Re: [PATCH 05/32] nohz: Move rcu dynticks idle mode handling toidle enter/exit APIs

[Peter Zijlstra]

On Mon, 2011-08-15 at 17:52 +0200, Frederic Weisbecker wrote:
> To prepare for nohz / idle logic split, pull out the rcu dynticks
> idle mode switching to strict idle entry/exit areas.
> 
> So we make the dyntick mode possible without always involving rcu
> extended quiescent state. 

Why is this a good thing? I would be thinking that if we're a userspace
bound task and we disable the tick rcu would be finished on this cpu and
thus the extended quiescent state is just what we want?


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