perf stat: Add support for --initial-delay option

[platform/adaptation/renesas_rcar/renesas_kernel.git] / tools / perf / builtin-stat.c

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 352fbd7..2e637e4 100644 (file)
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -100,6 +100,7 @@ static const char           *pre_cmd                        = NULL;
 static const char              *post_cmd                       = NULL;
 static bool                    sync_run                        = false;
 static unsigned int            interval                        = 0;
+static unsigned int            initial_delay                   = 0;
 static bool                    forever                         = false;
 static struct timespec         ref_time;
 static struct cpu_map          *aggr_map;
@@ -254,7 +255,8 @@ static int create_perf_stat_counter(struct perf_evsel *evsel)
        if (!perf_target__has_task(&target) &&
            perf_evsel__is_group_leader(evsel)) {
                attr->disabled = 1;
-               attr->enable_on_exec = 1;
+               if (!initial_delay)
+                       attr->enable_on_exec = 1;
        }
 
        return perf_evsel__open_per_thread(evsel, evsel_list->threads);
@@ -416,6 +418,20 @@ static void print_interval(void)
        }
 }
 
+static void handle_initial_delay(void)
+{
+       struct perf_evsel *counter;
+
+       if (initial_delay) {
+               const int ncpus = cpu_map__nr(evsel_list->cpus),
+                       nthreads = thread_map__nr(evsel_list->threads);
+
+               usleep(initial_delay * 1000);
+               list_for_each_entry(counter, &evsel_list->entries, node)
+                       perf_evsel__enable(counter, ncpus, nthreads);
+       }
+}
+
 static int __run_perf_stat(int argc, const char **argv)
 {
        char msg[512];
@@ -486,6 +502,7 @@ static int __run_perf_stat(int argc, const char **argv)
 
        if (forks) {
                perf_evlist__start_workload(evsel_list);
+               handle_initial_delay();
 
                if (interval) {
                        while (!waitpid(child_pid, &status, WNOHANG)) {
@@ -497,6 +514,7 @@ static int __run_perf_stat(int argc, const char **argv)
                if (WIFSIGNALED(status))
                        psignal(WTERMSIG(status), argv[0]);
        } else {
+               handle_initial_delay();
                while (!done) {
                        nanosleep(&ts, NULL);
                        if (interval)
@@ -1419,6 +1437,8 @@ int cmd_stat(int argc, const char **argv, const char *prefix __maybe_unused)
                     "aggregate counts per processor socket", AGGR_SOCKET),
        OPT_SET_UINT(0, "per-core", &aggr_mode,
                     "aggregate counts per physical processor core", AGGR_CORE),
+       OPT_UINTEGER('D', "delay", &initial_delay,
+                    "ms to wait before starting measurement after program start"),
        OPT_END()
        };
        const char * const stat_usage[] = {