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| 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 /block/blk-mq.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 'block/blk-mq.h')
| -rw-r--r-- | block/blk-mq.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/block/blk-mq.h b/block/blk-mq.h index c4fccdeb5441..80a3f0c2bce7 100644 --- a/block/blk-mq.h +++ b/block/blk-mq.h @@ -84,7 +84,7 @@ static inline struct blk_mq_hw_ctx *blk_mq_map_queue_type(struct request_queue * enum hctx_type type, unsigned int cpu) { - return xa_load(&q->hctx_table, q->tag_set->map[type].mq_map[cpu]); + return q->queue_hw_ctx[q->tag_set->map[type].mq_map[cpu]]; } static inline enum hctx_type blk_mq_get_hctx_type(blk_opf_t opf) |