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Re: [PATCH v2 02/13] cpufreq: Add perf_freq to cpuinfo
- To: Jason Andryuk <jandryuk@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 15 Aug 2022 16:29:32 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 15 Aug 2022 14:29:40 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 10.08.2022 21:29, 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.
I think that's okay-ish, so
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
Jan
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