On 10/5/19 12:59 PM, Harshad Shirwadkar wrote: > scale_up wakes up waiters after scaling up. But after scaling max, it > should not wake up more waiters as waiters will not have anything to > do. This patch fixes this by making scale_up (and also scale_down) > return when threshold is reached. > > This bug causes increased fdatasync latency when fdatasync and dd > conv=sync are performed in parallel on 4.19 compared to 4.14. This > bug was introduced during refactoring of blk-wbt code. Nice catch, thanks, applied. -- Jens Axboe
