Commit 61f11e9b authored by German Gomez's avatar German Gomez Committed by Zheng Zengkai
Browse files

perf arm-spe: Update --switch-events docs in 'perf record' 

mainline inclusion
from mainline-v5.16-rc1
commit 455c9882
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4NGPV


CVE: NA

-------------------------------------------------

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: default avatarLeo Yan <leo.yan@linaro.org>
Signed-off-by: default avatarGerman Gomez <german.gomez@arm.com>
Acked-by: default avatarNamhyung 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: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: default avatarWei Li <liwei391@huawei.com>
Reviewed-by: default avatarYang Jihong <yangjihong1@huawei.com>
Signed-off-by: default avatarZheng Zengkai <zhengzengkai@huawei.com>
parent 069dc2e4

tools/perf/Documentation/perf-record.txt

+1 −1
Original line number Diff line number Diff line
@@ -463,7 +463,7 @@ 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.

tools/perf/arch/arm64/util/arm-spe.c

+3 −1
Original line number Diff line number Diff line
@@ -254,7 +254,9 @@ 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 */

		if (!record_opts__no_switch_events(opts))

			tracking_evsel->core.attr.context_switch = 1;

	}