Implement userspace RAPL bits in cpupower

Implement userspace RAPL bits in cpupower

[Thomas Renninger]

Hi,

I'd like to ask whether there already exist userspace bits
for the powercap/rapl drivers?

Afaik there is some "read-only"/monitor code in turbostat,
but it is not intended to add any modifying code in there?

I would like to avoid yet another (Intel) CPU specific
userspace tool, like:
tools/power/x86/x86_energy_perf_policy
tools/power/x86/turbostat

and it would be great if userspace bits could be added to
cpupower utility
tools/power/cpupower

I searched for rapl and powercap in the MAINTAINERS list,
but there wasn't any match. Is there a candidate (Jacob?) who
might be the right one or who volunteers for this?

Thanks for any hints and any discussion input,

      Thomas

Re: Implement userspace RAPL bits in cpupower

[Daniel Lezcano]

On 06/05/2015 04:39 PM, Thomas Renninger wrote:
> Hi,
>
> I'd like to ask whether there already exist userspace bits
> for the powercap/rapl drivers?
>
> Afaik there is some "read-only"/monitor code in turbostat,
> but it is not intended to add any modifying code in there?
>
> I would like to avoid yet another (Intel) CPU specific
> userspace tool, like:
> tools/power/x86/x86_energy_perf_policy
> tools/power/x86/turbostat
>
> and it would be great if userspace bits could be added to
> cpupower utility
> tools/power/cpupower
>
> I searched for rapl and powercap in the MAINTAINERS list,
> but there wasn't any match. Is there a candidate (Jacob?) who
> might be the right one or who volunteers for this?
>
> Thanks for any hints and any discussion input,

I began to write a small test suite using the RAPL register to measure 
the energy consumed by each test. If someone is interested by that I can 
put it somewhere in a git tree, so you can access the RAPL code.

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Re: Implement userspace RAPL bits in cpupower

[Srinivas Pandruvada]

On 06/05/2015 07:39 AM, Thomas Renninger wrote:
> Hi,
Hi,
> I'd like to ask whether there already exist userspace bits
> for the powercap/rapl drivers?
This is used in user space for Android for power saver mode and Linux 
thermal daemon,.
Also there is a powermeter at 
https://github.com/spandruvada/rapl_power_meter

>
> Afaik there is some "read-only"/monitor code in turbostat,
> but it is not intended to add any modifying code in there?
>
> I would like to avoid yet another (Intel) CPU specific
> userspace tool, like:
> tools/power/x86/x86_energy_perf_policy
> tools/power/x86/turbostat
>
> and it would be great if userspace bits could be added to
> cpupower utility
> tools/power/cpupower
> I searched for rapl and powercap in the MAINTAINERS list,
> but there wasn't any match. Is there a candidate (Jacob?) who
> might be the right one or who volunteers for this?
This is maintained by Rafael. Jacob and me are the authors/developers 
for power capping and RAPL drivers.

Thanks,
Srinivas
> Thanks for any hints and any discussion input,
>
>        Thomas
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