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SubjectRe: [PATCH] PM / devfreq: Generic cpufreq governor
On 2018-07-29 03:52, Rafael J. Wysocki wrote:
> On Sat, Jul 28, 2018 at 5:56 AM, Saravana Kannan
> <> wrote:
>> Many CPU architectures have caches that can scale independent of the
>> CPUs.
>> Frequency scaling of the caches is necessary to make sure the cache is
>> not
>> a performance bottleneck that leads to poor performance and power. The
>> same
>> idea applies for RAM/DDR.
>> To achieve this, this patch adds a generic devfreq governor that can
>> listen
>> to the frequency transitions of each CPU frequency domain and then
>> adjusts
>> the frequency of the cache (or any devfreq device) based on the
>> frequency
>> of the CPUs.
>> To decide the frequency of the device, the governor does one of the
>> following:
>> * Uses a CPU frequency to device frequency mapping table
>> - Either one mapping table used for all CPU freq policies (typically
>> used
>> for system with homogeneous cores/clusters that have the same
>> OPPs.
>> - One mapping table per CPU freq policy (typically used for ASMP
>> systems
>> with heterogeneous CPUs with different OPPs)
>> OR
>> * Scales the device frequency in proportion to the CPU frequency. So,
>> if
>> the CPUs are running at their max frequency, the device runs at its
>> max
>> frequency. If the CPUs are running at their min frequency, the
>> device
>> runs at its min frequency. And interpolated for frequencies in
>> between.
> While not having looked at the details of the patch yet, I would
> change the name of the feature to "Generic cpufreq transition
> governor" to make it somewhat less ambiguous.

In my opinion it makes it look MORE like this is a cpufreq governor. How
about the following?
PM / devfreq: Generic cpufreq to devfreq mapping governor
Seem a lot more clear to me.

I'm open to suggestions for the devfreq governor name too. "cpufreq" has
been very confusing so far.
cpufreq-map maybe?


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