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blk-throttle: Avoid tracking latency if low limit is invalid 

The IO latency tracking is only for LOW limit, so we should add a
validation to avoid redundant latency tracking if the LOW limit
is not valid.

Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Baolin Wang 2020-10-08 11:52:24 +08:00 committed by Jens Axboe
parent 7901601aef
commit b185efa78b
1 changed files with 3 additions and 1 deletions
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4
block/blk-throttle.c
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@ -2100,7 +2100,7 @@ static void throtl_update_latency_buckets(struct throtl_data *td)
unsigned long last_latency[2] = { 0 };
unsigned long latency[2];
if (!blk_queue_nonrot(td->queue))
if (!blk_queue_nonrot(td->queue) || !td->limit_valid[LIMIT_LOW])
return;
if (time_before(jiffies, td->last_calculate_time + HZ))
return;
@ -2338,6 +2338,8 @@ void blk_throtl_bio_endio(struct bio *bio)
if (!blkg)
return;
tg = blkg_to_tg(blkg);
if (!tg->td->limit_valid[LIMIT_LOW])
return;
finish_time_ns = ktime_get_ns();
tg->last_finish_time = finish_time_ns >> 10;