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block: null_blk: batched complete poll requests

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Complete poll requests via blk_mq_add_to_batch() and
blk_mq_end_request_batch(), so that we can cover batched complete
code path by running null_blk test.

Meantime this way shows ~14% IOPS boost on 't/io_uring /dev/nullb0'
in my test.

Signed-off-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20211203081703.3506020-1-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Ming Lei 2021-12-03 16:17:03 +08:00 committed by Jens Axboe
parent 545a32498c
commit 2385ebf38f
1 changed files with 3 additions and 1 deletions
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4
drivers/block/null_blk/main.c
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@ -1574,7 +1574,9 @@ static int null_poll(struct blk_mq_hw_ctx *hctx, struct io_comp_batch *iob)
cmd = blk_mq_rq_to_pdu(req);
cmd->error = null_process_cmd(cmd, req_op(req), blk_rq_pos(req),
blk_rq_sectors(req));
end_cmd(cmd);
if (!blk_mq_add_to_batch(req, iob, cmd->error,
blk_mq_end_request_batch))
end_cmd(cmd);
nr++;
}