diff --git a/tools/perf/Documentation/perf-stat.txt b/tools/perf/Documentation/perf-stat.txt
index cf0c3107e06e..5289da3344e9 100644
--- a/tools/perf/Documentation/perf-stat.txt
+++ b/tools/perf/Documentation/perf-stat.txt
@@ -114,6 +114,10 @@ with it. --append may be used here. Examples:
perf stat --repeat 10 --null --sync --pre 'make -s O=defconfig-build/clean' -- make -s -j64 O=defconfig-build/ bzImage
+-I msecs::
+--interval-print msecs::
+ print count deltas every N milliseconds (minimum: 100ms)
+ example: perf stat -I 1000 -e cycles -a sleep 5
EXAMPLES
--------
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 1c2ac148a7d5..493043abd164 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -65,6 +65,10 @@
#define CNTR_NOT_SUPPORTED "<not supported>"
#define CNTR_NOT_COUNTED "<not counted>"
+static void print_stat(int argc, const char **argv);
+static void print_counter_aggr(struct perf_evsel *counter, char *prefix);
+static void print_counter(struct perf_evsel *counter, char *prefix);
+
static struct perf_evlist *evsel_list;
static struct perf_target target = {
@@ -87,6 +91,8 @@ static FILE *output = NULL;
static const char *pre_cmd = NULL;
static const char *post_cmd = NULL;
static bool sync_run = false;
+static unsigned int interval = 0;
+static struct timespec ref_time;
static volatile int done = 0;
@@ -94,6 +100,28 @@ struct perf_stat {
struct stats res_stats[3];
};
+static inline void diff_timespec(struct timespec *r, struct timespec *a,
+ struct timespec *b)
+{
+ r->tv_sec = a->tv_sec - b->tv_sec;
+ if (a->tv_nsec < b->tv_nsec) {
+ r->tv_nsec = a->tv_nsec + 1000000000L - b->tv_nsec;
+ r->tv_sec--;
+ } else {
+ r->tv_nsec = a->tv_nsec - b->tv_nsec ;
+ }
+}
+
+static inline struct cpu_map *perf_evsel__cpus(struct perf_evsel *evsel)
+{
+ return (evsel->cpus && !target.cpu_list) ? evsel->cpus : evsel_list->cpus;
+}
+
+static inline int perf_evsel__nr_cpus(struct perf_evsel *evsel)
+{
+ return perf_evsel__cpus(evsel)->nr;
+}
+
static int perf_evsel__alloc_stat_priv(struct perf_evsel *evsel)
{
evsel->priv = zalloc(sizeof(struct perf_stat));
@@ -106,14 +134,27 @@ static void perf_evsel__free_stat_priv(struct perf_evsel *evsel)
evsel->priv = NULL;
}
-static inline struct cpu_map *perf_evsel__cpus(struct perf_evsel *evsel)
+static int perf_evsel__alloc_prev_raw_counts(struct perf_evsel *evsel)
{
- return (evsel->cpus && !target.cpu_list) ? evsel->cpus : evsel_list->cpus;
+ void *addr;
+ size_t sz;
+
+ sz = sizeof(*evsel->counts) +
+ (perf_evsel__nr_cpus(evsel) * sizeof(struct perf_counts_values));
+
+ addr = zalloc(sz);
+ if (!addr)
+ return -ENOMEM;
+
+ evsel->prev_raw_counts = addr;
+
+ return 0;
}
-static inline int perf_evsel__nr_cpus(struct perf_evsel *evsel)
+static void perf_evsel__free_prev_raw_counts(struct perf_evsel *evsel)
{
- return perf_evsel__cpus(evsel)->nr;
+ free(evsel->prev_raw_counts);
+ evsel->prev_raw_counts = NULL;
}
static struct stats runtime_nsecs_stats[MAX_NR_CPUS];
@@ -245,16 +286,69 @@ static int read_counter(struct perf_evsel *counter)
return 0;
}
+static void print_interval(void)
+{
+ static int num_print_interval;
+ struct perf_evsel *counter;
+ struct perf_stat *ps;
+ struct timespec ts, rs;
+ char prefix[64];
+
+ if (no_aggr) {
+ list_for_each_entry(counter, &evsel_list->entries, node) {
+ ps = counter->priv;
+ memset(ps->res_stats, 0, sizeof(ps->res_stats));
+ read_counter(counter);
+ }
+ } else {
+ list_for_each_entry(counter, &evsel_list->entries, node) {
+ ps = counter->priv;
+ memset(ps->res_stats, 0, sizeof(ps->res_stats));
+ read_counter_aggr(counter);
+ }
+ }
+ clock_gettime(CLOCK_MONOTONIC, &ts);
+ diff_timespec(&rs, &ts, &ref_time);
+ sprintf(prefix, "%6lu.%09lu%s", rs.tv_sec, rs.tv_nsec, csv_sep);
+
+ if (num_print_interval == 0 && !csv_output) {
+ if (no_aggr)
+ fprintf(output, "# time CPU counts events\n");
+ else
+ fprintf(output, "# time counts events\n");
+ }
+
+ if (++num_print_interval == 25)
+ num_print_interval = 0;
+
+ if (no_aggr) {
+ list_for_each_entry(counter, &evsel_list->entries, node)
+ print_counter(counter, prefix);
+ } else {
+ list_for_each_entry(counter, &evsel_list->entries, node)
+ print_counter_aggr(counter, prefix);
+ }
+}
+
static int __run_perf_stat(int argc __maybe_unused, const char **argv)
{
char msg[512];
unsigned long long t0, t1;
struct perf_evsel *counter;
+ struct timespec ts;
int status = 0;
int child_ready_pipe[2], go_pipe[2];
const bool forks = (argc > 0);
char buf;
+ if (interval) {
+ ts.tv_sec = interval / 1000;
+ ts.tv_nsec = (interval % 1000) * 1000000;
+ } else {
+ ts.tv_sec = 1;
+ ts.tv_nsec = 0;
+ }
+
if (forks && (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0)) {
perror("failed to create pipes");
return -1;
@@ -347,14 +441,25 @@ static int __run_perf_stat(int argc __maybe_unused, const char **argv)
* Enable counters and exec the command:
*/
t0 = rdclock();
+ clock_gettime(CLOCK_MONOTONIC, &ref_time);
if (forks) {
close(go_pipe[1]);
+ if (interval) {
+ while (!waitpid(child_pid, &status, WNOHANG)) {
+ nanosleep(&ts, NULL);
+ print_interval();
+ }
+ }
wait(&status);
if (WIFSIGNALED(status))
psignal(WTERMSIG(status), argv[0]);
} else {
- while(!done) sleep(1);
+ while (!done) {
+ nanosleep(&ts, NULL);
+ if (interval)
+ print_interval();
+ }
}
t1 = rdclock();
@@ -440,7 +545,7 @@ static void nsec_printout(int cpu, struct perf_evsel *evsel, double avg)
if (evsel->cgrp)
fprintf(output, "%s%s", csv_sep, evsel->cgrp->name);
- if (csv_output)
+ if (csv_output || interval)
return;
if (perf_evsel__match(evsel, SOFTWARE, SW_TASK_CLOCK))
@@ -654,12 +759,11 @@ static void abs_printout(int cpu, struct perf_evsel *evsel, double avg)
if (evsel->cgrp)
fprintf(output, "%s%s", csv_sep, evsel->cgrp->name);
- if (csv_output)
+ if (csv_output || interval)
return;
if (perf_evsel__match(evsel, HARDWARE, HW_INSTRUCTIONS)) {
total = avg_stats(&runtime_cycles_stats[cpu]);
-
if (total)
ratio = avg / total;
@@ -753,12 +857,15 @@ static void abs_printout(int cpu, struct perf_evsel *evsel, double avg)
* Print out the results of a single counter:
* aggregated counts in system-wide mode
*/
-static void print_counter_aggr(struct perf_evsel *counter)
+static void print_counter_aggr(struct perf_evsel *counter, char *prefix)
{
struct perf_stat *ps = counter->priv;
double avg = avg_stats(&ps->res_stats[0]);
int scaled = counter->counts->scaled;
+ if (prefix)
+ fprintf(output, "%s", prefix);
+
if (scaled == -1) {
fprintf(output, "%*s%s%*s",
csv_output ? 0 : 18,
@@ -801,7 +908,7 @@ static void print_counter_aggr(struct perf_evsel *counter)
* Print out the results of a single counter:
* does not use aggregated count in system-wide
*/
-static void print_counter(struct perf_evsel *counter)
+static void print_counter(struct perf_evsel *counter, char *prefix)
{
u64 ena, run, val;
int cpu;
@@ -810,6 +917,10 @@ static void print_counter(struct perf_evsel *counter)
val = counter->counts->cpu[cpu].val;
ena = counter->counts->cpu[cpu].ena;
run = counter->counts->cpu[cpu].run;
+
+ if (prefix)
+ fprintf(output, "%s", prefix);
+
if (run == 0 || ena == 0) {
fprintf(output, "CPU%*d%s%*s%s%*s",
csv_output ? 0 : -4,
@@ -871,10 +982,10 @@ static void print_stat(int argc, const char **argv)
if (no_aggr) {
list_for_each_entry(counter, &evsel_list->entries, node)
- print_counter(counter);
+ print_counter(counter, NULL);
} else {
list_for_each_entry(counter, &evsel_list->entries, node)
- print_counter_aggr(counter);
+ print_counter_aggr(counter, NULL);
}
if (!csv_output) {
@@ -895,7 +1006,7 @@ static volatile int signr = -1;
static void skip_signal(int signo)
{
- if(child_pid == -1)
+ if ((child_pid == -1) || interval)
done = 1;
signr = signo;
@@ -1115,6 +1226,8 @@ int cmd_stat(int argc, const char **argv, const char *prefix __maybe_unused)
"command to run prior to the measured command"),
OPT_STRING(0, "post", &post_cmd, "command",
"command to run after to the measured command"),
+ OPT_UINTEGER('I', "interval-print", &interval,
+ "print counts at regular interval in ms (>= 100)"),
OPT_END()
};
const char * const stat_usage[] = {
@@ -1215,12 +1328,23 @@ int cmd_stat(int argc, const char **argv, const char *prefix __maybe_unused)
usage_with_options(stat_usage, options);
return -1;
}
+ if (interval && interval < 100) {
+ pr_err("print interval must be >= 100ms\n");
+ usage_with_options(stat_usage, options);
+ return -1;
+ }
list_for_each_entry(pos, &evsel_list->entries, node) {
if (perf_evsel__alloc_stat_priv(pos) < 0 ||
perf_evsel__alloc_counts(pos, perf_evsel__nr_cpus(pos)) < 0)
goto out_free_fd;
}
+ if (interval) {
+ list_for_each_entry(pos, &evsel_list->entries, node) {
+ if (perf_evsel__alloc_prev_raw_counts(pos) < 0)
+ goto out_free_fd;
+ }
+ }
/*
* We dont want to block the signals - that would cause
@@ -1230,6 +1354,7 @@ int cmd_stat(int argc, const char **argv, const char *prefix __maybe_unused)
*/
atexit(sig_atexit);
signal(SIGINT, skip_signal);
+ signal(SIGCHLD, skip_signal);
signal(SIGALRM, skip_signal);
signal(SIGABRT, skip_signal);
@@ -1242,11 +1367,13 @@ int cmd_stat(int argc, const char **argv, const char *prefix __maybe_unused)
status = run_perf_stat(argc, argv);
}
- if (status != -1)
+ if (status != -1 && !interval)
print_stat(argc, argv);
out_free_fd:
- list_for_each_entry(pos, &evsel_list->entries, node)
+ list_for_each_entry(pos, &evsel_list->entries, node) {
perf_evsel__free_stat_priv(pos);
+ perf_evsel__free_prev_raw_counts(pos);
+ }
perf_evlist__delete_maps(evsel_list);
out:
perf_evlist__delete(evsel_list);