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). -- <http://www.linaro.org/> Linaro.org │ Open source software for ARM SoCs Follow Linaro: <http://www.facebook.com/pages/Linaro> Facebook | <http://twitter.com/#!/linaroorg> Twitter | <http://www.linaro.org/linaro-blog/> Blog