Messages in this thread | | | Date | Mon, 29 Aug 2011 19:11:57 +0200 | From | Frederic Weisbecker <> | Subject | Re: [PATCH 05/32] nohz: Move rcu dynticks idle mode handling to idle enter/exit APIs |
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On Mon, Aug 29, 2011 at 04:25:22PM +0200, Peter Zijlstra wrote: > 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?
But we can stop the tick from the kernel, not just userspace.
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