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rcu: Add RCU_FAST_NO_HZ tracing for idle exit

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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>
This commit is contained in:
Paul E. McKenney 2012-02-23 15:58:29 -08:00 committed by Paul E. McKenney
parent 66f75a5d02
commit 2fdbb31b66
2 changed files with 2 additions and 0 deletions
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1
include/trace/events/rcu.h
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@ -292,6 +292,7 @@ TRACE_EVENT(rcu_dyntick,
* "More callbacks": Still more callbacks, try again to clear them out. * "More callbacks": Still more callbacks, try again to clear them out.
* "Callbacks drained": All callbacks processed, off to dyntick idle! * "Callbacks drained": All callbacks processed, off to dyntick idle!
* "Timer": Timer fired to cause CPU to continue processing callbacks. * "Timer": Timer fired to cause CPU to continue processing callbacks.
* "Cleanup after idle": Idle exited, timer canceled.
*/ */
TRACE_EVENT(rcu_prep_idle, TRACE_EVENT(rcu_prep_idle,

1
kernel/rcutree_plugin.h
View File

@ -2085,6 +2085,7 @@ static void rcu_prepare_for_idle_init(int cpu)
static void rcu_cleanup_after_idle(int cpu) static void rcu_cleanup_after_idle(int cpu)
{ {
hrtimer_cancel(&per_cpu(rcu_idle_gp_timer, cpu)); hrtimer_cancel(&per_cpu(rcu_idle_gp_timer, cpu));
trace_rcu_prep_idle("Cleanup after idle");
} }
/* /*