From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932386AbXDEAnl (ORCPT ); Wed, 4 Apr 2007 20:43:41 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932433AbXDEAnl (ORCPT ); Wed, 4 Apr 2007 20:43:41 -0400 Received: from gw.goop.org ([64.81.55.164]:36116 "EHLO mail.goop.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932386AbXDEAnk (ORCPT ); Wed, 4 Apr 2007 20:43:40 -0400 Message-ID: <46144621.20407@goop.org> Date: Wed, 04 Apr 2007 17:43:13 -0700 From: Jeremy Fitzhardinge User-Agent: Thunderbird 1.5.0.10 (X11/20070302) MIME-Version: 1.0 To: Christoph Lameter CC: Andi Kleen , Andrew Morton , virtualization@lists.osdl.org, lkml , William Lee Irwin III , Zachary Amsden , Ingo Molnar Subject: Re: [patch 07/20] Allow paravirt backend to choose kernel PMD sharing References: <20070404191151.009821039@goop.org> <20070404191205.392155702@goop.org> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Christoph Lameter wrote: > Acked-by: Christoph Lameter > > for all thats worth since I am not a i386 specialist. > > How much of the issues with page struct sharing between slab and arch code > does this address? > I haven't been following that thread as closely as I should be, so I don't have an answer. I guess the interesting thing in this patch is that it only uses the pmd cache for usermode pmds (which are pre-zeroed), and normal page allocations for kernel pmds. Also, if the kernel pmds are unshared, the pgds are page-sized, so its not really making good use of the pgd cache. J