perf bench futex: Avoid memory leaks from pthread_attr

Remove code sharing the pthread_attr_t and initialize/destroy
pthread_attr_t when needed. This avoids the same attribute being set
that leak sanitizer reports as a memory leak.

Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: André Almeida <andrealmeid@igalia.com>
Cc: Darren Hart <dvhart@infradead.org>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20230611233610.953456-4-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 6 insertions, 6 deletions

diff --git a/tools/perf/bench/futex-requeue.c b/tools/perf/bench/futex-requeue.c
index 69ad896f556c..c0035990a33c 100644
--- a/tools/perf/bench/futex-requeue.c
+++ b/tools/perf/bench/futex-requeue.c
@@ -121,8 +121,7 @@ static void *workerfn(void *arg __maybe_unused)
 	return NULL;
 }
 
-static void block_threads(pthread_t *w,
-			  pthread_attr_t thread_attr, struct perf_cpu_map *cpu)
+static void block_threads(pthread_t *w, struct perf_cpu_map *cpu)
 {
 	cpu_set_t *cpuset;
 	unsigned int i;
@@ -137,6 +136,9 @@ static void block_threads(pthread_t *w,
 
 	/* create and block all threads */
 	for (i = 0; i < params.nthreads; i++) {
+		pthread_attr_t thread_attr;
+
+		pthread_attr_init(&thread_attr);
 		CPU_ZERO_S(size, cpuset);
 		CPU_SET_S(perf_cpu_map__cpu(cpu, i % perf_cpu_map__nr(cpu)).cpu, size, cpuset);
 
@@ -149,6 +151,7 @@ static void block_threads(pthread_t *w,
 			CPU_FREE(cpuset);
 			err(EXIT_FAILURE, "pthread_create");
 		}
+		pthread_attr_destroy(&thread_attr);
 	}
 	CPU_FREE(cpuset);
 }
@@ -165,7 +168,6 @@ int bench_futex_requeue(int argc, const char **argv)
 	int ret = 0;
 	unsigned int i, j;
 	struct sigaction act;
-	pthread_attr_t thread_attr;
 	struct perf_cpu_map *cpu;
 
 	argc = parse_options(argc, argv, options, bench_futex_requeue_usage, 0);
@@ -209,7 +211,6 @@ int bench_futex_requeue(int argc, const char **argv)
 
 	init_stats(&requeued_stats);
 	init_stats(&requeuetime_stats);
-	pthread_attr_init(&thread_attr);
 	mutex_init(&thread_lock);
 	cond_init(&thread_parent);
 	cond_init(&thread_worker);
@@ -219,7 +220,7 @@ int bench_futex_requeue(int argc, const char **argv)
 		struct timeval start, end, runtime;
 
 		/* create, launch & block all threads */
-		block_threads(worker, thread_attr, cpu);
+		block_threads(worker, cpu);
 
 		/* make sure all threads are already blocked */
 		mutex_lock(&thread_lock);
@@ -301,7 +302,6 @@ int bench_futex_requeue(int argc, const char **argv)
 	cond_destroy(&thread_parent);
 	cond_destroy(&thread_worker);
 	mutex_destroy(&thread_lock);
-	pthread_attr_destroy(&thread_attr);
 
 	print_summary();