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| author | Leo Yan <leo.yan@linaro.org> | 2021-05-19 12:15:44 +0800 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2021-05-25 09:49:05 -0300 |
| commit | e582badf1706a005359ef3e184fa97384e93f83a (patch) | |
| tree | 0aaa516d20375934ce100dc1c98d3979dfc172a6 /tools/perf/arch | |
| parent | 2f021954952f105e32383103cac06a095d9a1db6 (diff) | |
| download | linux-e582badf1706a005359ef3e184fa97384e93f83a.tar.bz2 | |
perf arm-spe: Correct sample flags for dummy event
The dummy event is mainly used for mmap, the TIME sample is only needed
for per-cpu case so that the perf tool can rely on the correct timing
for parsing symbols. And the CPU sample is useless for mmap.
The BRANCH_STACK sample bit will be always reset for the dummy event in
the function evsel__config(), so don't need to repeatedly reset it for
Arm SPE specific.
So this patch only enables TIME sample for per-cpu mmap.
Signed-off-by: Leo Yan <leo.yan@linaro.org>
Reviewed-by: James Clark <james.clark@arm.com>
Tested-by: James Clark <james.clark@arm.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Al Grant <Al.Grant@arm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
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: Peter Zijlstra <peterz@infradead.org>
Cc: Will Deacon <will@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org
Link: https://lore.kernel.org/r/20210519041546.1574961-3-leo.yan@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/arch')
| -rw-r--r-- | tools/perf/arch/arm64/util/arm-spe.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/tools/perf/arch/arm64/util/arm-spe.c b/tools/perf/arch/arm64/util/arm-spe.c index 902e73a64184..4c916626c203 100644 --- a/tools/perf/arch/arm64/util/arm-spe.c +++ b/tools/perf/arch/arm64/util/arm-spe.c @@ -135,9 +135,10 @@ static int arm_spe_recording_options(struct auxtrace_record *itr, tracking_evsel->core.attr.freq = 0; tracking_evsel->core.attr.sample_period = 1; - evsel__set_sample_bit(tracking_evsel, TIME); - evsel__set_sample_bit(tracking_evsel, CPU); - evsel__reset_sample_bit(tracking_evsel, BRANCH_STACK); + + /* In per-cpu case, always need the time of mmap events etc */ + if (!perf_cpu_map__empty(cpus)) + evsel__set_sample_bit(tracking_evsel, TIME); return 0; } |