Re: [Query] CPUFreq: Why do we need policy->user_policy?

["Rafael J. Wysocki" <rjw@sisk.pl>]

On Tuesday, August 27, 2013 10:04:52 PM Lan Tianyu wrote:
> 2013/8/27 Viresh Kumar <viresh.kumar@linaro.org>:
> > On 26 August 2013 20:53, Lan Tianyu <lantianyu1986@gmail.com> wrote:
> >> So far as I know, it stores some user's config and cpufreq_update_policy()
> >> bases on the data in the struct to start a new policy. Cpu thermal driver
> >> （/driver/thermal/cpu_cooling.c）also will its value to update freq policy
> >> when receive a cpufreq policy adjust notification.
> >
> > Yeah, but how are these different from policy->min/max/policy/governor?
> > Why do we need to replicate this information?
> 
> From my understanding.policy->min/max may be modified by some drivers
> but the user_policy only store user space config and should not be changed
> by other reason.  :)

Yes, that was the original idea IIRC, so separate user settings from stuff that
may be changed internally by the kernel.

Thanks,
Rafael