[lkml]   [2013]   [Feb]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH 0/4] CPUFreq: Implement per policy instances of governors
On Mon, Feb 04, 2013 at 07:28:16PM +0530, Viresh Kumar wrote:
> All files which are directly present in cpu/cpu*/cpufreq/ folder. I am
> not talking about governor tunables but policy tunables. Things like
> scaling_[min]max_freq are policy tunables.

No, on x86 those are the P-states frequencies. They're defined by the

> Policies don't have a name associated with them and so
> cpu/cpufreq/policies doesn't make any sense. Rather one policy is
> related to multiple cpus and its tunables are linked in all the cpus
> that belong to it, like scaling_[min]max_freq.

Then do the following:

|-> policy0
|-> min_freq
|-> max_freq
|-> affected_cpus

or whatever needs to be a flexible interface for multi-policy cpufreq

Remember: once you do those, they're more or less cast in stone so take
your time and do the design right, do not hurry those.

> Don't have examples of these, but there can be few. Over that it is a
> must for multicluster systems as clusters normally have separate clock
> control.

Yeah, nice try. We only support real hardware in the kernel, not what
could there be.

> But then we will get governors tunables in cpu/cpu*/cpufreq/ instead
> of cpu/cpufreq/ . Will that not break userspace for other systems?

What's wrong with having both? The cpu/cpufreq/ governor will set the
system-wide governor and the cpu/cpu*/cpufreq/ will add the different


Sent from a fat crate under my desk. Formatting is fine.

 \ /
  Last update: 2013-02-04 15:46    [W:0.287 / U:5.748 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site