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Commit b757bb09 authored by Adrian Hunter's avatar Adrian Hunter Committed by Arnaldo Carvalho de Melo
Browse files

perf record: Add option --switch-events to select PERF_RECORD_SWITCH events 



Add an option to select PERF_RECORD_SWITCH events.

Signed-off-by: default avatarAdrian Hunter <adrian.hunter@intel.com>
Acked-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
Tested-by: default avatarJiri Olsa <jolsa@redhat.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Pawel Moll <pawel.moll@arm.com>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1437471846-26995-4-git-send-email-adrian.hunter@intel.com


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 0286039f

tools/perf/Documentation/perf-record.txt

+4 −0
Original line number Diff line number Diff line
@@ -293,6 +293,10 @@ When processing pre-existing threads /proc/XXX/mmap, it may take a long time, 
because the file may be huge. A time out is needed in such cases.

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.



SEE ALSO

--------

linkperf:perf-stat[1], linkperf:perf-list[1]

tools/perf/builtin-record.c

+7 −0
Original line number Diff line number Diff line
@@ -1075,6 +1075,8 @@ struct option __record_options[] = { 
			  "opts", "AUX area tracing Snapshot Mode", ""),

	OPT_UINTEGER(0, "proc-map-timeout", &record.opts.proc_map_timeout,

			"per thread proc mmap processing timeout in ms"),

	OPT_BOOLEAN(0, "switch-events", &record.opts.record_switch_events,

		    "Record context switch events"),

	OPT_END()

};
@@ -1102,6 +1104,11 @@ int cmd_record(int argc, const char **argv, const char *prefix __maybe_unused) 
			  " system-wide mode\n");

		usage_with_options(record_usage, record_options);

	}

	if (rec->opts.record_switch_events &&

	    !perf_can_record_switch_events()) {

		ui__error("kernel does not support recording context switch events (--switch-events option)\n");

		usage_with_options(record_usage, record_options);

	}



	if (!rec->itr) {

		rec->itr = auxtrace_record__init(rec->evlist, &err);

tools/perf/perf.h

+1 −0
Original line number Diff line number Diff line
@@ -57,6 +57,7 @@ struct record_opts { 
	bool	     running_time;

	bool	     full_auxtrace;

	bool	     auxtrace_snapshot_mode;

	bool	     record_switch_events;

	unsigned int freq;

	unsigned int mmap_pages;

	unsigned int auxtrace_mmap_pages;

tools/perf/util/evlist.h

+1 −0
Original line number Diff line number Diff line
@@ -114,6 +114,7 @@ void perf_evlist__close(struct perf_evlist *evlist); 


void perf_evlist__set_id_pos(struct perf_evlist *evlist);

bool perf_can_sample_identifier(void);

bool perf_can_record_switch_events(void);

void perf_evlist__config(struct perf_evlist *evlist, struct record_opts *opts);

int record_opts__config(struct record_opts *opts);

tools/perf/util/evsel.c

+3 −0
Original line number Diff line number Diff line
@@ -738,6 +738,9 @@ void perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts) 
	attr->mmap2 = track && !perf_missing_features.mmap2;

	attr->comm  = track;



	if (opts->record_switch_events)

		attr->context_switch = track;



	if (opts->sample_transaction)

		perf_evsel__set_sample_bit(evsel, TRANSACTION);