Re: [PATCH] sched/fair: Only apply cpufreq pressure where frequency is invariant

Hello Hongyan,

On 9/9/2026 9:39 AM, Hongyan Xia wrote:

quoted

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index b898b6544069..97f4a3ba5107 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c

@@ -2586,8 +2586,11 @@ static void cpufreq_update_pressure(struct cpufreq_policy *policy)
  
  	cpu = cpumask_first(policy->related_cpus);
  	max_freq = arch_scale_freq_ref(cpu);
-	if (!max_freq)
-		max_freq = policy->cpuinfo.max_freq;
+	if (!max_freq) {
+		max_freq = __resolve_freq(policy, policy->cpuinfo.max_freq,
+					  policy->cpuinfo.min_freq, policy->cpuinfo.max_freq,
+					  CPUFREQ_RELATION_H);
+	}
  
  	capped_freq = policy->max;
  

LGTM.

Thanks a ton for taking a look at the suggestion.

NIT: I do wonder if we need a full __resolve_freq() each time. We could 
cache the highest achievable OPP on max_freq updates, but that's future 
optimization.

Sure! We can cache it in the policy object during
cpufreq_policy_online().

Jianyong Wu would like to take a stab at it? If not, I can send it out
early next week.

-- 
Thanks and Regards,
Prateek

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