[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [PATCH 02/13] cpufreq: Add perf_freq to cpuinfo

On 03.05.2021 21:27, Jason Andryuk wrote:
> acpi-cpufreq scales the aperf/mperf measurements by max_freq, but HWP
> needs to scale by base frequency.  Settings max_freq to base_freq
> "works" but the code is not obvious, and returning values to userspace
> is tricky.  Add an additonal perf_freq member which is used for scaling
> aperf/mperf measurements.
> Signed-off-by: Jason Andryuk <jandryuk@xxxxxxxxx>
> ---
> I don't like this, but it seems the best way to re-use the common
> aperf/mperf code.  The other option would be to add wrappers that then
> do the acpi vs. hwp scaling.

Not sure I understand what you mean by "wrappers". I would assume that
for hwp you simply install a different getavg hook? Or else I guess
I'd need to see at least an outline of what you see as the alternative.




Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.