From mboxrd@z Thu Jan 1 00:00:00 1970 From: Paul Mundt Date: Thu, 28 May 2009 23:37:16 +0000 Subject: Re: [PATCH] sched: Support current clocksource handling in fallback sched_clock(). Message-Id: <20090528233716.GB1122@linux-sh.org> List-Id: References: <20090528164011.GA30104@linux-sh.org> <1243529547.28705.43.camel@desktop> <20090528165816.GA31688@linux-sh.org> <1243532324.28705.75.camel@desktop> <20090528175341.GA32118@linux-sh.org> <1243534252.28705.86.camel@desktop> <20090528182730.GA32767@linux-sh.org> <1243537463.28705.94.camel@desktop> <20090528193458.GA1122@linux-sh.org> <1243539663.28705.99.camel@desktop> In-Reply-To: <1243539663.28705.99.camel@desktop> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Daniel Walker Cc: Peter Zijlstra , Thomas Gleixner , Linus Walleij , Ingo Molnar , Andrew Victor , Haavard Skinnemoen , Andrew Morton , linux-kernel@vger.kernel.org, linux-sh@vger.kernel.org, linux-arm-kernel@lists.arm.linux.org.uk, John Stultz 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.