From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752614Ab1G2RDL (ORCPT ); Fri, 29 Jul 2011 13:03:11 -0400 Received: from casper.infradead.org ([85.118.1.10]:41050 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752458Ab1G2RDK convert rfc822-to-8bit (ORCPT ); Fri, 29 Jul 2011 13:03:10 -0400 Subject: Re: [PATCH 7/7] perf, x86: Implement 64 bit counter support for IBS From: Peter Zijlstra To: Robert Richter Cc: Ingo Molnar , Arnaldo Carvalho de Melo , LKML In-Reply-To: <1311958728.5890.412.camel@twins> References: <1311860812-28748-1-git-send-email-robert.richter@amd.com> <1311860812-28748-8-git-send-email-robert.richter@amd.com> <1311958728.5890.412.camel@twins> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8BIT Date: Fri, 29 Jul 2011 19:02:42 +0200 Message-ID: <1311958962.5890.416.camel@twins> Mime-Version: 1.0 X-Mailer: Evolution 2.30.3 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 2011-07-29 at 18:58 +0200, Peter Zijlstra wrote: > On Thu, 2011-07-28 at 15:46 +0200, Robert Richter wrote: > > This patch implements 64 bit counter support for IBS. The sampling > > period is no longer limited to the hw counter width. > > That should never be the case, even for shorter hw counter, in such a > case you should ignore overflows until you reach the programmed period. Hmm, I might have mis-understood, is that exactly what this patch implements, or does this patch add support for new hardware?