From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752610Ab3CAAGK (ORCPT ); Thu, 28 Feb 2013 19:06:10 -0500 Received: from mx1.redhat.com ([209.132.183.28]:6240 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751192Ab3CAAGI (ORCPT ); Thu, 28 Feb 2013 19:06:08 -0500 Date: Thu, 28 Feb 2013 19:05:40 -0500 From: Josh Boyer To: Borislav Petkov , Boris Ostrovsky , hpa@zytor.com, mingo@redhat.com, tglx@linutronix.de, konrad.wilk@oracle.com, rostedt@goodmis.org, gregkh@linuxfoundation.org, samu.kallio@aberdeencloud.com, kraman@redhat.com, xen-devel@lists.xen.org, linux-kernel@vger.kernel.org, stable@kernel.org Subject: Re: [PATCH] mm/x86: Patch out arch_flush_lazy_mmu_mode() when running on bare metal Message-ID: <20130301000539.GA31649@hansolo.jdub.homelinux.org> References: <1362092149-32381-1-git-send-email-boris.ostrovsky@oracle.com> <20130228233720.GB17468@pd.tnic> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20130228233720.GB17468@pd.tnic> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Mar 01, 2013 at 12:37:20AM +0100, Borislav Petkov wrote: > On Thu, Feb 28, 2013 at 05:55:49PM -0500, Boris Ostrovsky wrote: > > Invoking arch_flush_lazy_mmu_mode() results in calls to > > preempt_enable()/disable() which may have performance impact. > > > > Since lazy MMU is not used on bare metal we can patch away > > arch_flush_lazy_mmu_mode() so that it is never called in such > > environment. > > > > Signed-off-by: Boris Ostrovsky > > Looks straight-forward enough to me. > > Acked-by: Borislav Petkov I'll try to get someone to test this tomorrow. josh