linux-kernel - Re: [PATCH] sched: smart wake-affine

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Date:	Tue, 02 Jul 2013 07:38:37 +0200
From:	Mike Galbraith <efault@....de>
To:	Michael Wang <wangyun@...ux.vnet.ibm.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Alex Shi <alex.shi@...el.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Paul Turner <pjt@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Nikunj A. Dadhania" <nikunj@...ux.vnet.ibm.com>,
	Ram Pai <linuxram@...ibm.com>
Subject: Re: [PATCH] sched: smart wake-affine

On Tue, 2013-07-02 at 12:43 +0800, Michael Wang wrote:

> +static int nasty_pull(struct task_struct *p)
> +{
> +	int factor = cpumask_weight(cpu_online_mask);
> +
> +	/*
> +	 * Yeah, it's the switching-frequency, could means many wakee or
> +	 * rapidly switch, use factor here will just help to automatically
> +	 * adjust the loose-degree, so more cpu will lead to more pull.
> +	 */
> +	if (p->nr_wakee_switch > factor) {
> +		/*
> +		 * wakee is somewhat hot, it needs certain amount of cpu
> +		 * resource, so if waker is far more hot, prefer to leave
> +		 * it alone.
> +		 */
> +		if (current->nr_wakee_switch > (factor * p->nr_wakee_switch))
> +			return 1;
> +	}
> +
> +	return 0;
> +}

Ew.  I haven't gotten around to test-driving this patchlet, and I see
you haven't gotten around to finding a better name either.  Any other
name will likely have a better chance of flying.

tasks_related()
...
well, nearly any..
tasks_think_wake_affine_sucks_rocks()
..that won't fly either :)

-Mike

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