Re: cond_resched() and RCU CPU stall warnings

[Mike Galbraith]

On Sat, 2014-03-15 at 23:25 -0700, Paul E. McKenney wrote: 
> On Sun, Mar 16, 2014 at 07:09:42AM +0100, Mike Galbraith wrote:

> > Hm.  Since you only care about the case where your task is solo, how
> > about do racy checks, 100% accuracy isn't required is it?  Seems you
> > wouldn't want to unconditionally do that in tight loops.
> 
> And indeed, my current workaround unconditionally does schedule() one
> out of 256 loops.  I would do something similar here, perhaps based
> on per-CPU counters, perhaps even with racy accesses to avoid always
> doing preempt_disable()/preempt_enable().
> 
> Or did you have something else in mind?

Exactly what I meant, take a racy peek or two first.

-Mike

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