Re: [PATCH tip/core/rcu] Do not keep timekeeping CPU tick running for non-nohz_full= CPUs

[Peter Zijlstra]

On Sun, Jul 20, 2014 at 04:47:59AM -0700, Paul E. McKenney wrote:
> So we really have to have -all- the CPUs be idle to turn off the timekeeper.

That seems to be pretty unavoidable any which way around.

> This won't make the battery-powered embedded guys happy...
> 
> Other thoughts on this?  We really should not be setting
> CONFIG_NO_HZ_FULL_SYSIDLE by default until this is solved.

What are those same guys doing with nohz_full to begin with?

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