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

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Message-ID: <20080123195839.GK26420@sgi.com>
Date:	Wed, 23 Jan 2008 13:58:39 -0600
From:	Robin Holt <holt@....com>
To:	Christoph Lameter <clameter@....com>
Cc:	Andrea Arcangeli <andrea@...ranet.com>, 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 Wed, Jan 23, 2008 at 11:48:43AM -0800, Christoph Lameter wrote:
> On Wed, 23 Jan 2008, Andrea Arcangeli wrote:
> 
> > On Wed, Jan 23, 2008 at 04:52:47AM -0600, Robin Holt wrote:
> > > But 100 callouts holding spinlocks will not work for our implementation
> > > and even if the callouts are made with spinlocks released, we would very
> > > strongly prefer a single callout which messages the range to the other
> > > side.
> > 
> > But you take the physical address and turn into mm+va with your rmap...
> 
> The remote mm+va or a local mm+va?

To be more complete, the phys is pointing to a xpmem_segment+va and the
xpmem_segment points to the mm.  The seg describes a window into the
source processes virtual address space.  Seems somewhat analogous to the
Xen grant, but I do not know.

Thanks,
Robin
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