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Commit 85c273d2 authored by Andi Kleen's avatar Andi Kleen Committed by Arnaldo Carvalho de Melo
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perf record: Support recording running/enabled time 



Add an option to perf record to record running/enabled time for read
events, similar to what stat does.

This is useful to understand multiplexing problems.

Right now the report support is not great, but at least report -D
already supports it.

Signed-off-by: default avatarAndi Kleen <ak@linux.intel.com>
Acked-by: default avatarJiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lkml.kernel.org/r/1424819620-16043-1-git-send-email-andi@firstfloor.org


[ Fixed the Documentation entry to match the OPT_BOOLEAN one ]
Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 50674065

tools/perf/Documentation/perf-record.txt

+3 −0
Original line number Diff line number Diff line
@@ -241,6 +241,9 @@ Capture machine state (registers) at interrupt, i.e., on counter overflows for 
each sample. List of captured registers depends on the architecture. This option

is off by default.



--running-time::

Record running and enabled time for read events (:S)



SEE ALSO

--------

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

tools/perf/builtin-record.c

+2 −0
Original line number Diff line number Diff line
@@ -839,6 +839,8 @@ struct option __record_options[] = { 
		    "use per-thread mmaps"),

	OPT_BOOLEAN('I', "intr-regs", &record.opts.sample_intr_regs,

		    "Sample machine registers on interrupt"),

	OPT_BOOLEAN(0, "running-time", &record.opts.running_time,

		    "Record running/enabled time of read (:S) events"),

	OPT_END()

};

tools/perf/perf.h

+1 −0
Original line number Diff line number Diff line
@@ -53,6 +53,7 @@ struct record_opts { 
	bool	     sample_time;

	bool	     period;

	bool	     sample_intr_regs;

	bool	     running_time;

	unsigned int freq;

	unsigned int mmap_pages;

	unsigned int user_freq;

tools/perf/util/evsel.c

+6 −0
Original line number Diff line number Diff line
@@ -734,6 +734,12 @@ void perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts) 
	if (opts->sample_transaction)

		perf_evsel__set_sample_bit(evsel, TRANSACTION);



	if (opts->running_time) {

		evsel->attr.read_format |=

			PERF_FORMAT_TOTAL_TIME_ENABLED |

			PERF_FORMAT_TOTAL_TIME_RUNNING;

	}



	/*

	 * XXX see the function comment above

	 *