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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.

CRs-fixed: 657837
Change-Id: I8ce6251d06e25f3ff26fe016aae456a33c40a466
Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Git-commit: 2fdbb31b66
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Signed-off-by: Ramesh Gupta Guntha <rggupt@codeaurora.org>
This commit is contained in:
Paul E. McKenney 2012-02-23 15:58:29 -08:00 committed by Zhao Wei Liew
parent c0ba586010
commit 4445aae216
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.
* "Callbacks drained": All callbacks processed, off to dyntick idle!
* "Timer": Timer fired to cause CPU to continue processing callbacks.
* "Cleanup after idle": Idle exited, timer canceled.
*/
TRACE_EVENT(rcu_prep_idle,

1
kernel/rcutree_plugin.h
View file

@ -2088,6 +2088,7 @@ static void rcu_prepare_for_idle_init(int cpu)
static void rcu_cleanup_after_idle(int cpu)
{
hrtimer_cancel(&per_cpu(rcu_idle_gp_timer, cpu));
trace_rcu_prep_idle("Cleanup after idle");
}
/*