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Date: Wed, 2 May 2018 10:42:12 -0700
From: tip-bot for Jiri Olsa <tipbot@...or.com>
To: linux-tip-commits@...r.kernel.org
Cc: acme@...hat.com, alexander.shishkin@...ux.intel.com,
namhyung@...nel.org, tglx@...utronix.de, hpa@...or.com,
dsahern@...il.com, jolsa@...nel.org, mingo@...nel.org,
linux-kernel@...r.kernel.org, peterz@...radead.org
Subject: [tip:perf/core] perf stat: Add --table option to display time of
each run
Commit-ID: e55c14af488a728d314777f038bd05db18afc1e9
Gitweb: https://git.kernel.org/tip/e55c14af488a728d314777f038bd05db18afc1e9
Author: Jiri Olsa <jolsa@...nel.org>
AuthorDate: Mon, 23 Apr 2018 11:08:21 +0200
Committer: Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Thu, 26 Apr 2018 09:30:27 -0300
perf stat: Add --table option to display time of each run
Add --table option to display time for each run (-r option), like:
$ perf stat --null -r 5 --table perf bench sched pipe
Performance counter stats for './perf bench sched pipe' (5 runs):
# Table of individual measurements:
5.379 (-0.176)
5.243 (-0.311)
5.238 (-0.317)
5.536 (-0.019)
6.377 (+0.823)
# Final result:
5.555 +- 0.213 seconds time elapsed ( +- 3.83% )
Suggested-by: Ingo Molnar <mingo@...nel.org>
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Link: http://lkml.kernel.org/r/20180423090823.32309-8-jolsa@kernel.org
[ Document the new option in 'perf stat's man page ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
tools/perf/Documentation/perf-stat.txt | 16 ++++++++++
tools/perf/builtin-stat.c | 56 +++++++++++++++++++++++++++++++---
tools/perf/util/stat.h | 3 +-
3 files changed, 69 insertions(+), 6 deletions(-)
diff --git a/tools/perf/Documentation/perf-stat.txt b/tools/perf/Documentation/perf-stat.txt
index e6c3b4e555c2..72a2414513bd 100644
--- a/tools/perf/Documentation/perf-stat.txt
+++ b/tools/perf/Documentation/perf-stat.txt
@@ -116,6 +116,22 @@ Do not aggregate counts across all monitored CPUs.
print counts using a CSV-style output to make it easy to import directly into
spreadsheets. Columns are separated by the string specified in SEP.
+--table:: Display time for each run (-r option), in a table format, e.g.:
+
+ $ perf stat --null -r 5 --table perf bench sched pipe
+
+ Performance counter stats for 'perf bench sched pipe' (5 runs):
+
+ # Table of individual measurements:
+ 5.379 (-0.176)
+ 5.243 (-0.311)
+ 5.238 (-0.317)
+ 5.536 (-0.019)
+ 6.377 (+0.823)
+
+ # Final result:
+ 5.555 +- 0.213 seconds time elapsed ( +- 3.83% )
+
-G name::
--cgroup name::
monitor only in the container (cgroup) called "name". This option is available only
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 3a94647ef6bc..72553937c010 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -164,6 +164,7 @@ static bool forever = false;
static bool metric_only = false;
static bool force_metric_only = false;
static bool no_merge = false;
+static bool walltime_run_table = false;
static struct timespec ref_time;
static struct cpu_map *aggr_map;
static aggr_get_id_t aggr_get_id;
@@ -173,6 +174,7 @@ static const char *output_name;
static int output_fd;
static int print_free_counters_hint;
static int print_mixed_hw_group_error;
+static u64 *walltime_run;
struct perf_stat {
bool record;
@@ -569,7 +571,7 @@ static struct perf_evsel *perf_evsel__reset_weak_group(struct perf_evsel *evsel)
return leader;
}
-static int __run_perf_stat(int argc, const char **argv)
+static int __run_perf_stat(int argc, const char **argv, int run_idx)
{
int interval = stat_config.interval;
int times = stat_config.times;
@@ -752,6 +754,9 @@ try_again:
t1 = rdclock();
+ if (walltime_run_table)
+ walltime_run[run_idx] = t1 - t0;
+
update_stats(&walltime_nsecs_stats, t1 - t0);
/*
@@ -766,7 +771,7 @@ try_again:
return WEXITSTATUS(status);
}
-static int run_perf_stat(int argc, const char **argv)
+static int run_perf_stat(int argc, const char **argv, int run_idx)
{
int ret;
@@ -779,7 +784,7 @@ static int run_perf_stat(int argc, const char **argv)
if (sync_run)
sync();
- ret = __run_perf_stat(argc, argv);
+ ret = __run_perf_stat(argc, argv, run_idx);
if (ret)
return ret;
@@ -1772,6 +1777,27 @@ static int get_precision(double num)
return lround(ceil(-log10(num)));
}
+static void print_table(FILE *output, int precision, double avg)
+{
+ char tmp[64];
+ int idx, indent = 0;
+
+ scnprintf(tmp, 64, " %17.*f", precision, avg);
+ while (tmp[indent] == ' ')
+ indent++;
+
+ fprintf(output, "%*s# Table of individual measurements:\n", indent, "");
+
+ for (idx = 0; idx < run_count; idx++) {
+ double run = (double) walltime_run[idx] / NSEC_PER_SEC;
+
+ fprintf(output, " %17.*f (%+.*f)\n",
+ precision, run, precision, run - avg);
+ }
+
+ fprintf(output, "\n%*s# Final result:\n", indent, "");
+}
+
static void print_footer(void)
{
double avg = avg_stats(&walltime_nsecs_stats) / NSEC_PER_SEC;
@@ -1791,6 +1817,9 @@ static void print_footer(void)
*/
int precision = get_precision(sd) + 2;
+ if (walltime_run_table)
+ print_table(output, precision, avg);
+
fprintf(output, " %17.*f +- %.*f seconds time elapsed",
precision, avg, precision, sd);
@@ -1970,6 +1999,8 @@ static const struct option stat_options[] = {
"be more verbose (show counter open errors, etc)"),
OPT_INTEGER('r', "repeat", &run_count,
"repeat command and print average + stddev (max: 100, forever: 0)"),
+ OPT_BOOLEAN(0, "table", &walltime_run_table,
+ "display details about each run (only with -r option)"),
OPT_BOOLEAN('n', "null", &null_run,
"null run - dont start any counters"),
OPT_INCR('d', "detailed", &detailed_run,
@@ -2861,6 +2892,13 @@ int cmd_stat(int argc, const char **argv)
goto out;
}
+ if (walltime_run_table && run_count <= 1) {
+ fprintf(stderr, "--table is only supported with -r\n");
+ parse_options_usage(stat_usage, stat_options, "r", 1);
+ parse_options_usage(NULL, stat_options, "table", 0);
+ goto out;
+ }
+
if (output_fd < 0) {
fprintf(stderr, "argument to --log-fd must be a > 0\n");
parse_options_usage(stat_usage, stat_options, "log-fd", 0);
@@ -2915,6 +2953,14 @@ int cmd_stat(int argc, const char **argv)
run_count = 1;
}
+ if (walltime_run_table) {
+ walltime_run = zalloc(run_count * sizeof(walltime_run[0]));
+ if (!walltime_run) {
+ pr_err("failed to setup -r option");
+ goto out;
+ }
+ }
+
if ((stat_config.aggr_mode == AGGR_THREAD) &&
!target__has_task(&target)) {
if (!target.system_wide || target.cpu_list) {
@@ -3030,7 +3076,7 @@ int cmd_stat(int argc, const char **argv)
fprintf(output, "[ perf stat: executing run #%d ... ]\n",
run_idx + 1);
- status = run_perf_stat(argc, argv);
+ status = run_perf_stat(argc, argv, run_idx);
if (forever && status != -1) {
print_counters(NULL, argc, argv);
perf_stat__reset_stats();
@@ -3078,6 +3124,8 @@ int cmd_stat(int argc, const char **argv)
perf_stat__exit_aggr_mode();
perf_evlist__free_stats(evsel_list);
out:
+ free(walltime_run);
+
if (smi_cost && smi_reset)
sysfs__write_int(FREEZE_ON_SMI_PATH, 0);
diff --git a/tools/perf/util/stat.h b/tools/perf/util/stat.h
index 8f56ba4fd258..36efb986f7fc 100644
--- a/tools/perf/util/stat.h
+++ b/tools/perf/util/stat.h
@@ -7,8 +7,7 @@
#include "xyarray.h"
#include "rblist.h"
-struct stats
-{
+struct stats {
double n, mean, M2;
u64 max, min;
};
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