Commit 6c8a3134 authored by Pavel Begunkov's avatar Pavel Begunkov Committed by Jens Axboe
Browse files

io_uring: iterate req cache backwards 



Grab requests from cache-array from the end, so can get by only
free_reqs.

Signed-off-by: default avatarPavel Begunkov <asml.silence@gmail.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 3e69426d

fs/io_uring.c

+4 −8
Original line number Diff line number Diff line
@@ -586,7 +586,6 @@ struct io_submit_state { 
	 */

	void			*reqs[IO_IOPOLL_BATCH];

	unsigned int		free_reqs;

	unsigned		int cur_req;



	/*

	 * File reference cache
@@ -1190,12 +1189,10 @@ static struct io_kiocb *io_get_req(struct io_ring_ctx *ctx, 
			ret = 1;

		}

		state->free_reqs = ret - 1;

		state->cur_req = 1;

		req = state->reqs[0];

		req = state->reqs[ret - 1];

	} else {

		req = state->reqs[state->cur_req];

		state->free_reqs--;

		state->cur_req++;

		req = state->reqs[state->free_reqs];

	}



got_it:
@@ -4849,8 +4846,7 @@ static void io_submit_state_end(struct io_submit_state *state) 
	blk_finish_plug(&state->plug);

	io_file_put(state);

	if (state->free_reqs)

		kmem_cache_free_bulk(req_cachep, state->free_reqs,

					&state->reqs[state->cur_req]);

		kmem_cache_free_bulk(req_cachep, state->free_reqs, state->reqs);

}



/*