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Subject[PATCH] perf: add -o and --append options to perf stat

This patch adds an option (-o) to save the output of perf stat
into a file. You could do this with perf record but not with
perf stat. Instead, you had to fiddle with stderr to save
the counts into a separate file.

The patch also adds the --append option so that results can
be concatenated into a single file across runs. Each run of
the tool is clearly separated by a comment line starting with
a hash mark. The -A option of perf record is already used by
perf stat, so we only add a long option.

$ perf stat -o res.txt date
$ cat res.txt
# started on Mon Aug 15 19:46:55 2011


Performance counter stats for 'date':

0.791306 task-clock # 0.668 CPUs utilized
2 context-switches # 0.003 M/sec
0 CPU-migrations # 0.000 M/sec
197 page-faults # 0.249 M/sec
1878143 cycles # 2.373 GHz
<not supported> stalled-cycles-frontend
<not supported> stalled-cycles-backend
1083367 instructions # 0.58 insns per cycle
193027 branches # 243.935 M/sec
9014 branch-misses # 4.67% of all branches

0.001184746 seconds time elapsed

The option can be combined with -x to make the output file
much easier to parse.

Signed-off-by: Stephane Eranian <eranian@google.com>
---
diff --git a/tools/perf/Documentation/perf-stat.txt b/tools/perf/Documentation/perf-stat.txt
index 918cc38..08394c4 100644
--- a/tools/perf/Documentation/perf-stat.txt
+++ b/tools/perf/Documentation/perf-stat.txt
@@ -94,6 +94,13 @@ an empty cgroup (monitor all the time) using, e.g., -G foo,,bar. Cgroups must ha
corresponding events, i.e., they always refer to events defined earlier on the command
line.

+-o file::
+-output file::
+Print the output into the designated file.
+
+--append::
+Append to the output file designated with the -o option. Ignored if -o is not specified.
+
EXAMPLES
--------

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 1ad04ce..a22393d 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -193,6 +193,8 @@ static int big_num_opt = -1;
static const char *cpu_list;
static const char *csv_sep = NULL;
static bool csv_output = false;
+static const char *output_name = NULL;
+static FILE *output = NULL;

static volatile int done = 0;

@@ -351,7 +353,7 @@ static int read_counter_aggr(struct perf_evsel *counter)
update_stats(&ps->res_stats[i], count[i]);

if (verbose) {
- fprintf(stderr, "%s: %" PRIu64 " %" PRIu64 " %" PRIu64 "\n",
+ fprintf(output, "%s: %" PRIu64 " %" PRIu64 " %" PRIu64 "\n",
event_name(counter), count[0], count[1], count[2]);
}

@@ -518,9 +520,9 @@ static void print_noise_pct(double total, double avg)
pct = 100.0*total/avg;

if (csv_output)
- fprintf(stderr, "%s%.2f%%", csv_sep, pct);
+ fprintf(output, "%s%.2f%%", csv_sep, pct);
else
- fprintf(stderr, " ( +-%6.2f%% )", pct);
+ fprintf(output, " ( +-%6.2f%% )", pct);
}

static void print_noise(struct perf_evsel *evsel, double avg)
@@ -545,16 +547,17 @@ static void nsec_printout(int cpu, struct perf_evsel *evsel, double avg)
csv_output ? 0 : -4,
evsel_list->cpus->map[cpu], csv_sep);

- fprintf(stderr, fmt, cpustr, msecs, csv_sep, event_name(evsel));
+ fprintf(output, fmt, cpustr, msecs, csv_sep, event_name(evsel));

if (evsel->cgrp)
- fprintf(stderr, "%s%s", csv_sep, evsel->cgrp->name);
+ fprintf(output, "%s%s", csv_sep, evsel->cgrp->name);

if (csv_output)
return;

if (perf_evsel__match(evsel, SOFTWARE, SW_TASK_CLOCK))
- fprintf(stderr, " # %8.3f CPUs utilized ", avg / avg_stats(&walltime_nsecs_stats));
+ fprintf(output, " # %8.3f CPUs utilized ",
+ avg / avg_stats(&walltime_nsecs_stats));
}

static void print_stalled_cycles_frontend(int cpu, struct perf_evsel *evsel __used, double avg)
@@ -575,9 +578,9 @@ static void print_stalled_cycles_frontend(int cpu, struct perf_evsel *evsel __us
else if (ratio > 10.0)
color = PERF_COLOR_YELLOW;

- fprintf(stderr, " # ");
- color_fprintf(stderr, color, "%6.2f%%", ratio);
- fprintf(stderr, " frontend cycles idle ");
+ fprintf(output, " # ");
+ color_fprintf(output, color, "%6.2f%%", ratio);
+ fprintf(output, " frontend cycles idle ");
}

static void print_stalled_cycles_backend(int cpu, struct perf_evsel *evsel __used, double avg)
@@ -598,9 +601,9 @@ static void print_stalled_cycles_backend(int cpu, struct perf_evsel *evsel __use
else if (ratio > 20.0)
color = PERF_COLOR_YELLOW;

- fprintf(stderr, " # ");
- color_fprintf(stderr, color, "%6.2f%%", ratio);
- fprintf(stderr, " backend cycles idle ");
+ fprintf(output, " # ");
+ color_fprintf(output, color, "%6.2f%%", ratio);
+ fprintf(output, " backend cycles idle ");
}

static void print_branch_misses(int cpu, struct perf_evsel *evsel __used, double avg)
@@ -621,9 +624,9 @@ static void print_branch_misses(int cpu, struct perf_evsel *evsel __used, double
else if (ratio > 5.0)
color = PERF_COLOR_YELLOW;

- fprintf(stderr, " # ");
- color_fprintf(stderr, color, "%6.2f%%", ratio);
- fprintf(stderr, " of all branches ");
+ fprintf(output, " # ");
+ color_fprintf(output, color, "%6.2f%%", ratio);
+ fprintf(output, " of all branches ");
}

static void print_l1_dcache_misses(int cpu, struct perf_evsel *evsel __used, double avg)
@@ -644,9 +647,9 @@ static void print_l1_dcache_misses(int cpu, struct perf_evsel *evsel __used, dou
else if (ratio > 5.0)
color = PERF_COLOR_YELLOW;

- fprintf(stderr, " # ");
- color_fprintf(stderr, color, "%6.2f%%", ratio);
- fprintf(stderr, " of all L1-dcache hits ");
+ fprintf(output, " # ");
+ color_fprintf(output, color, "%6.2f%%", ratio);
+ fprintf(output, " of all L1-dcache hits ");
}

static void print_l1_icache_misses(int cpu, struct perf_evsel *evsel __used, double avg)
@@ -667,9 +670,9 @@ static void print_l1_icache_misses(int cpu, struct perf_evsel *evsel __used, dou
else if (ratio > 5.0)
color = PERF_COLOR_YELLOW;

- fprintf(stderr, " # ");
- color_fprintf(stderr, color, "%6.2f%%", ratio);
- fprintf(stderr, " of all L1-icache hits ");
+ fprintf(output, " # ");
+ color_fprintf(output, color, "%6.2f%%", ratio);
+ fprintf(output, " of all L1-icache hits ");
}

static void print_dtlb_cache_misses(int cpu, struct perf_evsel *evsel __used, double avg)
@@ -690,9 +693,9 @@ static void print_dtlb_cache_misses(int cpu, struct perf_evsel *evsel __used, do
else if (ratio > 5.0)
color = PERF_COLOR_YELLOW;

- fprintf(stderr, " # ");
- color_fprintf(stderr, color, "%6.2f%%", ratio);
- fprintf(stderr, " of all dTLB cache hits ");
+ fprintf(output, " # ");
+ color_fprintf(output, color, "%6.2f%%", ratio);
+ fprintf(output, " of all dTLB cache hits ");
}

static void print_itlb_cache_misses(int cpu, struct perf_evsel *evsel __used, double avg)
@@ -713,9 +716,9 @@ static void print_itlb_cache_misses(int cpu, struct perf_evsel *evsel __used, do
else if (ratio > 5.0)
color = PERF_COLOR_YELLOW;

- fprintf(stderr, " # ");
- color_fprintf(stderr, color, "%6.2f%%", ratio);
- fprintf(stderr, " of all iTLB cache hits ");
+ fprintf(output, " # ");
+ color_fprintf(output, color, "%6.2f%%", ratio);
+ fprintf(output, " of all iTLB cache hits ");
}

static void print_ll_cache_misses(int cpu, struct perf_evsel *evsel __used, double avg)
@@ -736,9 +739,9 @@ static void print_ll_cache_misses(int cpu, struct perf_evsel *evsel __used, doub
else if (ratio > 5.0)
color = PERF_COLOR_YELLOW;

- fprintf(stderr, " # ");
- color_fprintf(stderr, color, "%6.2f%%", ratio);
- fprintf(stderr, " of all LL-cache hits ");
+ fprintf(output, " # ");
+ color_fprintf(output, color, "%6.2f%%", ratio);
+ fprintf(output, " of all LL-cache hits ");
}

static void abs_printout(int cpu, struct perf_evsel *evsel, double avg)
@@ -761,10 +764,10 @@ static void abs_printout(int cpu, struct perf_evsel *evsel, double avg)
else
cpu = 0;

- fprintf(stderr, fmt, cpustr, avg, csv_sep, event_name(evsel));
+ fprintf(output, fmt, cpustr, avg, csv_sep, event_name(evsel));

if (evsel->cgrp)
- fprintf(stderr, "%s%s", csv_sep, evsel->cgrp->name);
+ fprintf(output, "%s%s", csv_sep, evsel->cgrp->name);

if (csv_output)
return;
@@ -775,14 +778,14 @@ static void abs_printout(int cpu, struct perf_evsel *evsel, double avg)
if (total)
ratio = avg / total;

- fprintf(stderr, " # %5.2f insns per cycle ", ratio);
+ fprintf(output, " # %5.2f insns per cycle ", ratio);

total = avg_stats(&runtime_stalled_cycles_front_stats[cpu]);
total = max(total, avg_stats(&runtime_stalled_cycles_back_stats[cpu]));

if (total && avg) {
ratio = total / avg;
- fprintf(stderr, "\n # %5.2f stalled cycles per insn", ratio);
+ fprintf(output, "\n # %5.2f stalled cycles per insn", ratio);
}

} else if (perf_evsel__match(evsel, HARDWARE, HW_BRANCH_MISSES) &&
@@ -830,7 +833,7 @@ static void abs_printout(int cpu, struct perf_evsel *evsel, double avg)
if (total)
ratio = avg * 100 / total;

- fprintf(stderr, " # %8.3f %% of all cache refs ", ratio);
+ fprintf(output, " # %8.3f %% of all cache refs ", ratio);

} else if (perf_evsel__match(evsel, HARDWARE, HW_STALLED_CYCLES_FRONTEND)) {
print_stalled_cycles_frontend(cpu, evsel, avg);
@@ -842,16 +845,16 @@ static void abs_printout(int cpu, struct perf_evsel *evsel, double avg)
if (total)
ratio = 1.0 * avg / total;

- fprintf(stderr, " # %8.3f GHz ", ratio);
+ fprintf(output, " # %8.3f GHz ", ratio);
} else if (runtime_nsecs_stats[cpu].n != 0) {
total = avg_stats(&runtime_nsecs_stats[cpu]);

if (total)
ratio = 1000.0 * avg / total;

- fprintf(stderr, " # %8.3f M/sec ", ratio);
+ fprintf(output, " # %8.3f M/sec ", ratio);
} else {
- fprintf(stderr, " ");
+ fprintf(output, " ");
}
}

@@ -866,7 +869,7 @@ static void print_counter_aggr(struct perf_evsel *counter)
int scaled = counter->counts->scaled;

if (scaled == -1) {
- fprintf(stderr, "%*s%s%*s",
+ fprintf(output, "%*s%s%*s",
csv_output ? 0 : 18,
counter->supported ? CNTR_NOT_COUNTED : CNTR_NOT_SUPPORTED,
csv_sep,
@@ -874,9 +877,9 @@ static void print_counter_aggr(struct perf_evsel *counter)
event_name(counter));

if (counter->cgrp)
- fprintf(stderr, "%s%s", csv_sep, counter->cgrp->name);
+ fprintf(output, "%s%s", csv_sep, counter->cgrp->name);

- fputc('\n', stderr);
+ fputc('\n', output);
return;
}

@@ -888,7 +891,7 @@ static void print_counter_aggr(struct perf_evsel *counter)
print_noise(counter, avg);

if (csv_output) {
- fputc('\n', stderr);
+ fputc('\n', output);
return;
}

@@ -898,9 +901,9 @@ static void print_counter_aggr(struct perf_evsel *counter)
avg_enabled = avg_stats(&ps->res_stats[1]);
avg_running = avg_stats(&ps->res_stats[2]);

- fprintf(stderr, " [%5.2f%%]", 100 * avg_running / avg_enabled);
+ fprintf(output, " [%5.2f%%]", 100 * avg_running / avg_enabled);
}
- fprintf(stderr, "\n");
+ fprintf(output, "\n");
}

/*
@@ -917,7 +920,7 @@ static void print_counter(struct perf_evsel *counter)
ena = counter->counts->cpu[cpu].ena;
run = counter->counts->cpu[cpu].run;
if (run == 0 || ena == 0) {
- fprintf(stderr, "CPU%*d%s%*s%s%*s",
+ fprintf(output, "CPU%*d%s%*s%s%*s",
csv_output ? 0 : -4,
evsel_list->cpus->map[cpu], csv_sep,
csv_output ? 0 : 18,
@@ -927,9 +930,10 @@ static void print_counter(struct perf_evsel *counter)
event_name(counter));

if (counter->cgrp)
- fprintf(stderr, "%s%s", csv_sep, counter->cgrp->name);
+ fprintf(output, "%s%s",
+ csv_sep, counter->cgrp->name);

- fputc('\n', stderr);
+ fputc('\n', output);
continue;
}

@@ -942,9 +946,10 @@ static void print_counter(struct perf_evsel *counter)
print_noise(counter, 1.0);

if (run != ena)
- fprintf(stderr, " (%.2f%%)", 100.0 * run / ena);
+ fprintf(output, " (%.2f%%)",
+ 100.0 * run / ena);
}
- fputc('\n', stderr);
+ fputc('\n', output);
}
}

@@ -956,21 +961,21 @@ static void print_stat(int argc, const char **argv)
fflush(stdout);

if (!csv_output) {
- fprintf(stderr, "\n");
- fprintf(stderr, " Performance counter stats for ");
+ fprintf(output, "\n");
+ fprintf(output, " Performance counter stats for ");
if(target_pid == -1 && target_tid == -1) {
- fprintf(stderr, "\'%s", argv[0]);
+ fprintf(output, "\'%s", argv[0]);
for (i = 1; i < argc; i++)
- fprintf(stderr, " %s", argv[i]);
+ fprintf(output, " %s", argv[i]);
} else if (target_pid != -1)
- fprintf(stderr, "process id \'%d", target_pid);
+ fprintf(output, "process id \'%d", target_pid);
else
- fprintf(stderr, "thread id \'%d", target_tid);
+ fprintf(output, "thread id \'%d", target_tid);

- fprintf(stderr, "\'");
+ fprintf(output, "\'");
if (run_count > 1)
- fprintf(stderr, " (%d runs)", run_count);
- fprintf(stderr, ":\n\n");
+ fprintf(output, " (%d runs)", run_count);
+ fprintf(output, ":\n\n");
}

if (no_aggr) {
@@ -983,15 +988,15 @@ static void print_stat(int argc, const char **argv)

if (!csv_output) {
if (!null_run)
- fprintf(stderr, "\n");
- fprintf(stderr, " %17.9f seconds time elapsed",
+ fprintf(output, "\n");
+ fprintf(output, " %17.9f seconds time elapsed",
avg_stats(&walltime_nsecs_stats)/1e9);
if (run_count > 1) {
- fprintf(stderr, " ");
+ fprintf(output, " ");
print_noise_pct(stddev_stats(&walltime_nsecs_stats),
avg_stats(&walltime_nsecs_stats));
}
- fprintf(stderr, "\n\n");
+ fprintf(output, "\n\n");
}
}

@@ -1029,6 +1034,8 @@ static int stat__set_big_num(const struct option *opt __used,
return 0;
}

+static bool append_file;
+
static const struct option options[] = {
OPT_CALLBACK('e', "event", &evsel_list, "event",
"event selector. use 'perf list' to list available events",
@@ -1067,6 +1074,9 @@ static const struct option options[] = {
OPT_CALLBACK('G', "cgroup", &evsel_list, "name",
"monitor event in cgroup name only",
parse_cgroups),
+ OPT_STRING('o', "output", &output_name, "file",
+ "output file name"),
+ OPT_BOOLEAN(0, "append", &append_file, "append to the output file"),
OPT_END()
};

@@ -1138,6 +1148,7 @@ int cmd_stat(int argc, const char **argv, const char *prefix __used)
{
struct perf_evsel *pos;
int status = -ENOMEM;
+ const char *mode;

setlocale(LC_ALL, "");

@@ -1148,6 +1159,23 @@ int cmd_stat(int argc, const char **argv, const char *prefix __used)
argc = parse_options(argc, argv, options, stat_usage,
PARSE_OPT_STOP_AT_NON_OPTION);

+ output = stderr;
+ if (output_name && strcmp(output_name, "-"))
+ output = NULL;
+
+ if (!output) {
+ struct timespec tm;
+ mode = append_file ? "a" : "w";
+
+ output = fopen(output_name, mode);
+ if (!output) {
+ perror("failed to create output file");
+ exit(-1);
+ }
+ clock_gettime(CLOCK_REALTIME, &tm);
+ fprintf(output, "# started on %s\n", ctime(&tm.tv_sec));
+ }
+
if (csv_sep)
csv_output = true;
else
@@ -1223,7 +1251,8 @@ int cmd_stat(int argc, const char **argv, const char *prefix __used)
status = 0;
for (run_idx = 0; run_idx < run_count; run_idx++) {
if (run_count != 1 && verbose)
- fprintf(stderr, "[ perf stat: executing run #%d ... ]\n", run_idx + 1);
+ fprintf(output, "[ perf stat: executing run #%d ... ]\n",
+ run_idx + 1);

if (sync_run)
sync();
diff --git a/tools/perf/util/color.c b/tools/perf/util/color.c
index e191eb9..521c38a 100644
--- a/tools/perf/util/color.c
+++ b/tools/perf/util/color.c
@@ -200,7 +200,7 @@ static int __color_vfprintf(FILE *fp, const char *color, const char *fmt,
* Auto-detect:
*/
if (perf_use_color_default < 0) {
- if (isatty(1) || pager_in_use())
+ if (isatty(fileno(fp)) || pager_in_use())
perf_use_color_default = 1;
else
perf_use_color_default = 0;

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