From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jack Steiner Subject: Re: [patch 2/6] mmu_notifier: Callbacks to invalidate address ranges Date: Tue, 29 Jan 2008 18:28:05 -0600 Message-ID: <20080130002804.GA13840@sgi.com> References: <20080128202840.974253868@sgi.com> <20080128202923.849058104@sgi.com> <20080129162004.GL7233@v2.random> <20080129211759.GV7233@v2.random> <20080129220212.GX7233@v2.random> <20080130000039.GA7233@v2.random> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: Nick Piggin , Andrea Arcangeli , Peter Zijlstra , linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org, Benjamin Herrenschmidt , linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Avi Kivity , kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org, daniel.blueman-xqY44rlHlBpWk0Htik3J/w@public.gmane.org, Robin Holt , Hugh Dickins To: Christoph Lameter Return-path: Content-Disposition: inline In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Errors-To: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: kvm.vger.kernel.org On Tue, Jan 29, 2008 at 04:20:50PM -0800, Christoph Lameter wrote: > On Wed, 30 Jan 2008, Andrea Arcangeli wrote: > > > > invalidate_range after populate allows access to memory for which ptes > > > were zapped and the refcount was released. > > > > The last refcount is released by the invalidate_range itself. > > That is true for your implementation and to address Robin's issues. Jack: > Is that true for the GRU? I'm not sure I understand the question. The GRU never (currently) takes a reference on a page. It has no mechanism for tracking pages that were exported to the external TLBs. --- jack ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/