while (!dt_stat_stable(s)) { \
T_STAT_MEASURE(s) { \
err = posix_spawn(&pid, args[0], NULL, NULL, args, NULL); \
} \
if (err) { \
T_FAIL("posix_spawn returned %d", err); \
} \
waitpid(pid, &status, 0); \
if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) { \
T_FAIL("Child process of posix_spawn failed to run"); \
} \
}
T_DECL(posix_spawn_platform_binary_latency, "posix_spawn platform binary latency", T_META_TYPE_PERF, T_META_CHECK_LEAKS(NO)) {
{
dt_stat_time_t s = dt_stat_time_create("time");
SPAWN_MEASURE_LOOP(s);
dt_stat_finalize(s);
}
{
dt_stat_thread_cpu_time_t s = dt_stat_thread_cpu_time_create("on-cpu time");
SPAWN_MEASURE_LOOP(s);
dt_stat_finalize(s);
}
}
#define FORK_MEASURE_LOOP(s) \
pid_t pid; \
int status; \
while (!dt_stat_stable(s)) { \
}
static void reset_kdebug_trace(void) {
_sysctl_reset();
}
static void test(const char* test_name, void (^pretest_setup)(void), void (*test)(dt_stat_time_t s)) {
T_ATEND(reset_kdebug_trace);
_sysctl_reset();
_sysctl_setbuf(1000000);
_sysctl_nowrap(false);
_sysctl_setup();
pretest_setup();
dt_stat_time_t s = dt_stat_time_create("%s", test_name);
test(s);
dt_stat_finalize(s);
}
//
// Begin tests...
//
T_DECL(kdebug_trace_baseline_syscall,
"Test the latency of a syscall while kernel tracing is disabled") {
test("kdebug_trace_baseline_syscall", ^{ enable_tracing(false); }, loop_getppid);
}
