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block: inline fast path of driver tag allocation

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If we don't use an IO scheduler or have shared tags, then we don't need
to call into this external function at all. This saves ~2% for such
a setup.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2021-10-13 08:28:14 -06:00
parent d92ca9d834
commit a808a9d545
2 changed files with 17 additions and 6 deletions
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8
block/blk-mq.c
View File

@ -1324,7 +1324,7 @@ struct request *blk_mq_dequeue_from_ctx(struct blk_mq_hw_ctx *hctx,
return data.rq;
}
static bool __blk_mq_get_driver_tag(struct request *rq)
static bool __blk_mq_alloc_driver_tag(struct request *rq)
{
struct sbitmap_queue *bt = &rq->mq_hctx->tags->bitmap_tags;
unsigned int tag_offset = rq->mq_hctx->tags->nr_reserved_tags;
@ -1348,11 +1348,9 @@ static bool __blk_mq_get_driver_tag(struct request *rq)
return true;
}
bool blk_mq_get_driver_tag(struct request *rq)
bool __blk_mq_get_driver_tag(struct blk_mq_hw_ctx *hctx, struct request *rq)
{
struct blk_mq_hw_ctx *hctx = rq->mq_hctx;
if (rq->tag == BLK_MQ_NO_TAG && !__blk_mq_get_driver_tag(rq))
if (rq->tag == BLK_MQ_NO_TAG && !__blk_mq_alloc_driver_tag(rq))
return false;
if ((hctx->flags & BLK_MQ_F_TAG_QUEUE_SHARED) &&

15
block/blk-mq.h
View File

@ -258,7 +258,20 @@ static inline void blk_mq_put_driver_tag(struct request *rq)
__blk_mq_put_driver_tag(rq->mq_hctx, rq);
}
bool blk_mq_get_driver_tag(struct request *rq);
bool __blk_mq_get_driver_tag(struct blk_mq_hw_ctx *hctx, struct request *rq);
static inline bool blk_mq_get_driver_tag(struct request *rq)
{
struct blk_mq_hw_ctx *hctx = rq->mq_hctx;
if (rq->tag != BLK_MQ_NO_TAG &&
!(hctx->flags & BLK_MQ_F_TAG_QUEUE_SHARED)) {
hctx->tags->rqs[rq->tag] = rq;
return true;
}
return __blk_mq_get_driver_tag(hctx, rq);
}
static inline void blk_mq_clear_mq_map(struct blk_mq_queue_map *qmap)
{