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authorGerman Gomez <german.gomez@arm.com>2021-11-11 13:36:23 +0000
committerArnaldo Carvalho de Melo <acme@redhat.com>2021-11-13 18:11:50 -0300
commit455c988225c7eee84c7a2f86984404825a1830bb (patch)
treeb7614e611c531559d926721cf83f9c27a955bbff
parent9dc9855f18ba25d2bc536ea5ba6682855e385d66 (diff)
downloadlinux-455c988225c7eee84c7a2f86984404825a1830bb.tar.bz2
perf arm-spe: Update --switch-events docs in 'perf record'
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. Reviewed-by: Leo Yan <leo.yan@linaro.org> Signed-off-by: German Gomez <german.gomez@arm.com> Acked-by: Namhyung Kim <namhyung@kernel.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.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: Will Deacon <will@kernel.org> Cc: linux-arm-kernel@lists.infradead.org Link: https://lore.kernel.org/r/20211111133625.193568-3-german.gomez@arm.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
-rw-r--r--tools/perf/Documentation/perf-record.txt2
-rw-r--r--tools/perf/arch/arm64/util/arm-spe.c4
2 files changed, 4 insertions, 2 deletions
diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt
index 2d7df8703cf2..3cf7bac67239 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 d32431ac15cc..2100d46ccf5e 100644
--- a/tools/perf/arch/arm64/util/arm-spe.c
+++ b/tools/perf/arch/arm64/util/arm-spe.c
@@ -254,8 +254,10 @@ 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;