Re: [PATCH tip/core/rcu 0/9] Preview of additional RCU changes for 3.3

[Josh Triplett <josh@joshtriplett.org>]

On Tue, Nov 15, 2011 at 12:27:36PM -0800, Paul E. McKenney wrote:
> This patchset is in addition to the set previously posted (see
> https://lkml.org/lkml/2011/11/2/363).  This new set permits the
> reworked RCU_FAST_NO_HZ code to be used from TREE_PREEMPT_RCU,
> allows rcutorture to shut down the system after a fixed time
> period (useful for KVM-based testing), adds an API to
> replace the "->pid == 0" discussed in response to the earlier
> patch set, and applies this API where applicable.  The patches are
> as follows:
> 
> 1.	Update the RCU_FAST_NO_HZ config definition to allow it to
> 	be used in TREE_PREEMPT_RCU builds, since that is now legal.
> 2.	Add a module parameter that permit rcutorture to shut down the
> 	system cleanly after the test has run for the specified time.
> 3.	Add a module parameter to allow rcutorture start running
> 	as soon as it is initialized.
> 4.	Add is_idle_task() API to replace open-coded tests of ->pid
> 	against zero.
> 5-9.	Apply the new is_idle_task() API where it makes sense.

I replied to patches 2-4 with review comments.  For the rest:

Reviewed-by: Josh Triplett <josh@joshtriplett.org>