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io_uring: don't put a poll req under spinlock 

Move io_put_req() in io_poll_task_handler() from under spinlock. This
eliminates the need to use REQ_F_COMP_LOCKED, at the expense of
potentially having to grab the lock again. That's still a better trade
off than relying on the locked flag.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2020-10-13 09:43:58 +01:00 committed by Jens Axboe
parent b1b74cfc19
commit 6a0af224c2
1 changed files with 1 additions and 2 deletions
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3
fs/io_uring.c
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@ -4844,10 +4844,9 @@ static void io_poll_task_handler(struct io_kiocb *req, struct io_kiocb **nxt)
hash_del(&req->hash_node);
io_poll_complete(req, req->result, 0);
req->flags |= REQ_F_COMP_LOCKED;
*nxt = io_put_req_find_next(req);
spin_unlock_irq(&ctx->completion_lock);
*nxt = io_put_req_find_next(req);
io_cqring_ev_posted(ctx);
}