Re: [PATCH 0/2] rcu: Extended quiescent state for adaptive nohz

[Frederic Weisbecker]

On Thu, Jun 07, 2012 at 03:45:08PM -0700, Paul E. McKenney wrote:
> > I can see you've implemented a version for TinyRCU. Nohz cpusets only work on
> > SMP right now because there must be at least one CPU running with the tick
> > to maintain the timekeeping. I'm pretty confident that one day we'll remove
> > the jiffies and we'll be able to do the whole timekeeping by using the TSC
> > or so. There is quite a way before we reach that though.
> 
> In the meantime, would it make sense to slow the tick rate by a factor
> of 10 or so on that one CPU when nothing else is going on?  Or does
> timekeeping absolutely require running the tick at full speed?

I'm not sure of the possible consequences of that.
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