linux-kernel - Re: [RFC PATCH v3 5/6] sched: pack the idle load balance

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Message-ID: <20130426105431.GF8669@dyad.programming.kicks-ass.net>
Date:	Fri, 26 Apr 2013 12:54:31 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Arjan van de Ven <arjan@...ux.intel.com>
Cc:	Alex Shi <alex.shi@...el.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Preeti U Murthy <preeti@...ux.vnet.ibm.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	LAK <linux-arm-kernel@...ts.infradead.org>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	Ingo Molnar <mingo@...nel.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Paul Turner <pjt@...gle.com>,
	Santosh <santosh.shilimkar@...com>,
	Morten Rasmussen <morten.rasmussen@....com>,
	Chander Kashyap <chander.kashyap@...aro.org>,
	"cmetcalf@...era.com" <cmetcalf@...era.com>,
	"tony.luck@...el.com" <tony.luck@...el.com>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Len Brown <len.brown@...el.com>,
	Amit Kucheria <amit.kucheria@...aro.org>,
	Jonathan Corbet <corbet@....net>
Subject: Re: [RFC PATCH v3 5/6] sched: pack the idle load balance

On Tue, Apr 23, 2013 at 08:30:58AM -0700, Arjan van de Ven wrote:
> For x86 we should not be setting such flag then; we don't have a way for some cpu packages to
> go to an extra deep power state if they're completely idle.
> (this afaik is true for both Intel and AMD)

You say 'some'; this implies we do for others, right?

We can dynamically set the required flags in the arch setup when it makes sense.
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