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authorPaul E. McKenney <paul.mckenney@linaro.org>2012-02-23 15:58:29 -0800
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2012-04-24 20:55:19 -0700
commit2fdbb31b662787f78bb78b3e4e18f1a072058ffc (patch)
treec8dbe70ab53102acf7f802eb50c5262c82cd45aa
parent66f75a5d028beaf67c931435fdc3e7823125730c (diff)
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>
-rw-r--r--include/trace/events/rcu.h1
-rw-r--r--kernel/rcutree_plugin.h1
2 files changed, 2 insertions, 0 deletions
diff --git a/include/trace/events/rcu.h b/include/trace/events/rcu.h
index 337099783f37..aaa55e1b8c48 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 c023464816be..1e561ab952a3 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");
}
/*