linux-kernel - Re: [PATCH v2 5/7] sched: add a new SD_SHARE_POWERDOMAIN for sched

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Date:	Wed, 19 Mar 2014 13:01:22 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Vincent Guittot <vincent.guittot@...aro.org>
Cc:	mingo@...nel.org, linux-kernel@...r.kernel.org,
	dietmar.eggemann@....com, preeti@...ux.vnet.ibm.com,
	tony.luck@...el.com, fenghua.yu@...el.com, schwidefsky@...ibm.com,
	james.hogan@...tec.com, cmetcalf@...era.com,
	benh@...nel.crashing.org, linux@....linux.org.uk,
	linux-arm-kernel@...ts.infradead.org,
	linaro-kernel@...ts.linaro.org
Subject: Re: [PATCH v2 5/7] sched: add a new SD_SHARE_POWERDOMAIN for
 sched_domain

On Tue, Mar 18, 2014 at 06:56:47PM +0100, Vincent Guittot wrote:
> A new flag SD_SHARE_POWERDOMAIN is created to reflect whether groups of CPUs
> in a sched_domain level can or not reach different power state. As an example,
> the flag should be cleared at CPU level if groups of cores can be power gated
> independently. This information can be used to add load balancing level between
> group of CPUs than can power gate independantly. The default behavior of the
> scheduler is to spread tasks across CPUs and groups of CPUs 

> so the flag is set into all sched_domains.

I suppose that is the part Preeti stumbled over; as did I. Its not set
at all.
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