Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756562AbaBFRs3 (ORCPT ); Thu, 6 Feb 2014 12:48:29 -0500 Received: from mail-pa0-f44.google.com ([209.85.220.44]:59396 "EHLO mail-pa0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752065AbaBFRs2 (ORCPT ); Thu, 6 Feb 2014 12:48:28 -0500 Message-ID: <52F3CAE3.7060007@gmail.com> Date: Thu, 06 Feb 2014 10:48:19 -0700 From: David Ahern User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:24.0) Gecko/20100101 Thunderbird/24.3.0 MIME-Version: 1.0 To: Stephane Eranian , Arnaldo Carvalho de Melo CC: LKML , Peter Zijlstra , "mingo@elte.hu" , Jiri Olsa , Eric Dumazet Subject: Re: [BUG] perf top: --stdio causes continuous refresh References: <20140206135627.GA26955@infradead.org> <20140206140705.GB26955@infradead.org> <20140206140936.GC26955@infradead.org> In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2/6/14, 8:24 AM, Stephane Eranian wrote: > On Thu, Feb 6, 2014 at 3:09 PM, Arnaldo Carvalho de Melo > wrote: >> Em Thu, Feb 06, 2014 at 12:07:05PM -0200, Arnaldo Carvalho de Melo escreveu: >>> Em Thu, Feb 06, 2014 at 02:58:01PM +0100, Stephane Eranian escreveu: >>>> On Thu, Feb 6, 2014 at 2:56 PM, Arnaldo Carvalho de Melo >>>> wrote: >>>>> Em Wed, Feb 05, 2014 at 10:25:09PM +0100, Stephane Eranian escreveu: >>>>>> If you run perf top on 3.14 but you force --stdio mode, perf top >>>>>> goes crazy and constantly refreshes the output. >>> >>>>>> It does that with many older versions of the perf as well on 3.14. >>>>>> It runs fine with newt mode. >>> >>>>>> Works fine with my 3.11 kernel. So something must be broken >>>>>> with 3.14. >>> >>>>>> Can you reproduce the problem as well? >>> >>>>> Not so far, using my perf/urgent branch: >>> >>>> I am using tip.git. Or try 3.11, 3.10. >> >> But my tests are on top of: >> >> [acme@ssdandy linux]$ uname -r >> 3.11.4-101.fc18.x86_64 >> >> I thought it was a 3.14ish one, building one to try there... >> > The kernel must be 3.14-rcX, the tool can be any version. I don't have time to do a git bisect, but I can narrow the window to 3.13-rc6 and 3.14-rc1. Just happened to update a server yesterday. perf-top --stdio runs fine on the former and shows the problem on the latter. David -- 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/