PM QoS: Interface design question

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Hi,

I am curious about an aspect of the design of PM QoS.

While working with the devices provided to configure PM QoS it struck me
that this is a rather unusual interface - holding a file descriptor to a
device open so long as configuration parameters apply.  I understand that
this is a mechanism to apply parameters on a per-task basis.  But I am
wondering if any consideration was given to using cgroups, which seem to me
to be designed specifically for applying QoS parameters on a per-task
basis.
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