linux-kernel - [PATCH] perf, tools, record: Support recording running/enabled time

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Date:	Tue, 24 Feb 2015 15:13:40 -0800
From:	Andi Kleen <andi@...stfloor.org>
To:	acme@...nel.org
Cc:	jolsa@...hat.com, linux-kernel@...r.kernel.org,
	namhyung@...nel.org, Andi Kleen <ak@...ux.intel.com>
Subject: [PATCH] perf, tools, record: Support recording running/enabled time

From: Andi Kleen <ak@...ux.intel.com>

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: Andi Kleen <ak@...ux.intel.com>
---
 tools/perf/Documentation/perf-record.txt | 3 +++
 tools/perf/builtin-record.c              | 2 ++
 tools/perf/perf.h                        | 1 +
 tools/perf/util/evsel.c                  | 6 ++++++
 4 files changed, 12 insertions(+)

diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt
index 1c7e50f..f293e96 100644
--- a/tools/perf/Documentation/perf-record.txt
+++ b/tools/perf/Documentation/perf-record.txt
@@ -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::
+Record running and enabled time for read events (:S)
+
 SEE ALSO
 --------
 linkperf:perf-stat[1], linkperf:perf-list[1]
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index d0d02a8..4fdad06 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -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()
 };
 
diff --git a/tools/perf/perf.h b/tools/perf/perf.h
index 1dabb85..1caa70a 100644
--- a/tools/perf/perf.h
+++ b/tools/perf/perf.h
@@ -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;
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index f93e520..bb4eff2 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -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
 	 *
-- 
1.9.3

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