perf stat: Close cork_fd when create_perf_stat_counter() failed

When create_perf_stat_counter() failed, it doesn't close workload.cork_fd
open in evlist__prepare_workload(). This could make too many open file
error while __run_perf_stat() repeats.

Introduce evlist__cancel_workload to close workload.cork_fd and
wait workload.child_pid until exit to clear child process
when create_perf_stat_counter() is failed.

Signed-off-by: Levi Yun <yeoreum.yun@arm.com>
Reviewed-by: James Clark <james.clark@linaro.org>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Cc: nd@arm.com
Cc: howardchu95@gmail.com
Link: https://lore.kernel.org/r/20240925132022.2650180-2-yeoreum.yun@arm.com
Signed-off-by: Namhyung Kim <namhyung@kernel.org>

1 files changed, 35 insertions, 15 deletions

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 689a3d43c258..2c46bdbd9914 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -716,15 +716,19 @@ static int __run_perf_stat(int argc, const char **argv, int run_idx)
 	}
 
 	if (!cpu_map__is_dummy(evsel_list->core.user_requested_cpus)) {
-		if (affinity__setup(&saved_affinity) < 0)
-			return -1;
+		if (affinity__setup(&saved_affinity) < 0) {
+			err = -1;
+			goto err_out;
+		}
 		affinity = &saved_affinity;
 	}
 
 	evlist__for_each_entry(evsel_list, counter) {
 		counter->reset_group = false;
-		if (bpf_counter__load(counter, &target))
-			return -1;
+		if (bpf_counter__load(counter, &target)) {
+			err = -1;
+			goto err_out;
+		}
 		if (!(evsel__is_bperf(counter)))
 			all_counters_use_bpf = false;
 	}
@@ -767,7 +771,8 @@ try_again:
 
 			switch (stat_handle_error(counter)) {
 			case COUNTER_FATAL:
-				return -1;
+				err = -1;
+				goto err_out;
 			case COUNTER_RETRY:
 				goto try_again;
 			case COUNTER_SKIP:
@@ -808,7 +813,8 @@ try_again_reset:
 
 				switch (stat_handle_error(counter)) {
 				case COUNTER_FATAL:
-					return -1;
+					err = -1;
+					goto err_out;
 				case COUNTER_RETRY:
 					goto try_again_reset;
 				case COUNTER_SKIP:
@@ -833,8 +839,10 @@ try_again_reset:
 			stat_config.unit_width = l;
 
 		if (evsel__should_store_id(counter) &&
-		    evsel__store_ids(counter, evsel_list))
-			return -1;
+		    evsel__store_ids(counter, evsel_list)) {
+			err = -1;
+			goto err_out;
+		}
 	}
 
 	if (evlist__apply_filters(evsel_list, &counter, &target)) {
@@ -855,20 +863,23 @@ try_again_reset:
 		}
 
 		if (err < 0)
-			return err;
+			goto err_out;
 
 		err = perf_event__synthesize_stat_events(&stat_config, NULL, evsel_list,
 							 process_synthesized_event, is_pipe);
 		if (err < 0)
-			return err;
+			goto err_out;
+
 	}
 
 	if (target.initial_delay) {
 		pr_info(EVLIST_DISABLED_MSG);
 	} else {
 		err = enable_counters();
-		if (err)
-			return -1;
+		if (err) {
+			err = -1;
+			goto err_out;
+		}
 	}
 
 	/* Exec the command, if any */
@@ -878,8 +889,10 @@ try_again_reset:
 	if (target.initial_delay > 0) {
 		usleep(target.initial_delay * USEC_PER_MSEC);
 		err = enable_counters();
-		if (err)
-			return -1;
+		if (err) {
+			err = -1;
+			goto err_out;
+		}
 
 		pr_info(EVLIST_ENABLED_MSG);
 	}
@@ -899,7 +912,8 @@ try_again_reset:
 		if (workload_exec_errno) {
 			const char *emsg = str_error_r(workload_exec_errno, msg, sizeof(msg));
 			pr_err("Workload failed: %s\n", emsg);
-			return -1;
+			err = -1;
+			goto err_out;
 		}
 
 		if (WIFSIGNALED(status))
@@ -946,6 +960,12 @@ try_again_reset:
 		evlist__close(evsel_list);
 
 	return WEXITSTATUS(status);
+
+err_out:
+	if (forks)
+		evlist__cancel_workload(evsel_list);
+
+	return err;
 }
 
 static int run_perf_stat(int argc, const char **argv, int run_idx)