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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2015-01-31 21:12:02 -0800 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2015-03-11 13:22:39 -0700 |
| commit | 999c286347538388170f919146d7cfa58689472e (patch) | |
| tree | eef4c1ae5e39c7c1db844dbecc3155be55daa92d /kernel/rcu | |
| parent | b6505deafa1397c81c3f268bfe0f349cf0be2b97 (diff) | |
| download | linux-999c286347538388170f919146d7cfa58689472e.tar.gz linux-999c286347538388170f919146d7cfa58689472e.tar.bz2 linux-999c286347538388170f919146d7cfa58689472e.zip | |
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@intel.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'kernel/rcu')
| -rw-r--r-- | kernel/rcu/tree.c | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index b42001fd55fb..a7151d26b940 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; } |