예제 #1
0
static void create_tasks(struct perf_sched *sched)
{
	struct task_desc *task;
	pthread_attr_t attr;
	unsigned long i;
	int err;

	err = pthread_attr_init(&attr);
	BUG_ON(err);
	err = pthread_attr_setstacksize(&attr,
			(size_t) max(16 * 1024, PTHREAD_STACK_MIN));
	BUG_ON(err);
	err = pthread_mutex_lock(&sched->start_work_mutex);
	BUG_ON(err);
	err = pthread_mutex_lock(&sched->work_done_wait_mutex);
	BUG_ON(err);
	for (i = 0; i < sched->nr_tasks; i++) {
		struct sched_thread_parms *parms = malloc(sizeof(*parms));
		BUG_ON(parms == NULL);
		parms->task = task = sched->tasks[i];
		parms->sched = sched;
		parms->fd = self_open_counters(sched, i);
		sem_init(&task->sleep_sem, 0, 0);
		sem_init(&task->ready_for_work, 0, 0);
		sem_init(&task->work_done_sem, 0, 0);
		task->curr_event = 0;
		err = pthread_create(&task->thread, &attr, thread_func, parms);
		BUG_ON(err);
	}
}
예제 #2
0
static void *thread_func(void *ctx)
{
	struct sched_thread_parms *parms = ctx;
	struct task_desc *this_task = parms->task;
	struct perf_sched *sched = parms->sched;
	u64 cpu_usage_0, cpu_usage_1;
	unsigned long i, ret;
	char comm2[22];
	int fd;

	zfree(&parms);

	sprintf(comm2, ":%s", this_task->comm);
	prctl(PR_SET_NAME, comm2);
	fd = self_open_counters();
	if (fd < 0)
		return NULL;
again:
	ret = sem_post(&this_task->ready_for_work);
	BUG_ON(ret);
	ret = pthread_mutex_lock(&sched->start_work_mutex);
	BUG_ON(ret);
	ret = pthread_mutex_unlock(&sched->start_work_mutex);
	BUG_ON(ret);

	cpu_usage_0 = get_cpu_usage_nsec_self(fd);

	for (i = 0; i < this_task->nr_events; i++) {
		this_task->curr_event = i;
		perf_sched__process_event(sched, this_task->atoms[i]);
	}

	cpu_usage_1 = get_cpu_usage_nsec_self(fd);
	this_task->cpu_usage = cpu_usage_1 - cpu_usage_0;
	ret = sem_post(&this_task->work_done_sem);
	BUG_ON(ret);

	ret = pthread_mutex_lock(&sched->work_done_wait_mutex);
	BUG_ON(ret);
	ret = pthread_mutex_unlock(&sched->work_done_wait_mutex);
	BUG_ON(ret);

	goto again;
}