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.

Paul E. McKenney committed 14 years ago

Commit 2fdbb311 parent 66f75a52 files · +2 −0Browse files

Unified · Split

2 files

@@ -292,6 +292,7 @@ TRACE_EVENT(rcu_dyntick, · 291 unmodified lines
292	* "More callbacks": Still more callbacks, try again to clear them out.	292	* "More callbacks": Still more callbacks, try again to clear them out.
293	* "Callbacks drained": All callbacks processed, off to dyntick idle!	293	* "Callbacks drained": All callbacks processed, off to dyntick idle!
294	* "Timer": Timer fired to cause CPU to continue processing callbacks.	294	* "Timer": Timer fired to cause CPU to continue processing callbacks.
		295	* "Cleanup after idle": Idle exited, timer canceled.
295	*/	296	*/
296	TRACE_EVENT(rcu_prep_idle,	297	TRACE_EVENT(rcu_prep_idle,
297		298

@@ -2085,6 +2085,7 @@ static void rcu_prepare_for_idle_init(int cpu) · 2084 unmodified lines
2085	static void rcu_cleanup_after_idle(int cpu)	2085	static void rcu_cleanup_after_idle(int cpu)
2086	{	2086	{
2087	hrtimer_cancel(&per_cpu(rcu_idle_gp_timer, cpu));	2087	hrtimer_cancel(&per_cpu(rcu_idle_gp_timer, cpu));
		2088	trace_rcu_prep_idle("Cleanup after idle");
2088	}	2089	}
2089		2090
2090	/*	2091	/*