int cpu_event_pinned_vs_ebb(void) { union pipe read_pipe, write_pipe; struct event event; int cpu, rc; pid_t pid; SKIP_IF(!ebb_is_supported()); cpu = pick_online_cpu(); FAIL_IF(cpu < 0); FAIL_IF(bind_to_cpu(cpu)); FAIL_IF(pipe(read_pipe.fds) == -1); FAIL_IF(pipe(write_pipe.fds) == -1); pid = fork(); if (pid == 0) { /* NB order of pipes looks reversed */ exit(ebb_child(write_pipe, read_pipe)); } /* We setup the cpu event first */ rc = setup_cpu_event(&event, cpu); if (rc) { kill_child_and_wait(pid); return rc; } /* Signal the child to install its EBB event and wait */ if (sync_with_child(read_pipe, write_pipe)) /* If it fails, wait for it to exit */ goto wait; /* Signal the child to run */ FAIL_IF(sync_with_child(read_pipe, write_pipe)); wait: /* We expect it to fail to read the event */ FAIL_IF(wait_for_child(pid) != 2); FAIL_IF(event_disable(&event)); FAIL_IF(event_read(&event)); event_report(&event); /* The cpu event should have run */ FAIL_IF(event.result.value == 0); FAIL_IF(event.result.enabled != event.result.running); return 0; }
pid_t eat_cpu(int (test_function)(void)) { union pipe read_pipe, write_pipe; int cpu, rc; pid_t pid; cpu = pick_online_cpu(); FAIL_IF(cpu < 0); FAIL_IF(bind_to_cpu(cpu)); if (pipe(read_pipe.fds) == -1) return -1; if (pipe(write_pipe.fds) == -1) return -1; pid = fork(); if (pid == 0) exit(eat_cpu_child(write_pipe, read_pipe)); if (sync_with_child(read_pipe, write_pipe)) { rc = -1; goto out; } printf("main test running as pid %d\n", getpid()); rc = test_function(); out: kill(pid, SIGKILL); return rc; }
int task_event_vs_ebb(void) { union pipe read_pipe, write_pipe; struct event event; pid_t pid; int rc; SKIP_IF(!ebb_is_supported()); FAIL_IF(pipe(read_pipe.fds) == -1); FAIL_IF(pipe(write_pipe.fds) == -1); pid = fork(); if (pid == 0) { /* NB order of pipes looks reversed */ exit(ebb_child(write_pipe, read_pipe)); } /* We setup the task event first */ rc = setup_child_event(&event, pid); if (rc) { kill_child_and_wait(pid); return rc; } /* Signal the child to install its EBB event and wait */ if (sync_with_child(read_pipe, write_pipe)) /* If it fails, wait for it to exit */ goto wait; /* Signal the child to run */ FAIL_IF(sync_with_child(read_pipe, write_pipe)); wait: /* The EBB event should push the task event off so the child should succeed */ FAIL_IF(wait_for_child(pid)); FAIL_IF(event_disable(&event)); FAIL_IF(event_read(&event)); event_report(&event); /* The task event may have run, or not so we can't assert anything about it */ return 0; }
static pthread_t create_thread_do_futex_lock_pi_with_priority(int prio) { pthread_t th4; pid_t pid; do_dm_tid_read = 0; did_dm_tid_read = 0; pthread_mutex_lock(&is_thread_desched_lock); pthread_create(&th4, 0, call_futex_lock_pi_with_priority, (void *)(long)prio); pthread_cond_wait(&is_thread_desched, &is_thread_desched_lock); pid = last_tid; sync_with_child(pid, &do_dm_tid_read, &did_dm_tid_read); pthread_mutex_unlock(&is_thread_desched_lock); return th4; }
/* Tests we can setup an EBB on our child - if it's expecting it */ int ebb_on_willing_child(void) { union pipe read_pipe, write_pipe; struct event event; pid_t pid; FAIL_IF(pipe(read_pipe.fds) == -1); FAIL_IF(pipe(write_pipe.fds) == -1); pid = fork(); if (pid == 0) { /* NB order of pipes looks reversed */ exit(victim_child(write_pipe, read_pipe)); } /* Signal the child to setup its EBB handler */ FAIL_IF(sync_with_child(read_pipe, write_pipe)); /* Child is running now */ event_init_named(&event, 0x1001e, "cycles"); event_leader_ebb_init(&event); event.attr.exclude_kernel = 1; event.attr.exclude_hv = 1; event.attr.exclude_idle = 1; FAIL_IF(event_open_with_pid(&event, pid)); FAIL_IF(ebb_event_enable(&event)); /* Child show now take EBBs and then exit */ FAIL_IF(wait_for_child(pid)); event_close(&event); return 0; }