From: Kundan Kumar <kundan.kumar@xxxxxxxxxxx>
Write-back throttling (WBT) enables QUEUE_FLAG_STATS on the request
queue. But WBT does not make sense for passthrough io, so skip
QUEUE_FLAG_STATS processing.
Also skip rq_qos_issue/done for passthrough io.
Overall, the change gives ~11% hike in peak performance.
Signed-off-by: Kundan Kumar <kundan.kumar@xxxxxxxxxxx>
Signed-off-by: Kanchan Joshi <joshi.k@xxxxxxxxxxx>
---
block/blk-mq.c | 3 ++-
block/blk-rq-qos.h | 2 +-
2 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 900c1be1fee1..2de9c14dd43f 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -1248,7 +1248,8 @@ void blk_mq_start_request(struct request *rq)
trace_block_rq_issue(rq);
- if (test_bit(QUEUE_FLAG_STATS, &q->queue_flags)) {
+ if (test_bit(QUEUE_FLAG_STATS, &q->queue_flags)
+ && !blk_rq_is_passthrough(rq)) {
rq->io_start_time_ns = ktime_get_ns();
rq->stats_sectors = blk_rq_sectors(rq);
rq->rq_flags |= RQF_STATS;
diff --git a/block/blk-rq-qos.h b/block/blk-rq-qos.h
index f48ee150d667..37245c97ee61 100644
--- a/block/blk-rq-qos.h
+++ b/block/blk-rq-qos.h
@@ -118,7 +118,7 @@ static inline void rq_qos_cleanup(struct request_queue *q, struct bio *bio)
static inline void rq_qos_done(struct request_queue *q, struct request *rq)
{
- if (q->rq_qos)
+ if (q->rq_qos && !blk_rq_is_passthrough(rq))
__rq_qos_done(q->rq_qos, rq);
}
--
2.25.1
