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io_uring: don't flush CQEs deep down the stack

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io_submit_flush_completions() is called down the stack in the _state
version of io_req_complete(), that's ok because is only called by
io_uring opcode handler functions directly. Move it up to
__io_queue_sqe() as preparation.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2021-01-19 13:32:46 +00:00 committed by Jens Axboe
parent a38d68db67
commit 9affd664f0
1 changed files with 10 additions and 3 deletions
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13
fs/io_uring.c
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@ -1941,8 +1941,7 @@ static void io_req_complete_state(struct io_kiocb *req, long res,
req->result = res;
req->compl.cflags = cflags;
list_add_tail(&req->compl.list, &cs->list);
if (++cs->nr >= 32)
io_submit_flush_completions(cs);
cs->nr++;
}
static inline void __io_req_complete(struct io_kiocb *req, long res,
@ -6577,7 +6576,15 @@ again:
io_queue_linked_timeout(linked_timeout);
} else if (likely(!ret)) {
/* drop submission reference */
req = io_put_req_find_next(req);
if (cs) {
io_put_req(req);
if (cs->nr >= 32)
io_submit_flush_completions(cs);
req = NULL;
} else {
req = io_put_req_find_next(req);
}
if (linked_timeout)
io_queue_linked_timeout(linked_timeout);