Re: [PATCH 1/5] user_hooks: New user hooks subsystem

[Frederic Weisbecker]

On Fri, Jul 27, 2012 at 09:40:54AM -0700, Paul E. McKenney wrote:
> On Fri, Jul 27, 2012 at 05:40:30PM +0200, Frederic Weisbecker wrote:
> > Create a new subsystem that handles the hooks on kernel/user
> > boundaries currently used by RCU for its userspace extended
> > quiescent state.
> > 
> > We need to pull this up from RCU into this new level of indirection
> > because these hooks are also going to be used to implement an "on
> > demand" generic virtual cputime accounting. A necessary step to
> > shutdown the tick while still accounting the cputime.
> 
> So this eliminates the case where the architecture might enter an
> RCU extended quiescent state multiple times, but exit it only once?
> (I am hoping that it does...)

Yeah. It should handle that.
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