Entering tctx_task_work() with empty task_list is a strange scenario,
that can happen only on rare occasion during task exit, so let's not
check for task_list emptiness in advance and do it do-while style. The
code still correct for the empty case, just would do extra work about
which we don't care.
Do extra step and do the check before cond_resched(), so we don't
resched if have nothing to execute.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/c4173e288e69793d03c7d7ce826f9d28afba718a.1623949695.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
clear_bit(0, &tctx->task_state);
- while (!wq_list_empty(&tctx->task_list)) {
+ while (1) {
struct io_wq_work_node *node;
spin_lock_irq(&tctx->task_lock);
req->task_work.func(&req->task_work);
node = next;
}
+ if (wq_list_empty(&tctx->task_list))
+ break;
cond_resched();
}