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blk-mq: add blk_mq_free_hctx_request() 

It's silly to use blk_mq_free_request() which in turn maps the
request to the hardware queue, for places where we already know
what the hardware queue is. This saves us an extra mapping of a
hardware queue on request completion, if the caller knows this
information already.

Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Jens Axboe 2014-11-17 10:41:57 -07:00
parent 1a3b595a28
commit 7c7f2f2bc9
2 changed files with 13 additions and 5 deletions
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17
block/blk-mq.c
View File

@ -269,16 +269,23 @@ static void __blk_mq_free_request(struct blk_mq_hw_ctx *hctx,
blk_mq_queue_exit(q);
}
void blk_mq_free_request(struct request *rq)
void blk_mq_free_hctx_request(struct blk_mq_hw_ctx *hctx, struct request *rq)
{
struct blk_mq_ctx *ctx = rq->mq_ctx;
ctx->rq_completed[rq_is_sync(rq)]++;
__blk_mq_free_request(hctx, ctx, rq);
}
EXPORT_SYMBOL_GPL(blk_mq_free_hctx_request);
void blk_mq_free_request(struct request *rq)
{
struct blk_mq_hw_ctx *hctx;
struct request_queue *q = rq->q;
ctx->rq_completed[rq_is_sync(rq)]++;
hctx = q->mq_ops->map_queue(q, ctx->cpu);
__blk_mq_free_request(hctx, ctx, rq);
hctx = q->mq_ops->map_queue(q, rq->mq_ctx->cpu);
blk_mq_free_hctx_request(hctx, rq);
}
EXPORT_SYMBOL_GPL(blk_mq_free_request);

1
include/linux/blk-mq.h
View File

@ -169,6 +169,7 @@ void blk_mq_flush_plug_list(struct blk_plug *plug, bool from_schedule);
void blk_mq_insert_request(struct request *, bool, bool, bool);
void blk_mq_run_queues(struct request_queue *q, bool async);
void blk_mq_free_request(struct request *rq);
void blk_mq_free_hctx_request(struct blk_mq_hw_ctx *, struct request *rq);
bool blk_mq_can_queue(struct blk_mq_hw_ctx *);
struct request *blk_mq_alloc_request(struct request_queue *q, int rw,
gfp_t gfp, bool reserved);