Commit-ID: 2fdbb31b662787f78bb78b3e4e18f1a072058ffc
Gitweb: http://git.kernel.org/tip/2fdbb31b662787f78bb78b3e4e18f1a072058ffc
Author: Paul E. McKenney <paul.mckenney@xxxxxxxxxx>
AuthorDate: Thu, 23 Feb 2012 15:58:29 -0800
Committer: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
CommitDate: Tue, 24 Apr 2012 20:55:19 -0700
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@xxxxxxxxxx>
Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
---
include/trace/events/rcu.h | 1 +
kernel/rcutree_plugin.h | 1 +
2 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/include/trace/events/rcu.h b/include/trace/events/rcu.h
index 3370997..aaa55e1 100644
--- a/include/trace/events/rcu.h
+++ b/include/trace/events/rcu.h
@@ -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,
diff --git a/kernel/rcutree_plugin.h b/kernel/rcutree_plugin.h
index c023464..1e561ab 100644
--- a/kernel/rcutree_plugin.h
+++ b/kernel/rcutree_plugin.h
@@ -2085,6 +2085,7 @@ 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");
}
/*
--
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