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block: blk_mq_rq_ctx_init cache ctx/q/hctx 

We should have enough of registers in blk_mq_rq_ctx_init(), store them
in local vars, so we don't keep reloading them.

note: keeping q->elevator may look unnecessary, but it's also used
inside inlined blk_mq_tags_from_data().

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2021-10-18 21:37:28 +01:00 committed by Jens Axboe
parent 4f266f2be8
commit 605f784e4f
1 changed files with 9 additions and 5 deletions
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14
block/blk-mq.c
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@ -312,10 +312,14 @@ static inline bool blk_mq_need_time_stamp(struct request *rq)
static struct request *blk_mq_rq_ctx_init(struct blk_mq_alloc_data *data,
unsigned int tag, u64 alloc_time_ns)
{
struct blk_mq_ctx *ctx = data->ctx;
struct blk_mq_hw_ctx *hctx = data->hctx;
struct request_queue *q = data->q;
struct elevator_queue *e = q->elevator;
struct blk_mq_tags *tags = blk_mq_tags_from_data(data);
struct request *rq = tags->static_rqs[tag];
if (data->q->elevator) {
if (e) {
rq->rq_flags = RQF_ELV;
rq->tag = BLK_MQ_NO_TAG;
rq->internal_tag = tag;
@ -330,13 +334,13 @@ static struct request *blk_mq_rq_ctx_init(struct blk_mq_alloc_data *data,
else
rq->start_time_ns = 0;
/* csd/requeue_work/fifo_time is initialized before use */
rq->q = data->q;
rq->mq_ctx = data->ctx;
rq->mq_hctx = data->hctx;
rq->q = q;
rq->mq_ctx = ctx;
rq->mq_hctx = hctx;
rq->cmd_flags = data->cmd_flags;
if (data->flags & BLK_MQ_REQ_PM)
rq->rq_flags |= RQF_PM;
if (blk_queue_io_stat(data->q))
if (blk_queue_io_stat(q))
rq->rq_flags |= RQF_IO_STAT;
rq->rq_disk = NULL;
rq->part = NULL;