linux-kernel - Re: [PATCH 2/3] sched: enforce per-cpu utilization limits on runtime balancing

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Message-ID: <1267129703.22519.559.camel@laptop>
Date:	Thu, 25 Feb 2010 21:28:23 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Fabio Checconi <fchecconi@...il.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	Paul Turner <pjt@...gle.com>,
	Dario Faggioli <faggioli@...dalf.sssup.it>,
	Michael Trimarchi <michael@...dence.eu.com>,
	Dhaval Giani <dhaval@...is.sssup.it>,
	Tommaso Cucinotta <t.cucinotta@...up.it>,
	linux-kernel@...r.kernel.org,
	Fabio Checconi <fabio@...dalf.sssup.it>
Subject: Re: [PATCH 2/3] sched: enforce per-cpu utilization limits on
 runtime balancing

On Tue, 2010-02-23 at 19:56 +0100, Fabio Checconi wrote:
> +#ifdef CONFIG_SMP
> +static inline unsigned long rt_init_free_bw(void)
> +{
> +       unsigned long used = to_ratio(global_rt_period(), global_rt_runtime());
> +
> +       return to_ratio(RUNTIME_INF, RUNTIME_INF) - used;
> +}
> +#endif

> +static void __rt_restart_balancing(void)
> +{
> +       unsigned long used, global, free;
> +       struct rq *rq;
> +       int i;
> +
> +       used = rt_used_bandwidth();
> +       global = to_ratio(RUNTIME_INF, RUNTIME_INF);
> +
> +       free = global - used;


We take the max as RUNTIME_INF instead of global_rt_* so that we can
move runtime around and fully saturate a single cpu (given there is
enough free to compensate on other cpus) ?

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