Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755472AbaJUM2J (ORCPT ); Tue, 21 Oct 2014 08:28:09 -0400 Received: from mail-oi0-f43.google.com ([209.85.218.43]:60936 "EHLO mail-oi0-f43.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755191AbaJUM2H (ORCPT ); Tue, 21 Oct 2014 08:28:07 -0400 MIME-Version: 1.0 In-Reply-To: <20141021112501.GY23531@worktop.programming.kicks-ass.net> References: <1412872486-2930-1-git-send-email-eranian@google.com> <20141021112501.GY23531@worktop.programming.kicks-ass.net> Date: Tue, 21 Oct 2014 14:28:06 +0200 Message-ID: Subject: Re: [PATCH v2 0/12] perf/x86: implement HT leak workaround for SNB/IVB/HSW From: Stephane Eranian To: Peter Zijlstra Cc: LKML , "mingo@elte.hu" , "ak@linux.intel.com" , Jiri Olsa , "Liang, Kan" , Borislav Petkov , Maria Dimakopoulou Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Peter, On Tue, Oct 21, 2014 at 1:25 PM, Peter Zijlstra wrote: > > > lkml.kernel.org/r/CABPqkBRbst4sgpgE5O_VXt-CSC0VD=aP2KWA0e3Uy64tw7df3A@mail.gmail.com > > I missed that 3 lines if they were in here. > I did not put them in there because there is another problem. If you partition the generic counters 2 and 2, then some CPUs will not be able to measure some events. Unfortunately, there is no way to partition the 4 counters such that all the events can be measured by each CPU. Some events or precise sampling requires counter 2 for instance (like prec_dist). That's why I did not put this fix in. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/