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SubjectRe: [PATCH v1 2/2] cpufreq: ACPI: Update arch scale-invariance max perf ratio if CPPC is not there
On Thu, Feb 04, 2021 at 06:34:32PM +0100, Rafael J. Wysocki wrote:

> arch/x86/kernel/smpboot.c | 1 +
> drivers/cpufreq/acpi-cpufreq.c | 8 ++++++++
> 2 files changed, 9 insertions(+)
>
> Index: linux-pm/drivers/cpufreq/acpi-cpufreq.c
> ===================================================================
> --- linux-pm.orig/drivers/cpufreq/acpi-cpufreq.c
> +++ linux-pm/drivers/cpufreq/acpi-cpufreq.c
> @@ -806,6 +806,14 @@ static int acpi_cpufreq_cpu_init(struct
> state_count++;
> valid_states++;
> data->first_perf_state = valid_states;
> + } else {
> + /*
> + * If the maximum "boost" frequency is unknown, ask the arch
> + * scale-invariance code to use the "nominal" performance for
> + * CPU utilization scaling so as to prevent the schedutil
> + * governor from selecting inadequate CPU frequencies.
> + */
> + arch_set_max_freq_ratio(true);
> }
>
> freq_table = kcalloc(state_count, sizeof(*freq_table), GFP_KERNEL);
> Index: linux-pm/arch/x86/kernel/smpboot.c
> ===================================================================
> --- linux-pm.orig/arch/x86/kernel/smpboot.c
> +++ linux-pm/arch/x86/kernel/smpboot.c
> @@ -1833,6 +1833,7 @@ void arch_set_max_freq_ratio(bool turbo_
> arch_max_freq_ratio = turbo_disabled ? SCHED_CAPACITY_SCALE :
> arch_turbo_freq_ratio;
> }
> +EXPORT_SYMBOL_GPL(arch_set_max_freq_ratio);

Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>

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