Messages in this thread Patch in this message | | | From | German Gomez <> | Subject | [PATCH v3 2/4] perf arm-spe: Update --switch-events docs in perf-record | Date | Thu, 11 Nov 2021 13:36:23 +0000 |
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Update perf-record docs and Arm SPE recording options so that they are consistent. This includes supporting the --no-switch-events flag in Arm SPE as well.
Signed-off-by: German Gomez <german.gomez@arm.com> Acked-by: Namhyung Kim <namhyung@kernel.org> Reviewed-by: Leo Yan <leo.yan@linaro.org> --- tools/perf/Documentation/perf-record.txt | 2 +- tools/perf/arch/arm64/util/arm-spe.c | 4 +++- 2 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt index 2d7df8703..3cf7bac67 100644 --- a/tools/perf/Documentation/perf-record.txt +++ b/tools/perf/Documentation/perf-record.txt @@ -469,7 +469,7 @@ This option sets the time out limit. The default value is 500 ms. --switch-events:: Record context switch events i.e. events of type PERF_RECORD_SWITCH or -PERF_RECORD_SWITCH_CPU_WIDE. In some cases (e.g. Intel PT or CoreSight) +PERF_RECORD_SWITCH_CPU_WIDE. In some cases (e.g. Intel PT, CoreSight or Arm SPE) switch events will be enabled automatically, which can be suppressed by by the option --no-switch-events. diff --git a/tools/perf/arch/arm64/util/arm-spe.c b/tools/perf/arch/arm64/util/arm-spe.c index 58ba8d15c..725a06cd2 100644 --- a/tools/perf/arch/arm64/util/arm-spe.c +++ b/tools/perf/arch/arm64/util/arm-spe.c @@ -169,8 +169,10 @@ static int arm_spe_recording_options(struct auxtrace_record *itr, if (!perf_cpu_map__empty(cpus)) { evsel__set_sample_bit(tracking_evsel, TIME); evsel__set_sample_bit(tracking_evsel, CPU); + /* also track task context switch */ - tracking_evsel->core.attr.context_switch = 1; + if (!record_opts__no_switch_events(opts)) + tracking_evsel->core.attr.context_switch = 1; } return 0; -- 2.25.1
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