linux-kernel - Re: [kvm-devel] [PATCH] export notifier #1

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Message-ID: <Pine.LNX.4.64.0801241205510.22285@schroedinger.engr.sgi.com>
Date:	Thu, 24 Jan 2008 12:07:52 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	Andrea Arcangeli <andrea@...ranet.com>
cc:	Robin Holt <holt@....com>, Avi Kivity <avi@...ranet.com>,
	Izik Eidus <izike@...ranet.com>, Andrew Morton <akpm@...l.org>,
	Nick Piggin <npiggin@...e.de>, kvm-devel@...ts.sourceforge.net,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	steiner@....com, linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	daniel.blueman@...drics.com, Hugh Dickins <hugh@...itas.com>
Subject: Re: [kvm-devel] [PATCH] export notifier #1

On Thu, 24 Jan 2008, Andrea Arcangeli wrote:

> I think you should consider if you can also build a rmap per-MM like
> KVM does and index it by the virtual address like KVM does.

Yes we have that.

If we have that then we do not need the mmu_notifier. 
We could call it with a page parameter and then walk the KVM or XPmem 
reverse map to directly find all the ptes we need to clear. There is no 
need then to add a new field to the mm_struct.

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