linux-kernel - Re: [PATCH 1/2] cpufreq_schedutil: Refactor sugov_cpu_is

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Date: Wed, 19 Jun 2024 08:57:56 -1000
From: Tejun Heo <tj@...nel.org>
To: Christian Loehle <christian.loehle@....com>
Cc: rafael@...nel.org, viresh.kumar@...aro.org, linux-pm@...r.kernel.org,
	void@...ifault.com, linux-kernel@...r.kernel.org,
	kernel-team@...a.com, mingo@...hat.com, peterz@...radead.org,
	David Vernet <dvernet@...a.com>,
	"Rafael J . Wysocki" <rafael.j.wysocki@...el.com>
Subject: Re: [PATCH 1/2] cpufreq_schedutil: Refactor sugov_cpu_is_busy()

Hello, Christian.

On Wed, Jun 19, 2024 at 03:07:32PM +0100, Christian Loehle wrote:
> > +	if (sugov_hold_freq(sg_cpu) && next_f < sg_policy->next_freq &&
> >  	    !sg_policy->need_freq_update) {
> >  		next_f = sg_policy->next_freq;
> >  
> 
> Not necessarily related to your changes, but in case you're touching this
> again, maybe sugov_hold_freq() could be the last condition?

I'll update the patch so that sugov_hold_freq() is the last condition.

> And do we want something like
> #ifdef CONFIG_NO_HZ_COMMON                                                      
> else
> 	sg_cpu->saved_idle_calls = tick_nohz_get_idle_calls_cpu(sg_cpu->cpu);
> #endif
> here?

I have no idea but if something like the above is necessary, it'd probably
fit better in the #else definition of sugof_hold_freq() or just move the
#ifdef inside the function body so that the common part is outside?

Thanks.

-- 
tejun