linux-kernel - Re: [PATCH v3 08/12] sched: move cfs task on a CPU with higher capacity

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Message-ID: <20140710111833.GY3935@laptop>
Date:	Thu, 10 Jul 2014 13:18:33 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Vincent Guittot <vincent.guittot@...aro.org>
Cc:	mingo@...nel.org, linux-kernel@...r.kernel.org,
	linux@....linux.org.uk, linux-arm-kernel@...ts.infradead.org,
	preeti@...ux.vnet.ibm.com, Morten.Rasmussen@....com, efault@....de,
	nicolas.pitre@...aro.org, linaro-kernel@...ts.linaro.org,
	daniel.lezcano@...aro.org, dietmar.eggemann@....com
Subject: Re: [PATCH v3 08/12] sched: move cfs task on a CPU with higher
 capacity

On Mon, Jun 30, 2014 at 06:05:39PM +0200, Vincent Guittot wrote:
> +		/*
> +		 * If the CPUs share their cache and the src_cpu's capacity is
> +		 * reduced because of other sched_class or IRQs, we trig an
> +		 * active balance to move the task
> +		 */
> +		if ((sd->flags & SD_SHARE_PKG_RESOURCES)
> +		 && ((capacity_orig_of(src_cpu) * 100) > (capacity_of(src_cpu) *
> +							sd->imbalance_pct)))
>  			return 1;

Why is this tied to shared caches?
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