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io_uring: iterate req cache backwards

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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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10
fs/io_uring.c
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@@ -586,7 +586,6 @@ struct io_submit_state {
*/ */
void *reqs[IO_IOPOLL_BATCH]; void *reqs[IO_IOPOLL_BATCH];
unsigned int free_reqs; unsigned int free_reqs;
unsigned int cur_req;
/* /*
* File reference cache * File reference cache
@@ -1190,12 +1189,10 @@ static struct io_kiocb *io_get_req(struct io_ring_ctx *ctx,
ret = 1; ret = 1;
} }
state->free_reqs = ret - 1; state->free_reqs = ret - 1;
state->cur_req = 1; req = state->reqs[ret - 1];
req = state->reqs[0];
} else { } else {
req = state->reqs[state->cur_req];
state->free_reqs--; state->free_reqs--;
state->cur_req++; req = state->reqs[state->free_reqs];
} }
got_it: got_it:
@@ -4849,8 +4846,7 @@ static void io_submit_state_end(struct io_submit_state *state)
blk_finish_plug(&state->plug); blk_finish_plug(&state->plug);
io_file_put(state); io_file_put(state);
if (state->free_reqs) if (state->free_reqs)
kmem_cache_free_bulk(req_cachep, state->free_reqs, kmem_cache_free_bulk(req_cachep, state->free_reqs, state->reqs);
&state->reqs[state->cur_req]);
} }
/* /*