Re: [GIT PULL timers] Timer-wheel bandaids^Wcommits for 3.15

[Mike Galbraith]

On Thu, 2014-02-27 at 17:27 -0800, Paul E. McKenney wrote: 
> Hello, Thomas and Ingo,
> 
> This pull request contains latency bandaids^Woptimizations to the
> timer-wheel code that are useful in conjunction with NO_HZ_FULL Kconfig
> option.  These optimizations reduce the jiffy-by-jiffy looping in cases
> where there is either zero or one timers in the timer wheel, which is
> a common case for NO_HZ_FULL "worker" CPUs that run almost entirely
> in usermode for a single task.

FWIW, these have seen quite a bit of runtime on various boxen, both in
day to day and piddle about -rt kernels, with zero attention grabbers.

-Mike

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