linux-kernel - Re: [tip:sched/core] sched, nohz: Exclude isolated cores from load balancing

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Message-ID: <1393211920.5599.25.camel@marge.simpson.net>
Date:	Mon, 24 Feb 2014 04:18:40 +0100
From:	Mike Galbraith <mgalbraith@...e.de>
To:	Lei Wen <adrian.wenl@...il.com>
Cc:	mingo@...nel.org, hpa@...or.com, linux-kernel@...r.kernel.org,
	peterz@...radead.org, leiwen@...vell.com, tglx@...utronix.de,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:sched/core] sched, nohz: Exclude isolated cores from load
 balancing

On Mon, 2014-02-24 at 10:11 +0800, Lei Wen wrote:

> How about use the API as cpumask_test_and_clear_cpu?
> Then below one line is enough.

Yeah.

> +               if (likely(cpumask_test_and_clear_cpu(cpu,
> nohz.idle_cpus_mask))) {
> 
> And I am not pretty sure whether we need such test here.

It was born because I watched me wreck nohz.nr_cpus :)

-Mike

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