linux-kernel - Re: [RFC PATCH 02/16] sched: Introduce CONFIG_SCHED

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Message-ID: <20140608060316.GA18179@austad.us>
Date:	Sun, 8 Jun 2014 08:03:16 +0200
From:	Henrik Austad <henrik@...tad.us>
To:	Morten Rasmussen <morten.rasmussen@....com>
Cc:	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	peterz@...radead.org, mingo@...nel.org, rjw@...ysocki.net,
	vincent.guittot@...aro.org, daniel.lezcano@...aro.org,
	preeti@...ux.vnet.ibm.com, dietmar.eggemann@....com
Subject: Re: [RFC PATCH 02/16] sched: Introduce CONFIG_SCHED_ENERGY

On Fri, May 23, 2014 at 07:16:29PM +0100, Morten Rasmussen wrote:
> The Energy-aware scheduler implementation is guarded by
> CONFIG_SCHED_ENERGY.
> 
> Signed-off-by: Dietmar Eggemann <dietmar.eggemann@....com>
> Signed-off-by: Morten Rasmussen <morten.rasmussen@....com>
> ---
>  arch/arm/Kconfig |    5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
> index ab438cb..bfc3a85 100644
> --- a/arch/arm/Kconfig
> +++ b/arch/arm/Kconfig

Is this going to be duplicate for each architecture enabling this? Why
not make a kernel/Kconfig.energy and link to that from those
architectures using it?

> @@ -1926,6 +1926,11 @@ config XEN
>  	help
>  	  Say Y if you want to run Linux in a Virtual Machine on Xen on ARM.
>  
> +config SCHED_ENERGY
> +	bool "Energy-aware scheduling (EXPERIMENTAL)"
> +	help
> +	  Highly experimental energy aware task scheduling.
> +

how about adding *slightly* more info here? :) (yes, yes, I know it's an RFC)

"""
Highly experimental energy aware task scheduling.

This will allow the kernel to keep track of energy required for
different capacity levels for a given CPU. That way, the scheduler can
make more informed decisions as to where a newly woken task should be
placed. Heterogenous platform will benefit the most from this option.

Enabling this will add a significant overhead for a task-switch.

If unsure, say N here.
"""

>  endmenu
>  
>  menu "Boot options"
> -- 
> 1.7.9.5
> 
> 
> --
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-- 
Henrik Austad
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