linux-kernel - Re: [PATCH] sched: Support compiling out real-time scheduling with REALTIME

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Date:	Wed, 15 Aug 2012 09:12:20 +0200
From:	Mike Galbraith <efault@....de>
To:	Trevor Brandt <tjbrandt@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Josh Triplett <josh@...htriplett.org>,
	Eric Paris <eparis@...hat.com>,
	Fabio Estevam <fabio.estevam@...escale.com>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Glauber Costa <glommer@...allels.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, team-fjord@...glegroups.com
Subject: Re: [PATCH] sched: Support compiling out real-time scheduling with
 REALTIME_SCHED.

On Tue, 2012-08-14 at 13:50 -0700, Trevor Brandt wrote:

> diff --git a/init/Kconfig b/init/Kconfig
> index 3f42cd6..768dc76 100644
> --- a/init/Kconfig
> +++ b/init/Kconfig
> @@ -27,6 +27,13 @@ config IRQ_WORK
>  	bool
>  	depends on HAVE_IRQ_WORK
>  
> +config REALTIME_SCHED
> +	bool "Realtime Scheduler" if EXPERT
> +	default y
> +	help
> +	  This option enables support for the realtime scheduler and the
> +	  corresponding scheduling classes SCHED_FIFO and SCHED_RR.
> +
>  menu "General setup"
>  
>  config EXPERIMENTAL

If you inverted that, it could be a proper default n new feature [1].

However, if weight loss is the goal, why not go whole hog, and create
sched/thin.c containing no lard... or just integrate an existing thin
scheduler as a config option?  Whole body replacement is a very radical
diet, but somehow seems less so than chopping off fingers and toes.

-Mike

(that SMP could select to greatly simplify RT)

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