linux-kernel - Re: [kvm-devel] [PATCH] mmu notifiers #v7

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Message-ID: <Pine.LNX.4.64.0802271605480.15667@schroedinger.engr.sgi.com>
Date:	Wed, 27 Feb 2008 16:08:07 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	Andrea Arcangeli <andrea@...ranet.com>
cc:	Nick Piggin <npiggin@...e.de>,
	Steve Wise <swise@...ngridcomputing.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>, linux-mm@...ck.org,
	Kanoj Sarcar <kanojsarcar@...oo.com>,
	Roland Dreier <rdreier@...co.com>,
	Jack Steiner <steiner@....com>, linux-kernel@...r.kernel.org,
	Avi Kivity <avi@...ranet.com>, kvm-devel@...ts.sourceforge.net,
	daniel.blueman@...drics.com, Robin Holt <holt@....com>,
	general@...ts.openfabrics.org, akpm@...ux-foundation.org
Subject: Re: [kvm-devel] [PATCH] mmu notifiers #v7

On Thu, 28 Feb 2008, Andrea Arcangeli wrote:

> If RDMA/IB folks needed to block in invalidate_range, I guess they
> need to do so on top of tmpfs too, and that never worked with your
> patch anyway.

How about blocking in invalidate_page()? It can be made to work...

> > Would it not be better to have a solution that fits all instead of hacking 
> > something in now and then having to modify it later?
> 
> The whole point is that your solution fits only GRU and KVM too.

Well so we do not address the issues?
 
> XPMEM in your patch works in a hacked mode limited to anonymous memory
> only, Robin already received incoming mail asking to allow xpmem to
> work on more than anonymous memory, so your solution-that-fits-all
> doesn't actually fit some of Robin's customer needs. So if it doesn't
> even entirely satisfy xpmem users, imagine the other potential
> blocking-users of this code.

The solutions have been mentioned...

> anon_vma lock can remain a spinlock unless you also want to schedule
> inside try_to_unmap.

Either that or a separate rmap as also mentioned before.


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