Re: [PATCH block-5.14] Revert "block/mq-deadline: Add cgroup support"

On 8/13/21 9:29 AM, Tejun Heo wrote:

The problem with complex optional hardware features is often the
accompanying variability in terms of availability, reliability and
behavior. The track record has been pretty sad. That isn't to say this
won't be useful for anybody but it'd need careful coordination in
terms of picking hardware vendor and model and ensuring vendor
support, which kinda severely limits the usefulness.

I think the above view is too negative. Companies that store large 
amounts of data have the power to make this happen by only buying 
storage devices that support I/O prioritization well enough.

Bart.