Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757292AbaFSGE0 (ORCPT ); Thu, 19 Jun 2014 02:04:26 -0400 Received: from mail7.hitachi.co.jp ([133.145.228.42]:36277 "EHLO mail7.hitachi.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751674AbaFSGEZ (ORCPT ); Thu, 19 Jun 2014 02:04:25 -0400 X-AuditID: 85900ec0-d452db9000001514-89-53a27d65b383 Message-ID: <53A27D66.6070409@hitachi.com> Date: Thu, 19 Jun 2014 15:04:22 +0900 From: Yoshihiro YUNOMAE User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:13.0) Gecko/20120604 Thunderbird/13.0 MIME-Version: 1.0 To: Jet Chen Cc: Fengguang Wu , LKML , lkp@01.org, Steven Rostedt Subject: Re: [tracing] 939c7a4f04f: -46.4% cpuidle.C3-IVT.time References: <53A10460.1040705@intel.com> In-Reply-To: <53A10460.1040705@intel.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Brightmail-Tracker: AAAAAA== Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Jet, Thank you for your report. I have some questions for your test. 1. Did you enable ftrace? This patch added a feature for ftrace. If you disabled ftrace in this test, my patch will not affect the system. Moreover, in my patch, arrays for saved_cmdlines were just changed from using static global variables to using kmalloc() on default setting. So, even if you enabled ftrace, this patch will not induce a big problem, I think. 2. How did you test it and what does the result mean? Please tell me the workload, how to calculate the score, system settings, etc... Thanks, Yoshihiro YUNOMAE (2014/06/18 12:15), Jet Chen wrote: > Hi Yoshihiro, > > FYI, we noticed the below changes on > > commit 939c7a4f04fcd2162109744e8bf88194948a6e65 ("tracing: Introduce > saved_cmdlines_size file") > > test case: brickland3/aim7/3000-brk_test > > beba4bb096201ce 939c7a4f04fcd2162109744e8 > --------------- ------------------------- > 352643 ~40% -46.4% 189136 ~15% TOTAL cpuidle.C3-IVT.time > 750 ~ 2% -13.3% 650 ~ 2% TOTAL vmstat.procs.b > 362016 ~ 3% -6.0% 340296 ~ 3% TOTAL > proc-vmstat.pgmigrate_success > 362016 ~ 3% -6.0% 340296 ~ 3% TOTAL > proc-vmstat.numa_pages_migrated > 1642328 ~ 3% +13.3% 1860721 ~ 2% TOTAL softirqs.RCU > 2278829 ~ 2% -14.0% 1959647 ~ 2% TOTAL > time.voluntary_context_switches > 207 ~ 0% -10.4% 185 ~ 0% TOTAL time.user_time > ~ 0% +8.5% ~ 0% TOTAL turbostat.RAM_W > 4418246 ~ 3% -6.4% 4136447 ~ 1% TOTAL time.minor_page_faults > ~ 0% +3.4% ~ 0% TOTAL turbostat.Cor_W > ~ 0% +3.0% ~ 0% TOTAL turbostat.Pkg_W > 11354889 ~ 0% +2.0% 11579897 ~ 0% TOTAL > time.involuntary_context_switches > > Legend: > ~XX% - stddev percent > [+-]XX% - change percent > > > time.voluntary_context_switches > > 2.4e+06 > ++---------------------------------------------------*------------+ > *.. *.. .. > .. | > 2.3e+06 ++ .*.. *.. .. > * | > | *..*. . .*.. .. * *.. + > *.. *..* > | *. * . .*..*.. + > .. | > 2.2e+06 ++ *..*. * > * | > > | | > 2.1e+06 > ++ | > > | | > 2e+06 O+ O O > O | > | O O O > O | > | O O O O > O | > 1.9e+06 ++ O O O > O | > | O O > O | > 1.8e+06 > ++----------------------------------------------------------------+ > > > turbostat.Pkg_W > > ++--------------------------------------------------------------------+ > O+ O O O O O | > | O O O O O O O O O O O O | > ++ O O | > ++ | > ++ | > ++ | > | | > ++ | > ++ | > ++ *.. .*.. | > *+.*... .. *...*. *...*..*..*...*..*.. ..*.. *...*..*..*...*..* > | * *. .. | > ++ * | > ++--------------------------------------------------------------------+ > > > turbostat.Cor_W > > ++--------------------------------------------------------------------+ > O+ O O O O O O O O O | > | O O O O O O O O O O | > ++ | > ++ | > | | > ++ | > ++ | > ++ | > | | > ++ *.. | > *+.*... .. *...*..*..*...*..*..*...*..*.. ..*.. *... .*..*...*..* > | * *. .. *. | > ++ * | > ++--------------------------------------------------------------------+ > > > turbostat.RAM_W > > ++---------------------------------------------------------------------+ > | O O O O O O O O | > O+ O O O O O O O O O O | > | O | > ++ | > | | > ++ | > | | > ++ | > | * | > ++ .. + *.. | > | .*..* + *.. *.. + ..*..*.. .*... | > ++ .. + .. .. . + *. *...*. *..* > *..*...*..* * *...* * | > ++---------------------------------------------------------------------+ > > > [*] bisect-good sample > [O] bisect-bad sample > > > Disclaimer: > Results have been estimated based on internal Intel analysis and are > provided > for informational purposes only. Any difference in system hardware or > software > design or configuration may affect actual performance. > > Thanks, > Jet > > -- Yoshihiro YUNOMAE Software Platform Research Dept. Linux Technology Center Hitachi, Ltd., Yokohama Research Laboratory E-mail: yoshihiro.yunomae.ez@hitachi.com -- 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/