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

Open Source and information security mailing list archives

Date:	Wed, 19 Mar 2014 13:29:00 +0100
From:	Vincent Guittot <vincent.guittot@...aro.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	"fenghua.yu@...el.com" <fenghua.yu@...el.com>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	"tony.luck@...el.com" <tony.luck@...el.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	"cmetcalf@...era.com" <cmetcalf@...era.com>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	"schwidefsky@...ibm.com" <schwidefsky@...ibm.com>,
	"james.hogan@...tec.com" <james.hogan@...tec.com>,
	Preeti U Murthy <preeti@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...nel.org>,
	LAK <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 5/7] sched: add a new SD_SHARE_POWERDOMAIN for sched_domain

On 19 March 2014 13:01, Peter Zijlstra <peterz@...radead.org> wrote:
> 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.

yes, it's confusing. i'm going to update the commit message

>
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