From a808a9d545cdffb964f27239d1fc0c6e2330b424 Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Wed, 13 Oct 2021 08:28:14 -0600 Subject: block: inline fast path of driver tag allocation 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 --- block/blk-mq.c | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) (limited to 'block/blk-mq.c') diff --git a/block/blk-mq.c b/block/blk-mq.c index 3481a8712234..bf5936d72de8 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -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) && -- cgit