linux-kernel - Re: [PATCH v5 7/7][Update] cpufreq: schedutil: New governor based on scheduler utilization data

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Date:	Thu, 17 Mar 2016 11:30:54 +0000
From:	Juri Lelli <juri.lelli@....com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	Linux PM list <linux-pm@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Steve Muckle <steve.muckle@...aro.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Michael Turquette <mturquette@...libre.com>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH v5 7/7][Update] cpufreq: schedutil: New governor based on
 scheduler utilization data

Hi Rafael,

On 17/03/16 01:01, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

[...]

> +static void sugov_update_commit(struct sugov_policy *sg_policy, u64 time,
> +				unsigned int next_freq)
> +{
> +	struct cpufreq_policy *policy = sg_policy->policy;
> +
> +	sg_policy->last_freq_update_time = time;
> +
> +	if (policy->fast_switch_enabled) {
> +		if (next_freq > policy->max)
> +			next_freq = policy->max;
> +		else if (next_freq < policy->min)
> +			next_freq = policy->min;
> +
> +		if (sg_policy->next_freq == next_freq) {
> +			trace_cpu_frequency(policy->cur, smp_processor_id());
> +			return;
> +		}
> +		sg_policy->next_freq = next_freq;
> +		next_freq = cpufreq_driver_fast_switch(policy, next_freq);
> +		if (next_freq == CPUFREQ_ENTRY_INVALID)
> +			return;
> +
> +		policy->cur = next_freq;
> +		trace_cpu_frequency(next_freq, smp_processor_id());
> +	} else if (sg_policy->next_freq != next_freq) {
> +		sg_policy->work_cpu = smp_processor_id();

  +		sg_policy->next_freq = next_freq;

> +		irq_work_queue(&sg_policy->irq_work);
> +	}
> +}

Or we remain at max_f :-).

Best,

- Juri