From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757789AbZIOBBQ (ORCPT ); Mon, 14 Sep 2009 21:01:16 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757773AbZIOBBM (ORCPT ); Mon, 14 Sep 2009 21:01:12 -0400 Received: from hrndva-omtalb.mail.rr.com ([71.74.56.123]:59444 "EHLO hrndva-omtalb.mail.rr.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757716AbZIOBBL (ORCPT ); Mon, 14 Sep 2009 21:01:11 -0400 Subject: Re: [PATCH RT] Add histograms of potential and effective wakeup latencies From: Steven Rostedt Reply-To: rostedt@goodmis.org To: Carsten Emde Cc: Thomas Gleixner , LKML , RT-Users In-Reply-To: <4AAEDDD5.4040505@osadl.org> References: <4AAEDDD5.4040505@osadl.org> Content-Type: text/plain Organization: Kihon Technologies Inc. Date: Mon, 14 Sep 2009 21:01:12 -0400 Message-Id: <1252976472.20020.64.camel@gandalf.stny.rr.com> Mime-Version: 1.0 X-Mailer: Evolution 2.26.3 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 2009-09-15 at 02:20 +0200, Carsten Emde wrote: > Resuscitated and enhanced the kernel latency histograms provided > originally by Yi Yang and adapted and converted by Steven Rostedt. > > Latency histograms in the current version > - can be enabled online and independently > - have virtually no performance penalty when configured but not enabled > - have very little performance penalty when enabled > - use already available wakeup and switch tracepoints > - give corresponding results with the related tracer > - allow to record wakeup latency histograms of a single process > - record the process where the highest wakeup latency occurred > - are documented in Documentation/trace/histograms.txt > > Signed-off-by: Carsten Emde I did a quick scan of the patch and this looks much nicer. Good work! Acked-by: Steven Rostedt -- Steve