io_uring: iterate req cache backwards
Grab requests from cache-array from the end, so can get by only
free_reqs.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/fs/io_uring.c b/fs/io_uring.c
index 1580f1e..42b45c5 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -585,8 +585,7 @@ struct io_submit_state {
* io_kiocb alloc cache
*/
void *reqs[IO_IOPOLL_BATCH];
- unsigned int free_reqs;
- unsigned int cur_req;
+ unsigned int free_reqs;
/*
* 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);
}
/*
