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[23.128.96.18]) by mx.google.com with ESMTP id j20si15832398ilo.0.2021.07.05.19.34.37; Mon, 05 Jul 2021 19:34:48 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=intel.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229884AbhGFCfk (ORCPT + 99 others); Mon, 5 Jul 2021 22:35:40 -0400 Received: from mga04.intel.com ([192.55.52.120]:40537 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229807AbhGFCfj (ORCPT ); Mon, 5 Jul 2021 22:35:39 -0400 X-IronPort-AV: E=McAfee;i="6200,9189,10036"; a="207218099" X-IronPort-AV: E=Sophos;i="5.83,327,1616482800"; d="scan'208";a="207218099" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 05 Jul 2021 19:33:01 -0700 X-IronPort-AV: E=Sophos;i="5.83,327,1616482800"; d="scan'208";a="456900822" Received: from yjin15-mobl1.ccr.corp.intel.com (HELO [10.238.4.147]) ([10.238.4.147]) by orsmga008-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 05 Jul 2021 19:32:59 -0700 Subject: Re: [PATCH] perf stat: Merge uncore events by default for hybrid platform To: acme@kernel.org, jolsa@kernel.org, peterz@infradead.org, mingo@redhat.com, alexander.shishkin@linux.intel.com Cc: Linux-kernel@vger.kernel.org, ak@linux.intel.com, kan.liang@intel.com, yao.jin@intel.com References: <20210616063004.2824-1-yao.jin@linux.intel.com> From: "Jin, Yao" Message-ID: Date: Tue, 6 Jul 2021 10:32:57 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: <20210616063004.2824-1-yao.jin@linux.intel.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, On 6/16/2021 2:30 PM, Jin Yao wrote: > On hybrid platform, by default stat aggregates and reports the event counts > per pmu. For example, > > # perf stat -e cycles -a true > > Performance counter stats for 'system wide': > > 1,400,445 cpu_core/cycles/ > 680,881 cpu_atom/cycles/ > > 0.001770773 seconds time elapsed > > While for uncore events, that's not a suitable method. Uncore has nothing > to do with hybrid. So for uncore events, we aggregate event counts from all > PMUs and report the counts without PMUs. > > Before: > > # perf stat -e arb/event=0x81,umask=0x1/,arb/event=0x84,umask=0x1/ -a true > > Performance counter stats for 'system wide': > > 2,058 uncore_arb_0/event=0x81,umask=0x1/ > 2,028 uncore_arb_1/event=0x81,umask=0x1/ > 0 uncore_arb_0/event=0x84,umask=0x1/ > 0 uncore_arb_1/event=0x84,umask=0x1/ > > 0.000614498 seconds time elapsed > > After: > > # perf stat -e arb/event=0x81,umask=0x1/,arb/event=0x84,umask=0x1/ -a true > > Performance counter stats for 'system wide': > > 3,996 arb/event=0x81,umask=0x1/ > 0 arb/event=0x84,umask=0x1/ > > 0.000630046 seconds time elapsed > > Of course, we also keep the '--no-merge' still works for uncore events. > > # perf stat -e arb/event=0x81,umask=0x1/,arb/event=0x84,umask=0x1/ --no-merge true > > Performance counter stats for 'system wide': > > 1,952 uncore_arb_0/event=0x81,umask=0x1/ > 1,921 uncore_arb_1/event=0x81,umask=0x1/ > 0 uncore_arb_0/event=0x84,umask=0x1/ > 0 uncore_arb_1/event=0x84,umask=0x1/ > > 0.000575536 seconds time elapsed > > Signed-off-by: Jin Yao > --- > tools/perf/builtin-stat.c | 3 --- > tools/perf/util/stat-display.c | 29 +++++++++++++++++++++++++---- > 2 files changed, 25 insertions(+), 7 deletions(-) > > diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c > index f9f74a514315..b67a44982b61 100644 > --- a/tools/perf/builtin-stat.c > +++ b/tools/perf/builtin-stat.c > @@ -2442,9 +2442,6 @@ int cmd_stat(int argc, const char **argv) > > evlist__check_cpu_maps(evsel_list); > > - if (perf_pmu__has_hybrid()) > - stat_config.no_merge = true; > - > /* > * Initialize thread_map with comm names, > * so we could print it out on output. > diff --git a/tools/perf/util/stat-display.c b/tools/perf/util/stat-display.c > index b759dfd633b4..c6070f4684ca 100644 > --- a/tools/perf/util/stat-display.c > +++ b/tools/perf/util/stat-display.c > @@ -595,6 +595,19 @@ static void collect_all_aliases(struct perf_stat_config *config, struct evsel *c > } > } > > +static bool is_uncore(struct evsel *evsel) > +{ > + struct perf_pmu *pmu; > + > + if (evsel->pmu_name) { > + pmu = perf_pmu__find(evsel->pmu_name); > + if (pmu) > + return pmu->is_uncore; > + } > + > + return false; > +} > + > static bool collect_data(struct perf_stat_config *config, struct evsel *counter, > void (*cb)(struct perf_stat_config *config, struct evsel *counter, void *data, > bool first), > @@ -603,10 +616,18 @@ static bool collect_data(struct perf_stat_config *config, struct evsel *counter, > if (counter->merged_stat) > return false; > cb(config, counter, data, true); > - if (config->no_merge) > - uniquify_event_name(counter); > - else if (counter->auto_merge_stats) > - collect_all_aliases(config, counter, cb, data); > + if (perf_pmu__has_hybrid()) { > + if (config->no_merge || !is_uncore(counter)) > + uniquify_event_name(counter); > + else if (counter->auto_merge_stats) > + collect_all_aliases(config, counter, cb, data); > + } else { > + if (config->no_merge) > + uniquify_event_name(counter); > + else if (counter->auto_merge_stats) > + collect_all_aliases(config, counter, cb, data); > + } > + > return true; > } > > Any comments for this patch? :) Thanks Jin Yao