On 2022/2/23 1:19 上午, Tejun Heo wrote: > Hello, > > On Thu, Feb 17, 2022 at 11:13:44AM +0800, Wang Jianchao (Kuaishou) wrote: >> (3) Add /sys/block/x/queue/qos >> We can use '+name' or "-name" to open or close the blk-rq-qos >> policy. > > I don't understand why we're modularizing rq-qos in this non-standard way > instead of modprobing to enable a policy and rmmoding to disable. Why are we > building in qos names into the kernel and adding an extra module handling > interface? Hi Tejun We just want to provide the flexibility for the user to open/close a policy per device. If we need to the policy on a device, we needn't to waste cpu cycles and memory for it. Thanks Jianchao
