From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932488Ab1IMT6k (ORCPT ); Tue, 13 Sep 2011 15:58:40 -0400 Received: from one.firstfloor.org ([213.235.205.2]:53558 "EHLO one.firstfloor.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932218Ab1IMT6j (ORCPT ); Tue, 13 Sep 2011 15:58:39 -0400 Date: Tue, 13 Sep 2011 21:58:38 +0200 From: Andi Kleen To: Don Zickus Cc: Andi Kleen , Avi Kivity , Jeremy Fitzhardinge , Peter Zijlstra , "H. Peter Anvin" , Linus Torvalds , Ingo Molnar , the arch/x86 maintainers , Linux Kernel Mailing List , Nick Piggin , Marcelo Tosatti , KVM , Xen Devel , Jeremy Fitzhardinge , Stefano Stabellini Subject: Re: [PATCH 08/13] xen/pvticketlock: disable interrupts while blocking Message-ID: <20110913195838.GS7761@one.firstfloor.org> References: <4E66EF86.9070200@redhat.com> <20110907134411.GV5795@redhat.com> <4E678992.5050709@redhat.com> <20110907155657.GX5795@redhat.com> <4E679AF4.50209@redhat.com> <20110907165203.GQ6838@redhat.com> <4E67A551.4000502@redhat.com> <20110913184044.GN5795@redhat.com> <20110913190320.GR7761@one.firstfloor.org> <20110913192152.GO5795@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20110913192152.GO5795@redhat.com> User-Agent: Mutt/1.4.2.2i Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > Or are you saying an NMI in an idle system will have the same %rip thus > falsely detecting a back-to-back NMI? Yup. Another problem is very long running instructions, like WBINVD and some others. If there's a high frequency NMI it may well hit multiple times in a single instance. -Andi -- ak@linux.intel.com -- Speaking for myself only.