linux-kernel - Re: [PATCH v5] sched/rt: Use IPI to trigger RT task push migration instead of pulling

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Message-ID: <20150320102542.GY23123@twins.programming.kicks-ass.net>
Date:	Fri, 20 Mar 2015 11:25:42 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Clark Williams <williams@...hat.com>,
	linux-rt-users <linux-rt-users@...r.kernel.org>,
	Mike Galbraith <umgwanakikbuti@...il.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Jörn Engel <joern@...estorage.com>
Subject: Re: [PATCH v5] sched/rt: Use IPI to trigger RT task push migration
 instead of pulling

On Wed, Mar 18, 2015 at 02:49:46PM -0400, Steven Rostedt wrote:
> +static int find_next_push_cpu(struct rq *rq)
> +{
> +	struct rq *next_rq;
> +	int cpu;
> +
> +	while (1) {

We typically tend to write: for (;;), instead, however would a do { }
while () loop not make more sense here?

	do {
		cpu = rto_next_cpu(rq);
		if (cpu >= nr_cpu_ids)
			break;

		next_rq = cpu_rq(cpu);
	} while (next_rq->rt.highest_prio.next >= rq->rt.highest_prio.curr);

> +	return cpu;
> +}
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