From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 09D49ECDFD0 for ; Fri, 14 Sep 2018 09:37:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B0CED20853 for ; Fri, 14 Sep 2018 09:37:47 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B0CED20853 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727804AbeINOvZ (ORCPT ); Fri, 14 Sep 2018 10:51:25 -0400 Received: from mga14.intel.com ([192.55.52.115]:62088 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726776AbeINOvZ (ORCPT ); Fri, 14 Sep 2018 10:51:25 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by fmsmga103.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 14 Sep 2018 02:37:45 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.53,372,1531810800"; d="scan'208";a="88716932" Received: from linux.intel.com ([10.54.29.200]) by fmsmga004.fm.intel.com with ESMTP; 14 Sep 2018 02:37:45 -0700 Received: from [10.125.251.160] (abudanko-mobl.ccr.corp.intel.com [10.125.251.160]) by linux.intel.com (Postfix) with ESMTP id CD75158053F; Fri, 14 Sep 2018 02:37:42 -0700 (PDT) Subject: Re: [RFCv2 00/48] perf tools: Add threads to record command To: Jiri Olsa Cc: Jiri Olsa , Arnaldo Carvalho de Melo , lkml , Ingo Molnar , Namhyung Kim , Alexander Shishkin , Peter Zijlstra , Andi Kleen References: <20180913125450.21342-1-jolsa@kernel.org> <20180914082653.GG24224@krava> <20180914082858.GH24224@krava> From: Alexey Budankov Organization: Intel Corp. Message-ID: <71153c79-f0b9-4bf7-7491-202f46c6b5ed@linux.intel.com> Date: Fri, 14 Sep 2018 12:37:41 +0300 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <20180914082858.GH24224@krava> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 14.09.2018 11:28, Jiri Olsa wrote: > On Fri, Sep 14, 2018 at 10:26:53AM +0200, Jiri Olsa wrote: > > SNIP > >>>> The threaded monitoring currently can't monitor backward maps >>>> and there are probably more limitations which I haven't spotted >>>> yet. >>>> >>>> So far I tested on laptop: >>>> http://people.redhat.com/~jolsa/record_threads/test-4CPU.txt >>>> >>>> and a one bigger server: >>>> http://people.redhat.com/~jolsa/record_threads/test-208CPU.txt >>>> >>>> I can see decrease in recorded LOST events, but both the benchmark >>>> and the monitoring must be carefully configured wrt: >>>> - number of events (frequency) >>>> - size of the memory maps >>>> - size of events (callchains) >>>> - final perf.data size >>>> >>>> It's also available in: >>>> git://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git >>>> perf/record_threads >>>> >>>> thoughts? ;-) thanks >>>> jirka >>> >>> It is preferable to split into smaller pieces that bring >>> some improvement proved by metrics numbers and ready for >>> merging and upstream. Do we have more metrics than the >>> data loss from trace AIO patches? >> >> well the primary focus is to get more events in, >> so the LOST metric is the main one > > actualy I was hoping, could you please run it through the same > tests as you do for AIO code on some huge server? Yeah, I will, but it takes some time. > > thanks, > jirka >