From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752468Ab0HMVJG (ORCPT ); Fri, 13 Aug 2010 17:09:06 -0400 Received: from terminus.zytor.com ([198.137.202.10]:60516 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751599Ab0HMVJC (ORCPT ); Fri, 13 Aug 2010 17:09:02 -0400 Message-ID: <4C65B449.4010905@zytor.com> Date: Fri, 13 Aug 2010 14:08:25 -0700 From: "H. Peter Anvin" User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.7) Gecko/20100720 Fedora/3.1.1-1.fc13 Thunderbird/3.1.1 MIME-Version: 1.0 To: Hugh Dickins CC: Shaohua Li , Andrea Arcangeli , Andrew Morton , lkml , Ingo Molnar , Andi Kleen Subject: Re: [patch]x86: avoid unnecessary tlb flush References: <1281065308.29094.5.camel@sli10-desk.sh.intel.com> <20100805221913.4da0f8be.akpm@linux-foundation.org> <1281660475.21194.1.camel@sli10-desk.sh.intel.com> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 08/13/2010 12:29 PM, Hugh Dickins wrote: > > Just added Andrea to the Cc list: he did that TLB flush in 1a44e149, > I'd feel more comfortable noop-ing it on x86 if you've convinced him. > > Hugh Andrea is probably on his way back from LinuxCon, but looking at the original patch it might be something that non-x86 architectures need, but which can be optimized specifically on x86, since x86 has explicit "no flush needed when going to more permissive" semantics. -hpa