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io_uring: refactor tctx task_work list splicing

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We don't need a full copy of tctx->task_list in tctx_task_work(), but
only a first one, so just assign node directly.

Taking into account that task_works are run in a context of a task,
it's very unlikely to first see non-empty tctx->task_list and then
splice it empty, can only happen with task_work cancellations that is
not-normal slow path anyway. Hence, get rid of the check in the end,
it's there not for validity but "performance" purposes.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/d076c83fedb8253baf43acb23b8fafd7c5da1714.1623949695.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2021-06-17 18:14:08 +01:00 committed by Jens Axboe
parent ebd0df2e63
commit c6538be9e4
1 changed files with 1 additions and 6 deletions
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7
fs/io_uring.c
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@ -1897,15 +1897,13 @@ static void tctx_task_work(struct callback_head *cb)
clear_bit(0, &tctx->task_state);
while (!wq_list_empty(&tctx->task_list)) {
struct io_wq_work_list list;
struct io_wq_work_node *node;
spin_lock_irq(&tctx->task_lock);
list = tctx->task_list;
node = tctx->task_list.first;
INIT_WQ_LIST(&tctx->task_list);
spin_unlock_irq(&tctx->task_lock);
node = list.first;
while (node) {
struct io_wq_work_node *next = node->next;
struct io_kiocb *req = container_of(node, struct io_kiocb,
@ -1919,9 +1917,6 @@ static void tctx_task_work(struct callback_head *cb)
req->task_work.func(&req->task_work);
node = next;
}
if (!list.first)
break;
cond_resched();
}