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io_uring: allow IO worker threads to be frozen

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With the freezer using the proper signaling to notify us of when it's
time to freeze a thread, we can re-enable normal freezer usage for the
IO threads. Ensure that SQPOLL, io-wq, and the io-wq manager call
try_to_freeze() appropriately, and remove the default setting of
PF_NOFREEZE from create_io_thread().

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2021-03-12 20:26:13 -07:00
parent 15b2219fac
commit 16efa4fce3
3 changed files with 6 additions and 2 deletions
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6
fs/io-wq.c
View file

@ -488,6 +488,8 @@ static int io_wqe_worker(void *data)
set_task_comm(current, buf);
while (!test_bit(IO_WQ_BIT_EXIT, &wq->state)) {
long ret;
set_current_state(TASK_INTERRUPTIBLE);
loop:
raw_spin_lock_irq(&wqe->lock);
@ -498,7 +500,8 @@ static int io_wqe_worker(void *data)
__io_worker_idle(wqe, worker);
raw_spin_unlock_irq(&wqe->lock);
io_flush_signals();
if (schedule_timeout(WORKER_IDLE_TIMEOUT))
ret = schedule_timeout(WORKER_IDLE_TIMEOUT);
if (try_to_freeze() || ret)
continue;
if (fatal_signal_pending(current))
break;
@ -709,6 +712,7 @@ static int io_wq_manager(void *data)
set_current_state(TASK_INTERRUPTIBLE);
io_wq_check_workers(wq);
schedule_timeout(HZ);
try_to_freeze();
if (fatal_signal_pending(current))
set_bit(IO_WQ_BIT_EXIT, &wq->state);
} while (!test_bit(IO_WQ_BIT_EXIT, &wq->state));

1
fs/io_uring.c
View file

@ -6752,6 +6752,7 @@ static int io_sq_thread(void *data)
up_read(&sqd->rw_lock);
schedule();
try_to_freeze();
down_read(&sqd->rw_lock);
list_for_each_entry(ctx, &sqd->ctx_list, sqd_list)
io_ring_clear_wakeup_flag(ctx);

1
kernel/fork.c
View file

@ -2436,7 +2436,6 @@ struct task_struct *create_io_thread(int (*fn)(void *), void *arg, int node)
if (!IS_ERR(tsk)) {
sigfillset(&tsk->blocked);
sigdelsetmask(&tsk->blocked, sigmask(SIGKILL));
tsk->flags |= PF_NOFREEZE;
}
return tsk;
}