@....com,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	daniel.blueman@...drics.com
Subject: Re: [patch 3/6] mmu_notifier: invalidate_page callbacks

On Saturday 16 February 2008 14:37, Andrew Morton wrote:
> On Thu, 14 Feb 2008 22:49:02 -0800 Christoph Lameter <clameter@....com> 
wrote:
> > Two callbacks to remove individual pages as done in rmap code
> >
> > 	invalidate_page()
> >
> > Called from the inner loop of rmap walks to invalidate pages.
> >
> > 	age_page()
> >
> > Called for the determination of the page referenced status.
> >
> > If we do not care about page referenced status then an age_page callback
> > may be be omitted. PageLock and pte lock are held when either of the
> > functions is called.
>
> The age_page mystery shallows.

BTW. can this callback be called mmu_notifier_clear_flush_young? To
match the core VM.

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