Messages in this thread | | | Date | Fri, 29 May 2009 01:40:11 +0900 | From | Paul Mundt <> | Subject | Re: [PATCH] sched: Support current clocksource handling in fallback sched_clock(). |
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On Thu, May 28, 2009 at 06:32:09PM +0200, Peter Zijlstra wrote: > On Thu, 2009-05-28 at 09:13 -0700, Daniel Walker wrote: > > On Thu, 2009-05-28 at 14:59 +0200, Peter Zijlstra wrote: > > > CPU0 CPU1 > > > > > > clock = ACCESS_ONCE(sched_clocksource); > > > > > > unload module > > > clocksource_unregister() > > > sched_clocksource = jiffies > > > unmap data/text > > > > > > cyc2ns(clock, clocksource_read(clock)) <--- fireworks > > > > > > > > > > Do any module based clocksources even exist right now? > > clocksource_unregister only seems to be used 3 times.. > > Good point, it appears its not even exported. > > Thomas mentioned modules, I assumed. > The drivers/clocksource/ drivers in theory could be modular anyways. Handling this transition properly is at least one less barrier to modular clocksources, so I think it's progress regardless. I don't remember what all of the other issues were though, John probably remembers.
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