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| author | Jianchao Wang <jianchao.w.wang@oracle.com> | 2019-01-24 18:25:32 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2019-02-01 08:33:04 -0700 |
| commit | 8ccdf4a3775229314c8bd365ac88c2cbdf36be13 (patch) | |
| tree | 8b6c6835912bb3f3076d6694ba264072ae5921b6 /block/blk-mq.h | |
| parent | 058fdecc6de7cdecbf4c59b851e80eb2d6c5295f (diff) | |
| download | linux-8ccdf4a3775229314c8bd365ac88c2cbdf36be13.tar.bz2 | |
blk-mq: save queue mapping result into ctx directly
Currently, the queue mapping result is saved in a two-dimensional
array. In the hot path, to get a hctx, we need do following:
q->queue_hw_ctx[q->tag_set->map[type].mq_map[cpu]]
This isn't very efficient. We could save the queue mapping result into
ctx directly with different hctx type, like,
ctx->hctxs[type]
Signed-off-by: Jianchao Wang <jianchao.w.wang@oracle.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-mq.h')
| -rw-r--r-- | block/blk-mq.h | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/block/blk-mq.h b/block/blk-mq.h index d943d46b0785..9fb06261518e 100644 --- a/block/blk-mq.h +++ b/block/blk-mq.h @@ -23,6 +23,7 @@ struct blk_mq_ctx { unsigned int cpu; unsigned short index_hw[HCTX_MAX_TYPES]; + struct blk_mq_hw_ctx *hctxs[HCTX_MAX_TYPES]; /* incremented at dispatch time */ unsigned long rq_dispatched[2]; @@ -97,11 +98,11 @@ static inline struct blk_mq_hw_ctx *blk_mq_map_queue_type(struct request_queue * * blk_mq_map_queue() - map (cmd_flags,type) to hardware queue * @q: request queue * @flags: request command flags - * @cpu: CPU + * @cpu: cpu ctx */ static inline struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *q, unsigned int flags, - unsigned int cpu) + struct blk_mq_ctx *ctx) { enum hctx_type type = HCTX_TYPE_DEFAULT; @@ -116,7 +117,7 @@ static inline struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *q, q->tag_set->map[HCTX_TYPE_READ].nr_queues) type = HCTX_TYPE_READ; - return blk_mq_map_queue_type(q, type, cpu); + return ctx->hctxs[type]; } /* |