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    SubjectRe: [PATCH V6] powercap/drivers/idle_injection: Add an idle injection framework
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    On 13/06/2018 17:54, Pandruvada, Srinivas wrote:
    > On Tue, 2018-06-12 at 14:00 +0200, Daniel Lezcano wrote:
    >> Initially, the cpu_cooling device for ARM was changed by adding a new
    >> policy inserting idle cycles. The intel_powerclamp driver does a
    >> similar action.
    >>
    >> Instead of implementing idle injections privately in the cpu_cooling
    >> device, move the idle injection code in a dedicated framework and
    >> give
    >> the opportunity to other frameworks to make use of it.
    >>
    >> The framework relies on the smpboot kthreads which handles via its
    >> main loop the common code for hotplugging and [un]parking.
    >>
    >> This code was previously tested with the cpu cooling device and went
    >> through several iterations. It results now in split code and API
    >> exported in the header file. It was tested with the cpu cooling
    >> device
    >> with success.
    >>
    > May be I have missed, but I don't see any use of powercap sysfs.
    >
    > We created powercap sys that user space is presented a common interface
    > for power capping. The RAPL driver was also submitted as cooling device
    > before, but suggestion was to create this powercap.
    >
    > So if powercap interface is not enough then may be we should enhance
    > that.

    We are creating a framework for idle injection. This framework can then
    be used by the cpu_cooling device, the power_clamp and in addition a
    power capping for ARM (if it makes sense).



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