Revert "block: inherit request start time from bio for BLK_CGROUP"

This reverts commit 0006707723233cb2a9a23ca19fc3d0864835704c. It has a
couple problems:

* bio_issue_time() is stored in bio->bi_issue truncated to 51 bits. This
  overflows in slightly over 26 days. Setting rq->io_start_time_ns with it
  means that io duration calculation would yield >26days after 26 days of
  uptime. This, for example, confuses kyber making it cause high IO
  latencies.

* rq->io_start_time_ns should record the time that the IO is issued to the
  device so that on-device latency can be measured. However,
  bio_issue_time() is set before the bio goes through the rq-qos controllers
  (wbt, iolatency, iocost), so when the bio gets throttled in any of the
  mechanisms, the measured latencies make no sense - on-device latencies end
  up higher than request-alloc-to-completion latencies.

We'll need a smarter way to avoid calling ktime_get_ns() repeatedly
back-to-back. For now, let's revert the commit.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: stable@vger.kernel.org # v5.16+
Link: https://lore.kernel.org/r/YmmeOLfo5lzc+8yI@slm.duckdns.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/block/blk-mq.c b/block/blk-mq.c
index c4370d2..84d7495 100644 (file)
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -1131,14 +1131,7 @@ void blk_mq_start_request(struct request *rq)
        trace_block_rq_issue(rq);
 
        if (test_bit(QUEUE_FLAG_STATS, &q->queue_flags)) {
-               u64 start_time;
-#ifdef CONFIG_BLK_CGROUP
-               if (rq->bio)
-                       start_time = bio_issue_time(&rq->bio->bi_issue);
-               else
-#endif
-                       start_time = ktime_get_ns();
-               rq->io_start_time_ns = start_time;
+               rq->io_start_time_ns = ktime_get_ns();
                rq->stats_sectors = blk_rq_sectors(rq);
                rq->rq_flags |= RQF_STATS;
                rq_qos_issue(q, rq);