rcu: Add RCU_FAST_NO_HZ tracing for idle exit
Traces of rcu_prep_idle events can be confusing because rcu_cleanup_after_idle() does no tracing. This commit therefore adds this tracing. Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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@ -292,6 +292,7 @@ TRACE_EVENT(rcu_dyntick,
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* "More callbacks": Still more callbacks, try again to clear them out.
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* "More callbacks": Still more callbacks, try again to clear them out.
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* "Callbacks drained": All callbacks processed, off to dyntick idle!
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* "Callbacks drained": All callbacks processed, off to dyntick idle!
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* "Timer": Timer fired to cause CPU to continue processing callbacks.
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* "Timer": Timer fired to cause CPU to continue processing callbacks.
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* "Cleanup after idle": Idle exited, timer canceled.
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*/
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*/
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TRACE_EVENT(rcu_prep_idle,
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TRACE_EVENT(rcu_prep_idle,
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@ -2085,6 +2085,7 @@ static void rcu_prepare_for_idle_init(int cpu)
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static void rcu_cleanup_after_idle(int cpu)
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static void rcu_cleanup_after_idle(int cpu)
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{
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{
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hrtimer_cancel(&per_cpu(rcu_idle_gp_timer, cpu));
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hrtimer_cancel(&per_cpu(rcu_idle_gp_timer, cpu));
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trace_rcu_prep_idle("Cleanup after idle");
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}
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}
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/*
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/*
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