linux-kernel - Re: [PATCH v4 15/25] perf stat: Filter out unmatched aggregation for hybrid event

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <1da39794-bdc3-2a9d-4038-9e95e2c02660@linux.intel.com>
Date:   Thu, 22 Apr 2021 11:10:54 +0800
From:   "Jin, Yao" <yao.jin@...ux.intel.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     acme@...nel.org, jolsa@...nel.org, peterz@...radead.org,
        mingo@...hat.com, alexander.shishkin@...ux.intel.com,
        Linux-kernel@...r.kernel.org, ak@...ux.intel.com,
        kan.liang@...el.com, yao.jin@...el.com
Subject: Re: [PATCH v4 15/25] perf stat: Filter out unmatched aggregation for
 hybrid event

Hi Jiri,

On 4/22/2021 2:29 AM, Jiri Olsa wrote:
> On Fri, Apr 16, 2021 at 10:05:07PM +0800, Jin Yao wrote:
> 
> SNIP
> 
>> diff --git a/tools/perf/util/stat-display.c b/tools/perf/util/stat-display.c
>> index 5255d78b1c30..15eafd249e46 100644
>> --- a/tools/perf/util/stat-display.c
>> +++ b/tools/perf/util/stat-display.c
>> @@ -643,6 +643,20 @@ static void aggr_cb(struct perf_stat_config *config,
>>   	}
>>   }
>>   
>> +static bool aggr_id_hybrid_matched(struct perf_stat_config *config,
>> +				   struct evsel *counter, struct aggr_cpu_id id)
>> +{
>> +	struct aggr_cpu_id s;
>> +
>> +	for (int i = 0; i < evsel__nr_cpus(counter); i++) {
>> +		s = config->aggr_get_id(config, evsel__cpus(counter), i);
>> +		if (cpu_map__compare_aggr_cpu_id(s, id))
>> +			return true;
>> +	}
>> +
>> +	return false;
>> +}
>> +
>>   static void print_counter_aggrdata(struct perf_stat_config *config,
>>   				   struct evsel *counter, int s,
>>   				   char *prefix, bool metric_only,
>> @@ -656,6 +670,12 @@ static void print_counter_aggrdata(struct perf_stat_config *config,
>>   	double uval;
>>   
>>   	ad.id = id = config->aggr_map->map[s];
>> +
>> +	if (perf_pmu__has_hybrid() &&
>> +	    !aggr_id_hybrid_matched(config, counter, id)) {
>> +		return;
>> +	}
>> +
>>   	ad.val = ad.ena = ad.run = 0;
>>   	ad.nr = 0;
>>   	if (!collect_data(config, counter, aggr_cb, &ad))
> 
> there's same check in aggr_cb, so it seems like we could just make check in here:
> 
> 	if (perf_pmu__has_hybrid() && ad.ena == 0)
> 		return;
> 
> without another extra loop
> 
> jirka
> 

I guess you recommended the patch like this:

  static void print_counter_aggrdata(struct perf_stat_config *config,
                                    struct evsel *counter, int s,
                                    char *prefix, bool metric_only,
@@ -670,17 +656,14 @@ static void print_counter_aggrdata(struct perf_stat_config *config,
         double uval;

         ad.id = id = config->aggr_map->map[s];
         ad.val = ad.ena = ad.run = 0;
         ad.nr = 0;
         if (!collect_data(config, counter, aggr_cb, &ad))
                 return;

+       if (perf_pmu__has_hybrid() && ad.ena == 0)
+               return;
+
         nr = ad.nr;
         ena = ad.ena;
         run = ad.run;

Yes, it works. The test log is,

# perf stat --per-core -e cpu_core/cycles/ -a -- sleep 1

  Performance counter stats for 'system wide':

S0-D0-C0           2          2,341,923      cpu_core/cycles/
S0-D0-C4           2          1,707,933      cpu_core/cycles/
S0-D0-C8           2            845,805      cpu_core/cycles/
S0-D0-C12          2          1,001,961      cpu_core/cycles/
S0-D0-C16          2            932,004      cpu_core/cycles/
S0-D0-C20          2          1,778,603      cpu_core/cycles/
S0-D0-C24          2            804,448      cpu_core/cycles/
S0-D0-C28          2            178,360      cpu_core/cycles/

        1.002264168 seconds time elapsed

Thanks
Jin Yao