maxcycles, duration);
}
+static __attribute__((noinline)) void perf_cost_func(void *opaque)
+{
+ qemu_coroutine_yield();
+}
+
+static void perf_cost(void)
+{
+ const unsigned long maxcycles = 40000000;
+ unsigned long i = 0;
+ double duration;
+ unsigned long ops;
+ Coroutine *co;
+
+ g_test_timer_start();
+ while (i++ < maxcycles) {
+ co = qemu_coroutine_create(perf_cost_func);
+ qemu_coroutine_enter(co, &i);
+ qemu_coroutine_enter(co, NULL);
+ }
+ duration = g_test_timer_elapsed();
+ ops = (long)(maxcycles / (duration * 1000));
+
+ g_test_message("Run operation %lu iterations %f s, %luK operations/s, "
+ "%luns per coroutine",
+ maxcycles,
+ duration, ops,
+ (unsigned long)(1000000000 * duration) / maxcycles);
+}
+
int main(int argc, char **argv)
{
g_test_init(&argc, &argv, NULL);
g_test_add_func("/perf/nesting", perf_nesting);
g_test_add_func("/perf/yield", perf_yield);
g_test_add_func("/perf/function-call", perf_baseline);
+ g_test_add_func("/perf/cost", perf_cost);
}
return g_test_run();
}