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Subject[PATCH V8 3/7] perf, record: introduce --freq-perf option
Date
From: Kan Liang <kan.liang@intel.com>

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 --freq-perf option, perf record can automatically check and add
those event into evlist for sampling read.

Signed-off-by: Kan Liang <kan.liang@intel.com>
---
tools/perf/Documentation/perf-record.txt | 4 ++++
tools/perf/builtin-record.c | 39 +++++++++++++++++++++++++++++++-
tools/perf/util/session.h | 10 ++++++++
3 files changed, 52 insertions(+), 1 deletion(-)

diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt
index 2e9ce77..3f40712 100644
--- a/tools/perf/Documentation/perf-record.txt
+++ b/tools/perf/Documentation/perf-record.txt
@@ -308,6 +308,10 @@ 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.

+--freq-perf::
+Add frequency and performance related events to do sample read.
+These events include cycles, ref-cycles, msr/tsc/, msr/aperf/ and msr/mperf/.
+
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..e87dda3 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 freq_perf;
};

static int record__write(struct record *rec, void *bf, size_t size)
@@ -948,6 +949,35 @@ out_free:
return ret;
}

+const char *freq_perf_events[FREQ_PERF_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_freq_perf_events(struct perf_evlist *evlist)
+{
+ int i;
+ char freq_perf_attrs[100];
+
+ strcpy(freq_perf_attrs, "{cycles,ref-cycles");
+ for (i = 0; i < FREQ_PERF_MAX; i++) {
+ if ((i == FREQ_PERF_CYCLES) ||
+ (i == FREQ_PERF_REF_CYCLES))
+ continue;
+ if (pmu_have_event(freq_perf_events[i][0], freq_perf_events[i][1])) {
+ strcat(freq_perf_attrs, ",");
+ strcat(freq_perf_attrs, freq_perf_events[i][2]);
+ }
+ }
+ strcat(freq_perf_attrs, "}:S");
+
+ return parse_events(evlist, freq_perf_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, "freq-perf", &record.freq_perf,
+ "Add frequency and performance related events to do sample read."),
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->freq_perf && record_add_freq_perf_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/session.h b/tools/perf/util/session.h
index b44afc7..3915be7 100644
--- a/tools/perf/util/session.h
+++ b/tools/perf/util/session.h
@@ -42,6 +42,16 @@ struct perf_session {
#define PRINT_IP_OPT_ONELINE (1<<4)
#define PRINT_IP_OPT_SRCLINE (1<<5)

+enum perf_freq_perf_index {
+ FREQ_PERF_TSC = 0,
+ FREQ_PERF_APERF = 1,
+ FREQ_PERF_MPERF = 2,
+ FREQ_PERF_CYCLES = 3,
+ FREQ_PERF_REF_CYCLES = 4,
+
+ FREQ_PERF_MAX
+};
+
struct perf_tool;

struct perf_session *perf_session__new(struct perf_data_file *file,
--
1.8.3.1


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