We call blk_mq_map_queue() a lot, at least two times for each request per IO, sometimes more. Since we now have an indirect call as well in that function. cache the mapping so we don't have to re-call blk_mq_map_queue() for the same request multiple times.
Showing the changes to include/linux/blkdev.h (1 of 7 files). Show all
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| @@ -129,6 +129,7 @@ enum mq_rq_state { · 128 unmodified lines | ||
| 129 | 129 | struct request { |
| 130 | 130 | struct request_queue *q; |
| 131 | 131 | struct blk_mq_ctx *mq_ctx; |
| 132 | + struct blk_mq_hw_ctx *mq_hctx; | |
| 132 | 133 | |
| 133 | 134 | unsigned int cmd_flags; /* op and common flags */ |
| 134 | 135 | req_flags_t rq_flags; |