From: Ming Lei <ming.lei@redhat.com>
Date: Fri, 3 Dec 2021 16:17:03 +0800
Subject: [PATCH] block: null_blk: batched complete poll requests
Git-commit: 2385ebf38f94d4f7761b1e9a4973d04753da02c2
Patch-mainline: v5.17-rc1
References: jsc#PED-1183
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>
Acked-by: Hannes Reinecke <hare@suse.com>
---
drivers/block/null_blk/main.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/block/null_blk/main.c b/drivers/block/null_blk/main.c
index b4ff5ae1f70c..20534a2daf17 100644
--- a/drivers/block/null_blk/main.c
+++ b/drivers/block/null_blk/main.c
@@ -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++;
}
--
2.35.3