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perf arm-spe: Use advertised caps/min_interval as default sample_period

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When recording SPE traces, the default sample_period is currently being
set to 1 in the perf_event_attr fields, instead of the value advertised
in '/sys/devices/arm_spe_0/caps/min_interval':

Before:

  $ perf record -e arm_spe// -vv -- sleep 1
  [...]
    { sample_period, sample_freq }   1
  [...]

Use the value from the above sysfs location as a more sensible default
(it was already being read, but the value not being used)

After:

  $ perf record -e arm_spe// -vv -- sleep 1
  [...]
    { sample_period, sample_freq }   1024
  [...]

Reviewed-by: Leo Yan <leo.yan@linaro.org>
Signed-off-by: German Gomez <german.gomez@arm.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Garry <john.garry@huawei.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Will Deacon <will@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org
Link: https://lore.kernel.org/r/20220221171042.58460-1-german.gomez@arm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
German Gomez 2022-02-21 17:10:42 +00:00 committed by Arnaldo Carvalho de Melo
parent 8c4c7016dd
commit 521f2688c5
1 changed files with 1 additions and 1 deletions
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2
tools/perf/arch/arm64/util/arm-spe.c
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@ -158,7 +158,7 @@ static int arm_spe_recording_options(struct auxtrace_record *itr,
return -EINVAL;
}
evsel->core.attr.freq = 0;
evsel->core.attr.sample_period = 1;
evsel->core.attr.sample_period = arm_spe_pmu->default_config->sample_period;
arm_spe_evsel = evsel;
opts->full_auxtrace = true;
}