Commit-ID: 999c286347538388170f919146d7cfa58689472e
Gitweb: http://git.kernel.org/tip/999c286347538388170f919146d7cfa58689472e
Author: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
AuthorDate: Sat, 31 Jan 2015 21:12:02 -0800
Committer: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
CommitDate: Wed, 11 Mar 2015 13:22:39 -0700
rcu: Remove event tracing from rcu_cpu_notify(), used by offline CPUs
Offline CPUs cannot safely invoke trace events, but such CPUs do execute
within rcu_cpu_notify(). Therefore, this commit removes the trace events
from rcu_cpu_notify(). These trace events are for utilization, against
which rcu_cpu_notify() execution time should be negligible.
Reported-by: Fengguang Wu <fengguang.wu@xxxxxxxxx>
Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
---
kernel/rcu/tree.c | 2 --
1 file changed, 2 deletions(-)
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index b42001f..a7151d2 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -3629,7 +3629,6 @@ static int rcu_cpu_notify(struct notifier_block *self,
struct rcu_node *rnp = rdp->mynode;
struct rcu_state *rsp;
- trace_rcu_utilization(TPS("Start CPU hotplug"));
switch (action) {
case CPU_UP_PREPARE:
case CPU_UP_PREPARE_FROZEN:
@@ -3661,7 +3660,6 @@ static int rcu_cpu_notify(struct notifier_block *self,
default:
break;
}
- trace_rcu_utilization(TPS("End CPU hotplug"));
return NOTIFY_OK;
}
--
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