linux-kernel - Re: [PATCH 2/8] perf evsel: Fix the annotation for hardware events on hybrid

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Message-ID: <1d5f51e0-d187-14af-a349-437407404e5f@linux.intel.com>
Date:   Tue, 13 Jun 2023 19:57:58 -0400
From:   "Liang, Kan" <kan.liang@...ux.intel.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Ian Rogers <irogers@...gle.com>, mingo@...hat.com,
        peterz@...radead.org, namhyung@...nel.org, jolsa@...nel.org,
        adrian.hunter@...el.com, linux-perf-users@...r.kernel.org,
        linux-kernel@...r.kernel.org, ak@...ux.intel.com,
        eranian@...gle.com, ahmad.yasin@...el.com
Subject: Re: [PATCH 2/8] perf evsel: Fix the annotation for hardware events on
 hybrid



On 2023-06-13 5:18 p.m., Arnaldo Carvalho de Melo wrote:
> Em Tue, Jun 13, 2023 at 04:06:59PM -0400, Liang, Kan escreveu:
>>
>>
>> On 2023-06-13 3:35 p.m., Ian Rogers wrote:
>>> On Wed, Jun 7, 2023 at 9:27 AM <kan.liang@...ux.intel.com> wrote:
>>>>
>>>> From: Kan Liang <kan.liang@...ux.intel.com>
>>>>
>>>> The annotation for hardware events is wrong on hybrid. For example,
>>>>
>>>>  # ./perf stat -a sleep 1
>>>>
>>>>  Performance counter stats for 'system wide':
>>>>
>>>>          32,148.85 msec cpu-clock                        #   32.000 CPUs utilized
>>>>                374      context-switches                 #   11.633 /sec
>>>>                 33      cpu-migrations                   #    1.026 /sec
>>>>                295      page-faults                      #    9.176 /sec
>>>>         18,979,960      cpu_core/cycles/                 #  590.378 K/sec
>>>>        261,230,783      cpu_atom/cycles/                 #    8.126 M/sec                       (54.21%)
>>>>         17,019,732      cpu_core/instructions/           #  529.404 K/sec
>>>>         38,020,470      cpu_atom/instructions/           #    1.183 M/sec                       (63.36%)
>>>>          3,296,743      cpu_core/branches/               #  102.546 K/sec
>>>>          6,692,338      cpu_atom/branches/               #  208.167 K/sec                       (63.40%)
>>>>             96,421      cpu_core/branch-misses/          #    2.999 K/sec
>>>>          1,016,336      cpu_atom/branch-misses/          #   31.613 K/sec                       (63.38%)
>>>>
>>>> The hardware events have extended type on hybrid, but the evsel__match()
>>>> doesn't take it into account.
>>>>
>>>> Add a mask to filter the extended type on hybrid when checking the config.
>>>>
>>>> With the patch,
>>>>
>>>>  # ./perf stat -a sleep 1
>>>>
>>>>  Performance counter stats for 'system wide':
>>>>
>>>>          32,139.90 msec cpu-clock                        #   32.003 CPUs utilized
>>>>                343      context-switches                 #   10.672 /sec
>>>>                 32      cpu-migrations                   #    0.996 /sec
>>>>                 73      page-faults                      #    2.271 /sec
>>>>         13,712,841      cpu_core/cycles/                 #    0.000 GHz
>>>>        258,301,691      cpu_atom/cycles/                 #    0.008 GHz                         (54.20%)
>>>>         12,428,163      cpu_core/instructions/           #    0.91  insn per cycle
>>>>         37,786,557      cpu_atom/instructions/           #    2.76  insn per cycle              (63.35%)
>>>>          2,418,826      cpu_core/branches/               #   75.259 K/sec
>>>>          6,965,962      cpu_atom/branches/               #  216.739 K/sec                       (63.38%)
>>>>             72,150      cpu_core/branch-misses/          #    2.98% of all branches
>>>>          1,032,746      cpu_atom/branch-misses/          #   42.70% of all branches             (63.35%)
>>>>
>>>> Signed-off-by: Kan Liang <kan.liang@...ux.intel.com>
>>>> ---
>>>>  tools/perf/util/evsel.h       | 12 ++++++-----
>>>>  tools/perf/util/stat-shadow.c | 39 +++++++++++++++++++----------------
>>>>  2 files changed, 28 insertions(+), 23 deletions(-)
>>>>
>>>> diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
>>>> index b365b449c6ea..36a32e4ca168 100644
>>>> --- a/tools/perf/util/evsel.h
>>>> +++ b/tools/perf/util/evsel.h
>>>> @@ -350,9 +350,11 @@ u64 format_field__intval(struct tep_format_field *field, struct perf_sample *sam
>>>>
>>>>  struct tep_format_field *evsel__field(struct evsel *evsel, const char *name);
>>>>
>>>> -#define evsel__match(evsel, t, c)              \
>>>> +#define EVSEL_EVENT_MASK                       (~0ULL)
>>>> +
>>>> +#define evsel__match(evsel, t, c, m)                   \
>>>>         (evsel->core.attr.type == PERF_TYPE_##t &&      \
>>>> -        evsel->core.attr.config == PERF_COUNT_##c)
>>>> +        (evsel->core.attr.config & m) == PERF_COUNT_##c)
>>>
>>> The EVSEL_EVENT_MASK here isn't very intention revealing, perhaps we
>>> can remove it and do something like:
>>>
>>> static inline bool __evsel__match(const struct evsel *evsel, u32 type,
>>> u64 config)
>>> {
>>>   if ((type == PERF_TYPE_HARDWARE || type ==PERF_TYPE_HW_CACHE)  &&
>>> perf_pmus__supports_extended_type())
>>>      return (evsel->core.attr.config & PERF_HW_EVENT_MASK) == config;
>>>
>>>   return evsel->core.attr.config == config;
>>> }
>>> #define evsel__match(evsel, t, c) __evsel__match(evsel, PERF_TYPE_##t,
>>> PERF_COUNT_##c)
>>
>> Yes, the above code looks better. I will apply it in V2.
> 
> Please base v2 on tmp.perf-tools-next, tests are running and that branch
> will become perf-tools-next.
> 

Sure.

> Some patches from your series were cherry-picked there.

Thanks.

Kan