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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>
This commit is contained in:
Paul E. McKenney 2015-01-31 21:12:02 -08:00
parent b6505deafa
commit 999c286347
1 changed files with 0 additions and 2 deletions
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2
kernel/rcu/tree.c
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@ -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;
}