linux-kernel - Re: [PATCH] sched: Support current clocksource handling in fallback sched

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Message-ID: <20090528233716.GB1122@linux-sh.org>
Date:	Fri, 29 May 2009 08:37:16 +0900
From:	Paul Mundt <lethal@...ux-sh.org>
To:	Daniel Walker <dwalker@...o99.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linus Walleij <linus.ml.walleij@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Victor <linux@...im.org.za>,
	Haavard Skinnemoen <hskinnemoen@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-sh@...r.kernel.org,
	linux-arm-kernel@...ts.arm.linux.org.uk,
	John Stultz <johnstul@...ux.vnet.ibm.com>
Subject: Re: [PATCH] sched: Support current clocksource handling in fallback sched_clock().

On Thu, May 28, 2009 at 12:41:03PM -0700, Daniel Walker wrote:
> On Fri, 2009-05-29 at 04:34 +0900, Paul Mundt wrote:
> > > I'm still a little confused how kernel modules fit in here.. Are you
> > > saying a user would unload some certain driver which has a pin locked
> > > down and prevents the clocksource from working. Then the user would load
> > > the clocksource module which would now function, and that all would have
> > > to happen in order to enter a certain power state?
> > > 
> > Yes.
> 
> I'm assuming this isn't a low power state, this would be something more
> like suspend or hibernate right?
> 
Right, with the amount of hassle involved, it makes no sense for run-time
PM at least. So the suspend/hibernate use cases are mostly where it makes
sense.
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