[PATCH] block: skip start/end time stamping for passthrough IO

[Kundan Kumar <kundan.kumar@xxxxxxxxxxx>]

This patch will avoid start/end time stamping for passthrough IO.
This helps to improve IO performance by ~7%

Signed-off-by: Kundan Kumar <kundan.kumar@xxxxxxxxxxx>
Signed-off-by: Kanchan Joshi <joshi.k@xxxxxxxxxxx>
---
 include/linux/blk-mq.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index 1ab3081c82ed..04617494db7e 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -830,7 +830,8 @@ void blk_mq_end_request_batch(struct io_comp_batch *ib);
  */
 static inline bool blk_mq_need_time_stamp(struct request *rq)
 {
-	return (rq->rq_flags & (RQF_IO_STAT | RQF_STATS | RQF_USE_SCHED));
+	return (rq->rq_flags & (RQF_IO_STAT | RQF_STATS | RQF_USE_SCHED) &&
+		!blk_rq_is_passthrough(rq));
 }
 
 static inline bool blk_mq_is_reserved_rq(struct request *rq)
-- 
2.25.1