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

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Message-ID: <20160317113622.GS6344@twins.programming.kicks-ass.net>
Date:	Thu, 17 Mar 2016 12:36:22 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	Linux PM list <linux-pm@...r.kernel.org>,
	Juri Lelli <juri.lelli@....com>,
	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

On Thu, Mar 17, 2016 at 01:01:45AM +0100, Rafael J. Wysocki wrote:
> +	} else if (sg_policy->next_freq != next_freq) {
> +		sg_policy->work_cpu = smp_processor_id();
> +		irq_work_queue(&sg_policy->irq_work);
> +	}
> +}

> +static void sugov_irq_work(struct irq_work *irq_work)
> +{
> +	struct sugov_policy *sg_policy;
> +
> +	sg_policy = container_of(irq_work, struct sugov_policy, irq_work);
> +	schedule_work_on(sg_policy->work_cpu, &sg_policy->work);
> +}

Not sure I see the point of ->work_cpu, irq_work_queue() does guarantee
the same CPU, so the above is identical to:

	schedule_work_on(smp_processor_id(), &sq_policy->work);