diff options
| author | Fengnan Chang <fengnanchang@gmail.com> | 2025-11-28 16:53:13 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2025-11-28 09:09:19 -0700 |
| commit | d0c98769ee7d5db8d699a270690639cde1766cd4 (patch) | |
| tree | 736482908a880ed3a624edbcf4cec18c68cd044b /include/linux/blkdev.h | |
| parent | c6a45ee7607de3a350008630f4369b1b5ac80884 (diff) | |
blk-mq: use array manage hctx map instead of xarray
After commit 4e5cc99e1e48 ("blk-mq: manage hctx map via xarray"), we use
an xarray instead of array to store hctx, but in poll mode, each time
in blk_mq_poll, we need use xa_load to find corresponding hctx, this
introduce some costs. In my test, xa_load may cost 3.8% cpu.
This patch revert previous change, eliminates the overhead of xa_load
and can result in a 3% performance improvement.
Signed-off-by: Fengnan Chang <changfengnan@bytedance.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/linux/blkdev.h')
| -rw-r--r-- | include/linux/blkdev.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index cb4ba09959ee..6195f89648db 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -503,7 +503,7 @@ struct request_queue { /* hw dispatch queues */ unsigned int nr_hw_queues; - struct xarray hctx_table; + struct blk_mq_hw_ctx **queue_hw_ctx; struct percpu_ref q_usage_counter; struct lock_class_key io_lock_cls_key; |