linux-kernel - Re: [PATCH] mmu notifiers #v8

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Date:	Mon, 3 Mar 2008 11:01:22 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	Nick Piggin <npiggin@...e.de>
cc:	Andrea Arcangeli <andrea@...ranet.com>,
	Jack Steiner <steiner@....com>, akpm@...ux-foundation.org,
	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>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	daniel.blueman@...drics.com
Subject: Re: [PATCH] mmu notifiers #v8

On Mon, 3 Mar 2008, Nick Piggin wrote:

> I'm still not completely happy with this. I had a very quick look
> at the GRU driver, but I don't see why it can't be implemented
> more like the regular TLB model, and have TLB insertions depend on
> the linux pte, and do invalidates _after_ restricting permissions
> to the pte.
> 
> Ie. I'd still like to get rid of invalidate_range_begin, and get
> rid of invalidate calls from places where permissions are relaxed.

Isnt this more a job for paravirt ops if it is so tightly bound to page 
tables? Are we not adding another similar API?

> If we can agree on the API, then I don't see any reason why it can't
> go into 2.6.25, unless someome wants more time to review it (but
> 2.6.25 release should be quite far away still so there should be quite
> a bit of time).

API still has rcu issues and the example given for making things sleepable 
is only working for the aging callback. The most important callback is for 
try_to_unmao and page_mkclean. This means the API is still not generic 
enough and likely not extendable as needed in its present form.




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