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);
}
}
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;
}