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blk-mq: save queue mapping result into ctx directly

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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 <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Jianchao Wang 2019-01-24 18:25:32 +08:00 • committed by Jens Axboe
commit 8ccdf4a377
5 changed files with 9 additions and 8 deletions
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2
block/blk.h
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@ -38,7 +38,7 @@ extern struct ida blk_queue_ida;
static inline struct blk_flush_queue *
blk_get_flush_queue(struct request_queue *q, struct blk_mq_ctx *ctx)
{
return blk_mq_map_queue(q, REQ_OP_FLUSH, ctx->cpu)->fq;
return blk_mq_map_queue(q, REQ_OP_FLUSH, ctx)->fq;
}
static inline void __blk_get_queue(struct request_queue *q)