[PATCH V10 2/8] perf, record: introduce --perf-freq option

[kan . liang]

From: Kan Liang <kan.liang@xxxxxxxxx>

To generate the frequency and performance output, perf must sample read
special events like cycles, ref-cycles, msr/tsc/, msr/aperf/ or
msr/mperf/.
With the --perf-freq option, perf record can automatically check and add
those event into evlist as group for sampling read.

Signed-off-by: Kan Liang <kan.liang@xxxxxxxxx>
Acked-by: Jiri Olsa <jolsa@xxxxxxxxxx>
---
 tools/perf/Documentation/perf-record.txt |  8 +++++++
 tools/perf/builtin-record.c              | 39 +++++++++++++++++++++++++++++++-
 tools/perf/util/event.h                  | 10 ++++++++
 3 files changed, 56 insertions(+), 1 deletion(-)

diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt
index 2e9ce77..8a65f37 100644
--- a/tools/perf/Documentation/perf-record.txt
+++ b/tools/perf/Documentation/perf-record.txt
@@ -308,6 +308,14 @@ This option sets the time out limit. The default value is 500 ms.
 Record context switch events i.e. events of type PERF_RECORD_SWITCH or
 PERF_RECORD_SWITCH_CPU_WIDE.
 
+--perf-freq::
+Collect CPU frequency and performance result per sample. It includes frequency,
+CPU utilization and actual percent performance (APERF/MPERF%).
+To generate the frequency and performance output, special events cycles,
+ref-cycles, msr/tsc/, msr/aperf/ or msr/mperf/ must be read by group.
+This option can automatically probe available special events on system, and
+read their sample value by group.
+
 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 142eeb3..8c4da18 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -13,7 +13,7 @@
 #include "util/util.h"
 #include "util/parse-options.h"
 #include "util/parse-events.h"
-
+#include "util/pmu.h"
 #include "util/callchain.h"
 #include "util/cgroup.h"
 #include "util/header.h"
@@ -50,6 +50,7 @@ struct record {
 	bool			no_buildid;
 	bool			no_buildid_cache;
 	long			samples;
+	bool			perf_freq;
 };
 
 static int record__write(struct record *rec, void *bf, size_t size)
@@ -948,6 +949,35 @@ out_free:
 	return ret;
 }
 
+const char *perf_freq_events[PERF_FREQ_MAX][3] = {
+	{ "msr", "tsc", "msr/tsc/" },
+	{ "msr", "aperf", "msr/aperf/" },
+	{ "msr", "mperf", "msr/mperf/" },
+	{ NULL, "cycles", "cycles" },
+	{ NULL, "ref-cycles", "ref-cycles" },
+};
+
+static int
+record_add_perf_freq_events(struct perf_evlist *evlist)
+{
+	int i;
+	char perf_freq_attrs[100];
+
+	strcpy(perf_freq_attrs, "{cycles,ref-cycles");
+	for (i = 0; i < PERF_FREQ_MAX; i++) {
+		if ((i == PERF_FREQ_CYCLES) ||
+		    (i == PERF_FREQ_REF_CYCLES))
+			continue;
+		if (pmu_have_event(perf_freq_events[i][0], perf_freq_events[i][1])) {
+			strcat(perf_freq_attrs, ",");
+			strcat(perf_freq_attrs, perf_freq_events[i][2]);
+		}
+	}
+	strcat(perf_freq_attrs, "}:S");
+
+	return parse_events(evlist, perf_freq_attrs, NULL);
+}
+
 static const char * const __record_usage[] = {
 	"perf record [<options>] [<command>]",
 	"perf record [<options>] -- <command> [<options>]",
@@ -1096,6 +1126,8 @@ struct option __record_options[] = {
 			"per thread proc mmap processing timeout in ms"),
 	OPT_BOOLEAN(0, "switch-events", &record.opts.record_switch_events,
 		    "Record context switch events"),
+	OPT_BOOLEAN(0, "perf-freq", &record.perf_freq,
+		    "Collect CPU frequency and performance result per sample"),
 	OPT_END()
 };
 
@@ -1157,6 +1189,11 @@ int cmd_record(int argc, const char **argv, const char *prefix __maybe_unused)
 	if (rec->no_buildid_cache || rec->no_buildid)
 		disable_buildid_cache();
 
+	if (rec->perf_freq && record_add_perf_freq_events(rec->evlist)) {
+		pr_err("Cannot set up freq and performance events\n");
+		goto out_symbol_exit;
+	}
+
 	if (rec->evlist->nr_entries == 0 &&
 	    perf_evlist__add_default(rec->evlist) < 0) {
 		pr_err("Not enough memory for event selector list\n");
diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
index f729df5..3439462 100644
--- a/tools/perf/util/event.h
+++ b/tools/perf/util/event.h
@@ -177,6 +177,16 @@ enum {
 	PERF_IP_FLAG_TRACE_BEGIN	|\
 	PERF_IP_FLAG_TRACE_END)
 
+enum perf_freqs {
+	PERF_FREQ_TSC		= 0,
+	PERF_FREQ_APERF		= 1,
+	PERF_FREQ_MPERF		= 2,
+	PERF_FREQ_CYCLES	= 3,
+	PERF_FREQ_REF_CYCLES	= 4,
+
+	PERF_FREQ_MAX
+};
+
 struct perf_sample {
 	u64 ip;
 	u32 pid, tid;
-- 
1.8.3.1

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