From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755229AbZHNCBf (ORCPT ); Thu, 13 Aug 2009 22:01:35 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754796AbZHNCBe (ORCPT ); Thu, 13 Aug 2009 22:01:34 -0400 Received: from e28smtp01.in.ibm.com ([59.145.155.1]:41336 "EHLO e28smtp01.in.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752721AbZHNCBd (ORCPT ); Thu, 13 Aug 2009 22:01:33 -0400 Date: Fri, 14 Aug 2009 07:31:23 +0530 From: Balbir Singh To: Ingo Molnar Cc: Daisuke Nishimura , Andrew Morton , "lizf@cn.fujitsu.com" , KAMEZAWA Hiroyuki , "menage@google.com" , xemul@openvz.org, prarit@redhat.com, andi.kleen@intel.com, "linux-kernel@vger.kernel.org" , "linux-mm@kvack.org" Subject: Re: [UPDATED][PATCH][mmotm] Help Root Memory Cgroup Resource Counters Scale Better (v5) Message-ID: <20090814020122.GL5087@balbir.in.ibm.com> Reply-To: balbir@linux.vnet.ibm.com References: <20090813065504.GG5087@balbir.in.ibm.com> <20090813162640.fe2349e9.nishimura@mxp.nes.nec.co.jp> <20090813080206.GH5087@balbir.in.ibm.com> <20090813083524.GC21389@elte.hu> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline In-Reply-To: <20090813083524.GC21389@elte.hu> User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Ingo Molnar [2009-08-13 10:35:24]: > > * Balbir Singh wrote: > > > Without Patch > > > > Performance counter stats for '/home/balbir/parallel_pagefault': > > > > 5826093739340 cycles # 809.989 M/sec > > 408883496292 instructions # 0.070 IPC > > 7057079452 cache-references # 0.981 M/sec > > 3036086243 cache-misses # 0.422 M/sec > > > With this patch applied > > > > Performance counter stats for '/home/balbir/parallel_pagefault': > > > > 5957054385619 cycles # 828.333 M/sec > > 1058117350365 instructions # 0.178 IPC > > 9161776218 cache-references # 1.274 M/sec > > 1920494280 cache-misses # 0.267 M/sec > > Nice how the instruction count and the IPC value incraesed, and the > cache-miss count decreased. > > Btw., a 'perf stat' suggestion: you can also make use of built-in > error bars via repeating parallel_pagefault N times: > > aldebaran:~> perf stat --repeat 3 /bin/ls Ingo, with the repeat experiements I see 7192354.545647 task-clock-msecs # 23.955 CPUs ( +- 0.002% ) 425627 context-switches # 0.000 M/sec ( +- 0.333% ) 155 CPU-migrations # 0.000 M/sec ( +- 10.897% ) 95336481 page-faults # 0.013 M/sec ( +- 0.085% ) 5951929070187 cycles # 827.536 M/sec ( +- 0.009% ) 1058312583796 instructions # 0.178 IPC ( +- 0.076% ) 9616609083 cache-references # 1.337 M/sec ( +- 2.536% ) 1952367514 cache-misses # 0.271 M/sec ( +- 0.156% ) 300.246532761 seconds time elapsed ( +- 0.002% ) Except for the CPU migrations and the cache references, all the other parameters seem to be well within an acceptable error range. -- Balbir