[PATCH v2 03/11] perf stat: factor out event handling loop into a function

Alexey Budankov
2020-05-06T18:20:10Z

Factor out event handling loop into handle_events() function.

Signed-off-by: Alexey Budankov <alexey.budankov@linux.intel.com>
---
tools/perf/builtin-stat.c | 85 +++++++++++++++++++++++----------------
1 file changed, 50 insertions(+), 35 deletions(-)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index e0c1ad23c768..9775b0905146 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -371,6 +371,16 @@ static void process_interval(void)
print_counters(&rs, 0, NULL);
}

+static bool print_interval_and_stop(struct perf_stat_config *config, int *times)
+{
+ if (config->interval) {
+ process_interval();
+ if (interval_count && !(--(*times)))
+ return true;
+ }
+ return false;
+}
+
static void enable_counters(void)
{
if (stat_config.initial_delay)
@@ -436,6 +446,42 @@ static bool is_target_alive(struct target *_target,
return false;
}

+static int handle_events(pid_t pid, struct perf_stat_config *config)
+{
+ pid_t child = 0;
+ bool res, stop = false;
+ struct timespec time_to_sleep;
+ int sleep_time, status = 0, times = config->times;
+
+ if (config->interval)
+ sleep_time = config->interval;
+ else if (config->timeout)
+ sleep_time = config->timeout;
+ else
+ sleep_time = 1000;
+
+ time_to_sleep.tv_sec = sleep_time / MSEC_PER_SEC;
+ time_to_sleep.tv_nsec = (sleep_time % MSEC_PER_SEC) * NSEC_PER_MSEC;
+
+ do {
+ if (pid != -1)
+ child = waitpid(pid, &status, WNOHANG);
+ if (child || stop || done)
+ break;
+ nanosleep(&time_to_sleep, NULL);
+ if (pid == -1)
+ stop = !is_target_alive(&target, evsel_list->core.threads);
+ if (config->timeout) {
+ stop = !stop ? true : stop;
+ } else {
+ res = print_interval_and_stop(config, &times);
+ stop = !stop ? res : stop;
+ }
+ } while (1);
+
+ return status;
+}
+
enum counter_recovery {
COUNTER_SKIP,
COUNTER_RETRY,
@@ -494,12 +540,10 @@ static enum counter_recovery stat_handle_error(struct evsel *counter)
static int __run_perf_stat(int argc, const char **argv, int run_idx)
{
int interval = stat_config.interval;
- int times = stat_config.times;
int timeout = stat_config.timeout;
char msg[BUFSIZ];
unsigned long long t0, t1;
struct evsel *counter;
- struct timespec ts;
size_t l;
int status = 0;
const bool forks = (argc > 0);
@@ -508,17 +552,6 @@ static int __run_perf_stat(int argc, const char **argv, int run_idx)
int i, cpu;
bool second_pass = false;

- if (interval) {
- ts.tv_sec = interval / USEC_PER_MSEC;
- ts.tv_nsec = (interval % USEC_PER_MSEC) * NSEC_PER_MSEC;
- } else if (timeout) {
- ts.tv_sec = timeout / USEC_PER_MSEC;
- ts.tv_nsec = (timeout % USEC_PER_MSEC) * NSEC_PER_MSEC;
- } else {
- ts.tv_sec = 1;
- ts.tv_nsec = 0;
- }
-
if (forks) {
if (perf_evlist__prepare_workload(evsel_list, &target, argv, is_pipe,
workload_exec_failed_signal) < 0) {
@@ -675,16 +708,9 @@ static int __run_perf_stat(int argc, const char **argv, int run_idx)
perf_evlist__start_workload(evsel_list);
enable_counters();

- if (interval || timeout) {
- while (!waitpid(child_pid, &status, WNOHANG)) {
- nanosleep(&ts, NULL);
- if (timeout)
- break;
- process_interval();
- if (interval_count && !(--times))
- break;
- }
- }
+ if (interval || timeout)
+ handle_events(child_pid, &stat_config);
+
if (child_pid != -1) {
if (timeout)
kill(child_pid, SIGTERM);
@@ -701,18 +727,7 @@ static int __run_perf_stat(int argc, const char **argv, int run_idx)
psignal(WTERMSIG(status), argv[0]);
} else {
enable_counters();
- while (!done) {
- nanosleep(&ts, NULL);
- if (!is_target_alive(&target, evsel_list->core.threads))
- break;
- if (timeout)
- break;
- if (interval) {
- process_interval();
- if (interval_count && !(--times))
- break;
- }
- }
+ handle_events(-1, &stat_config);
}

disable_counters();
--
2.24.1