linux-kernel - Re: [PATCH v1 5/7] thermal: add trace events to the power allocator governor

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Message-ID: <20150128123106.05e28afc@gandalf.local.home>
Date:	Wed, 28 Jan 2015 12:31:06 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Javi Merino <javi.merino@....com>
Cc:	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
	punit.agrawal@....com, broonie@...nel.org,
	Zhang Rui <rui.zhang@...el.com>,
	Eduardo Valentin <edubezval@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH v1 5/7] thermal: add trace events to the power allocator
 governor

On Wed, 28 Jan 2015 17:00:36 +0000
Javi Merino <javi.merino@....com> wrote:

> +	if (trace_thermal_power_cpu_limit_enabled() && load_cpu) {
> +		trace_thermal_power_cpu_get_power(
> +			&cpufreq_device->allowed_cpus,
> +			freq, load_cpu, i, dynamic_power, static_power);
> +
> +		devm_kfree(&cdev->device, load_cpu);

You may want to move the devm_kfree() out of the
trace_thermal_power_cpu_limit_enabled() check. There could be a race
where that gets disabled while this function is running and you just
leaked memory.

	if (load_cpu)
		devm_kfree(&cdev->device, load_cpu);

should be done by itself.

-- Steve

> +	}
>  
>  	*power = static_power + dynamic_power;
>  	return 0;
> @@ -664,6 +689,8 @@ static int cpufreq_power2state(struct thermal_cooling_device *cdev,
>  		return -EINVAL;
>  	}
>  
> +	trace_thermal_power_cpu_limit(&cpufreq_device->allowed_cpus,
> +				      target_freq, *state, power);
>  	return 0;
>  }
>  
--
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