linux-kernel - Re: [patch 5/6] mmu_notifier: Support for drivers with revers maps (f.e. for XPmem)

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Message-ID: <Pine.LNX.4.64.0802271701250.16510@schroedinger.engr.sgi.com>
Date:	Wed, 27 Feb 2008 17:01:50 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	Andrea Arcangeli <andrea@...ranet.com>
cc:	Nick Piggin <nickpiggin@...oo.com.au>, 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>, steiner@....com,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	daniel.blueman@...drics.com
Subject: Re: [patch 5/6] mmu_notifier: Support for drivers with revers maps
 (f.e. for XPmem)

On Thu, 28 Feb 2008, Andrea Arcangeli wrote:

> On Wed, Feb 27, 2008 at 02:43:41PM -0800, Christoph Lameter wrote:
> > Nope. unmap_mapping_range is already handled by the range callbacks.
> 
> But they're called with atomic=1 on anything but anonymous memory. I
> understood Andrew asked to remove the atomic param and to allow
> sleeping for all kind of vmas. I also understood certain XPMEM
> customers asked to use XPMEM on something more than anonymous memory.

Yes but the patch that is discussed here does not handle that situation.
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