linux-kernel - Re: [RFCv4 PATCH 22/34] sched: Calculate energy consumption of sched

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Date:	Thu, 21 May 2015 13:27:04 +0530
From:	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>
To:	Morten Rasmussen <morten.rasmussen@....com>
Cc:	peterz@...radead.org, mingo@...hat.com, vincent.guittot@...aro.org,
	Dietmar Eggemann <Dietmar.Eggemann@....com>,
	yuyang.du@...el.com, preeti@...ux.vnet.ibm.com,
	mturquette@...aro.org, rjw@...ysocki.net,
	Juri Lelli <Juri.Lelli@....com>, sgurrappadi@...dia.com,
	pang.xunlei@....com.cn, linux-kernel@...r.kernel.org,
	linux-pm@...r.kernel.org
Subject: Re: [RFCv4 PATCH 22/34] sched: Calculate energy consumption of
 sched_group

* Morten Rasmussen <morten.rasmussen@....com> [2015-05-12 20:38:57]:

[...]
> +/*
> + * cpu_norm_usage() returns the cpu usage relative to a specific capacity,
> + * i.e. it's busy ratio, in the range [0..SCHED_LOAD_SCALE] which is useful for
> + * energy calculations. Using the scale-invariant usage returned by
> + * get_cpu_usage() and approximating scale-invariant usage by:
> + *
> + *   usage ~ (curr_freq/max_freq)*1024 * capacity_orig/1024 * running_time/time
> + *
> + * the normalized usage can be found using the specific capacity.
> + *
> + *   capacity = capacity_orig * curr_freq/max_freq
> + *
> + *   norm_usage = running_time/time ~ usage/capacity
> + */
> +static unsigned long cpu_norm_usage(int cpu, unsigned long capacity)
> +{
> +	int usage = __get_cpu_usage(cpu);

__get_cpu_usage is introduced in next patch "sched: Extend sched_group_energy
to test load-balancing decisions", applying the series with this patch as top
most patch breaks the build.

kernel/sched/fair.c: In function âcpu_norm_usageâ:
kernel/sched/fair.c:4830:2: error: implicit declaration of function â__get_cpu_usageâ [-Werror=implicit-function-declaration]
  int usage = __get_cpu_usage(cpu);
  ^

Given that __get_cpu_usage(), take additional parameter - delta. get_cpu_usage()
should have been used here.

Thanks,
Kamalesh

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