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authorJens Axboe <axboe@kernel.dk>2018-10-30 00:06:13 +0300
committerJens Axboe <axboe@kernel.dk>2018-11-07 23:44:59 +0300
commitea4f995ee8b8f0578b3319949f2edd5d812fdb0a (patch)
treef7516777fbd8b2fc16cf75b846792981c3a07434 /block/blk-mq-tag.c
parent392546aed22009060911f76b6ea24520e2f8b50f (diff)
downloadlinux-ea4f995ee8b8f0578b3319949f2edd5d812fdb0a.tar.xz
blk-mq: cache request hardware queue mapping
We call blk_mq_map_queue() a lot, at least two times for each request per IO, sometimes more. Since we now have an indirect call as well in that function. cache the mapping so we don't have to re-call blk_mq_map_queue() for the same request multiple times. Reviewed-by: Keith Busch <keith.busch@intel.com> Reviewed-by: Sagi Grimberg <sagi@grimberg.me> Reviewed-by: Hannes Reinecke <hare@suse.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-mq-tag.c')
-rw-r--r--block/blk-mq-tag.c9
1 files changed, 1 insertions, 8 deletions
diff --git a/block/blk-mq-tag.c b/block/blk-mq-tag.c
index 478a959357f5..fb836d818b80 100644
--- a/block/blk-mq-tag.c
+++ b/block/blk-mq-tag.c
@@ -527,14 +527,7 @@ int blk_mq_tag_update_depth(struct blk_mq_hw_ctx *hctx,
*/
u32 blk_mq_unique_tag(struct request *rq)
{
- struct request_queue *q = rq->q;
- struct blk_mq_hw_ctx *hctx;
- int hwq = 0;
-
- hctx = blk_mq_map_queue(q, rq->cmd_flags, rq->mq_ctx->cpu);
- hwq = hctx->queue_num;
-
- return (hwq << BLK_MQ_UNIQUE_TAG_BITS) |
+ return (rq->mq_hctx->queue_num << BLK_MQ_UNIQUE_TAG_BITS) |
(rq->tag & BLK_MQ_UNIQUE_TAG_MASK);
}
EXPORT_SYMBOL(blk_mq_unique_tag);