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X-CSE-ConnectionGUID: WpXPXL8fRROZaWleEiYRmQ== X-CSE-MsgGUID: oBpXhuNdTVmvris9ONIg6g== X-IronPort-AV: E=McAfee;i="6700,10204,11127"; a="28388792" X-IronPort-AV: E=Sophos;i="6.09,193,1716274800"; d="scan'208";a="28388792" Received: from orviesa004.jf.intel.com ([10.64.159.144]) by fmvoesa103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 08 Jul 2024 18:58:47 -0700 X-CSE-ConnectionGUID: BI29zawvT+6x6vsfXqrhEA== X-CSE-MsgGUID: hsuL/474TBi6VJ013cxzXA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.09,193,1716274800"; d="scan'208";a="52873582" Received: from dapengmi-mobl1.ccr.corp.intel.com (HELO [10.124.225.1]) ([10.124.225.1]) by orviesa004-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 08 Jul 2024 18:58:44 -0700 Message-ID: <751d5d08-c3b3-42eb-840b-259dbf83fc11@linux.intel.com> Date: Tue, 9 Jul 2024 09:58:42 +0800 Precedence: bulk X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [Patch v2 1/5] perf x86/topdown: Complete topdown slots/metrics events check To: "Liang, Kan" , Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Ian Rogers , Adrian Hunter , Alexander Shishkin Cc: linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, Yongwei Ma , Dapeng Mi References: <20240708144204.839486-1-dapeng1.mi@linux.intel.com> <20240708144204.839486-2-dapeng1.mi@linux.intel.com> <821ea427-aeef-4269-9af8-4cdb8cf32ca8@linux.intel.com> Content-Language: en-US From: "Mi, Dapeng" In-Reply-To: <821ea427-aeef-4269-9af8-4cdb8cf32ca8@linux.intel.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 7/8/2024 9:28 PM, Liang, Kan wrote: > > On 2024-07-08 10:42 a.m., Dapeng Mi wrote: >> It's not complete to check whether an event is a topdown slots or >> topdown metrics event by only comparing the event name since user >> may assign the event by RAW format, e.g. >> >> perf stat -e '{instructions,cpu/r400/,cpu/r8300/}' sleep 1 >> >> Performance counter stats for 'sleep 1': >> >> instructions >> cpu/r400/ >> cpu/r8300/ >> >> 1.002917796 seconds time elapsed >> >> 0.002955000 seconds user >> 0.000000000 seconds sys >> >> The RAW format slots and topdown-be-bound events are not recognized and >> not regroup the events, and eventually cause error. >> >> Thus add two helpers arch_is_topdown_slots()/arch_is_topdown_metrics() >> to detect whether an event is topdown slots/metrics event by comparing >> the event config directly, and use these two helpers to replace the >> original event name comparisons. >> >> Signed-off-by: Dapeng Mi >> --- >> tools/perf/arch/x86/util/evlist.c | 8 +++--- >> tools/perf/arch/x86/util/evsel.c | 3 ++- >> tools/perf/arch/x86/util/topdown.c | 43 +++++++++++++++++++++++++++++- >> tools/perf/arch/x86/util/topdown.h | 2 ++ >> 4 files changed, 50 insertions(+), 6 deletions(-) >> >> diff --git a/tools/perf/arch/x86/util/evlist.c b/tools/perf/arch/x86/util/evlist.c >> index b1ce0c52d88d..332e8907f43e 100644 >> --- a/tools/perf/arch/x86/util/evlist.c >> +++ b/tools/perf/arch/x86/util/evlist.c >> @@ -78,14 +78,14 @@ int arch_evlist__cmp(const struct evsel *lhs, const struct evsel *rhs) >> if (topdown_sys_has_perf_metrics() && >> (arch_evsel__must_be_in_group(lhs) || arch_evsel__must_be_in_group(rhs))) { >> /* Ensure the topdown slots comes first. */ >> - if (strcasestr(lhs->name, "slots") && !strcasestr(lhs->name, "uops_retired.slots")) >> + if (arch_is_topdown_slots(lhs)) >> return -1; >> - if (strcasestr(rhs->name, "slots") && !strcasestr(rhs->name, "uops_retired.slots")) >> + if (arch_is_topdown_slots(rhs)) >> return 1; >> /* Followed by topdown events. */ >> - if (strcasestr(lhs->name, "topdown") && !strcasestr(rhs->name, "topdown")) >> + if (arch_is_topdown_metrics(lhs) && !arch_is_topdown_metrics(rhs)) >> return -1; >> - if (!strcasestr(lhs->name, "topdown") && strcasestr(rhs->name, "topdown")) >> + if (!arch_is_topdown_metrics(lhs) && arch_is_topdown_metrics(rhs)) >> return 1; >> } >> >> diff --git a/tools/perf/arch/x86/util/evsel.c b/tools/perf/arch/x86/util/evsel.c >> index 090d0f371891..181f2ba0bb2a 100644 >> --- a/tools/perf/arch/x86/util/evsel.c >> +++ b/tools/perf/arch/x86/util/evsel.c >> @@ -6,6 +6,7 @@ >> #include "util/pmu.h" >> #include "util/pmus.h" >> #include "linux/string.h" >> +#include "topdown.h" >> #include "evsel.h" >> #include "util/debug.h" >> #include "env.h" >> @@ -44,7 +45,7 @@ bool arch_evsel__must_be_in_group(const struct evsel *evsel) >> strcasestr(evsel->name, "uops_retired.slots")) >> return false; >> >> - return strcasestr(evsel->name, "topdown") || strcasestr(evsel->name, "slots"); >> + return arch_is_topdown_metrics(evsel) || arch_is_topdown_slots(evsel); >> } >> >> int arch_evsel__hw_name(struct evsel *evsel, char *bf, size_t size) >> diff --git a/tools/perf/arch/x86/util/topdown.c b/tools/perf/arch/x86/util/topdown.c >> index 3f9a267d4501..e805065bb7e1 100644 >> --- a/tools/perf/arch/x86/util/topdown.c >> +++ b/tools/perf/arch/x86/util/topdown.c >> @@ -32,6 +32,47 @@ bool topdown_sys_has_perf_metrics(void) >> } >> >> #define TOPDOWN_SLOTS 0x0400 >> +bool arch_is_topdown_slots(const struct evsel *evsel) >> +{ >> + if (evsel->core.attr.config == TOPDOWN_SLOTS) >> + return true; >> + >> + return false; >> +} >> + >> +static int compare_topdown_event(void *vstate, struct pmu_event_info *info) >> +{ >> + int *config = vstate; >> + int event = 0; >> + int umask = 0; >> + char *str; >> + > The compare is only needed for the "topdown" event. > Check the name first before the sscanf and compare. > > if (!strcasestr(info->name, "topdown")) > return 0; Yes, thanks. >> + str = strcasestr(info->str, "event="); >> + if (str) >> + sscanf(str, "event=%x", &event); >> + >> + str = strcasestr(info->str, "umask="); >> + if (str) >> + sscanf(str, "umask=%x", &umask); >> + >> + if (strcasestr(info->name, "topdown") && event == 0 && >> + *config == (event | umask << 8)) >> + return 1; >> + >> + return 0; >> +} >> + >> +bool arch_is_topdown_metrics(const struct evsel *evsel) >> +{ >> + struct perf_pmu *pmu = evsel__find_pmu(evsel); >> + int config = evsel->core.attr.config; >> + > The topdown events are only available for the core PMU. > You may want to return earlier for the !core PMUs. > > if (!pmu || !pmu->is_core) > return false; Sure. Thanks. > > Thanks, > Kan >> + if (pmu && perf_pmu__for_each_event(pmu, false, &config, >> + compare_topdown_event)) >> + return true; >> + >> + return false; >> +} >> >> /* >> * Check whether a topdown group supports sample-read. >> @@ -44,7 +85,7 @@ bool arch_topdown_sample_read(struct evsel *leader) >> if (!evsel__sys_has_perf_metrics(leader)) >> return false; >> >> - if (leader->core.attr.config == TOPDOWN_SLOTS) >> + if (arch_is_topdown_slots(leader)) >> return true; >> >> return false; >> diff --git a/tools/perf/arch/x86/util/topdown.h b/tools/perf/arch/x86/util/topdown.h >> index 46bf9273e572..1bae9b1822d7 100644 >> --- a/tools/perf/arch/x86/util/topdown.h >> +++ b/tools/perf/arch/x86/util/topdown.h >> @@ -3,5 +3,7 @@ >> #define _TOPDOWN_H 1 >> >> bool topdown_sys_has_perf_metrics(void); >> +bool arch_is_topdown_slots(const struct evsel *evsel); >> +bool arch_is_topdown_metrics(const struct evsel *evsel); >> >> #endif