This series covers enhancements to RCU_FAST_NO_HZ intended for v3.4-rc2.
The individual commits are as follows:
1. Add tracing to rcu_cleanup_after_idle().
2. Switch from hrtimer to normal timers to reduce overhead.
3. Upgrade RCU_FAST_NO_HZ state machine to better account for
brief pauses out of idle, which can happen due to power-management
actions, Steven Rostedt's new RCU-idle-capable tracing macros,
or my RCU_NONIDLE() macro.
4. Use add_timer_on() to avoid timer migration.
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