From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andrea Arcangeli <andrea@qumranet.com>
Subject: [ofa-general] Re: [PATCH 04 of 12] Moves all mmu notifier methods
	outside the PT lock (first and not last
Date: Wed, 23 Apr 2008 20:16:51 +0200
Message-ID: <20080423181651.GH24536@duo.random>
References: <ac9bb1fb3de2aa5d2721.1208872280@duo.random>
	<Pine.LNX.4.64.0804221323510.3640@schroedinger.engr.sgi.com>
	<20080422224048.GR24536@duo.random>
	<Pine.LNX.4.64.0804221613570.4868@schroedinger.engr.sgi.com>
	<20080423134427.GW24536@duo.random>
	<Pine.LNX.4.64.0804231059300.12373@schroedinger.engr.sgi.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Cc: Nick Piggin <npiggin@suse.de>, Rusty Russell <rusty@rustcorp.com.au>,
	Peter Zijlstra <a.p.zijlstra@chello.nl>, kvm-devel@lists.sourceforge.net,
	Kanoj Sarcar <kanojsarcar@yahoo.com>, Roland Dreier <rdreier@cisco.com>,
	Jack Steiner <steiner@sgi.com>, linux-kernel@vger.kernel.org,
	Avi Kivity <avi@qumranet.com>, linux-mm@kvack.org,
	Robin Holt <holt@sgi.com>, general@lists.openfabrics.org,
	Hugh Dickins <hugh@veritas.com>, akpm@linux-foundation.org
To: Christoph Lameter <clameter@sgi.com>
Return-path: <general-bounces@lists.openfabrics.org>
Content-Disposition: inline
In-Reply-To: <Pine.LNX.4.64.0804231059300.12373@schroedinger.engr.sgi.com>
List-Unsubscribe: <http://lists.openfabrics.org/cgi-bin/mailman/listinfo/general>,
	<mailto:general-request@lists.openfabrics.org?subject=unsubscribe>
List-Archive: <http://lists.openfabrics.org/pipermail/general>
List-Post: <mailto:general@lists.openfabrics.org>
List-Help: <mailto:general-request@lists.openfabrics.org?subject=help>
List-Subscribe: <http://lists.openfabrics.org/cgi-bin/mailman/listinfo/general>,
	<mailto:general-request@lists.openfabrics.org?subject=subscribe>
Sender: general-bounces@lists.openfabrics.org
Errors-To: general-bounces@lists.openfabrics.org
List-Id: kvm.vger.kernel.org

On Wed, Apr 23, 2008 at 11:02:18AM -0700, Christoph Lameter wrote:
> We have had this workaround effort done years ago and have been 
> suffering the ill effects of pinning for years. Had to deal with 

Yes. In addition to the pinning, there's lot of additional tlb
flushing work to do in kvm without mmu notifiers as the swapcache
could be freed by the vm the instruction after put_page unpins the
page for whatever reason.