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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>
This commit is contained in:
Pavel Begunkov 2020-02-01 03:58:00 +03:00 committed by Jens Axboe
parent 3e69426da2
commit 6c8a313469
1 changed files with 4 additions and 8 deletions
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12
fs/io_uring.c
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@ -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);
}
/*