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| author | Chengming Zhou <zhouchengming@bytedance.com> | 2023-09-13 17:16:16 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2023-09-22 16:52:13 +0200 |
| commit | d78bfa1346ab1fe04d20aa45a0678d1fc866f37c (patch) | |
| tree | 1c337a62277a41762e39fcf3e4c8cf891f1ebc42 /drivers/block | |
| parent | blk-mq: update driver tags request table when start request (diff) | |
| download | linux-d78bfa1346ab1fe04d20aa45a0678d1fc866f37c.tar.xz linux-d78bfa1346ab1fe04d20aa45a0678d1fc866f37c.zip | |
block/null_blk: add queue_rqs() support
Add batched mq_ops.queue_rqs() support in null_blk for testing. The
implementation is much easy since null_blk doesn't have commit_rqs().
We simply handle each request one by one, if errors are encountered,
leave them in the passed in list and return back.
There is about 3.6% improvement in IOPS of fio/t/io_uring on null_blk
with hw_queue_depth=256 on my test VM, from 1.09M to 1.13M.
Signed-off-by: Chengming Zhou <zhouchengming@bytedance.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20230913151616.3164338-6-chengming.zhou@linux.dev
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/block')
| -rw-r--r-- | drivers/block/null_blk/main.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/block/null_blk/main.c b/drivers/block/null_blk/main.c index 968090935eb2..79d6cd3c3d41 100644 --- a/drivers/block/null_blk/main.c +++ b/drivers/block/null_blk/main.c @@ -1750,6 +1750,25 @@ static blk_status_t null_queue_rq(struct blk_mq_hw_ctx *hctx, return null_handle_cmd(cmd, sector, nr_sectors, req_op(rq)); } +static void null_queue_rqs(struct request **rqlist) +{ + struct request *requeue_list = NULL; + struct request **requeue_lastp = &requeue_list; + struct blk_mq_queue_data bd = { }; + blk_status_t ret; + + do { + struct request *rq = rq_list_pop(rqlist); + + bd.rq = rq; + ret = null_queue_rq(rq->mq_hctx, &bd); + if (ret != BLK_STS_OK) + rq_list_add_tail(&requeue_lastp, rq); + } while (!rq_list_empty(*rqlist)); + + *rqlist = requeue_list; +} + static void cleanup_queue(struct nullb_queue *nq) { bitmap_free(nq->tag_map); @@ -1802,6 +1821,7 @@ static int null_init_hctx(struct blk_mq_hw_ctx *hctx, void *driver_data, static const struct blk_mq_ops null_mq_ops = { .queue_rq = null_queue_rq, + .queue_rqs = null_queue_rqs, .complete = null_complete_rq, .timeout = null_timeout_rq, .poll = null_poll, |