On 2/5/21 2:13 AM, Yang Yang wrote: > Hang occurs when user changes the scheduler queue depth, by writing to > the 'nr_requests' sysfs file of that device. > > The details of the environment that we found the problem are as follows: > an eMMC block device > total driver tags: 16 > default queue_depth: 32 > kqd->async_depth initialized in kyber_init_sched() with queue_depth=32 > > Then we change queue_depth to 256, by writing to the 'nr_requests' sysfs > file. But kqd->async_depth don't be updated after queue_depth changes. > Now the value of async depth is too small for queue_depth=256, this may > cause hang. > > This patch introduces kyber_depth_updated(), so that kyber can update > async depth when queue depth changes. Applied, thanks. -- Jens Axboe
