From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753834Ab3B1Xhc (ORCPT ); Thu, 28 Feb 2013 18:37:32 -0500 Received: from mail.skyhub.de ([78.46.96.112]:47737 "EHLO mail.skyhub.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753554Ab3B1Xha (ORCPT ); Thu, 28 Feb 2013 18:37:30 -0500 Date: Fri, 1 Mar 2013 00:37:20 +0100 From: Borislav Petkov To: Boris Ostrovsky Cc: 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, jwboyer@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: <20130228233720.GB17468@pd.tnic> Mail-Followup-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, jwboyer@redhat.com, xen-devel@lists.xen.org, linux-kernel@vger.kernel.org, stable@kernel.org References: <1362092149-32381-1-git-send-email-boris.ostrovsky@oracle.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <1362092149-32381-1-git-send-email-boris.ostrovsky@oracle.com> 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 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 -- Regards/Gruss, Boris. Sent from a fat crate under my desk. Formatting is fine. --