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>
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b6505deafa
Коммит
999c286347
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@ -3629,7 +3629,6 @@ static int rcu_cpu_notify(struct notifier_block *self,
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struct rcu_node *rnp = rdp->mynode;
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struct rcu_node *rnp = rdp->mynode;
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struct rcu_state *rsp;
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struct rcu_state *rsp;
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trace_rcu_utilization(TPS("Start CPU hotplug"));
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switch (action) {
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switch (action) {
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case CPU_UP_PREPARE:
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case CPU_UP_PREPARE:
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case CPU_UP_PREPARE_FROZEN:
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case CPU_UP_PREPARE_FROZEN:
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@ -3661,7 +3660,6 @@ static int rcu_cpu_notify(struct notifier_block *self,
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default:
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default:
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break;
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break;
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}
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}
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trace_rcu_utilization(TPS("End CPU hotplug"));
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return NOTIFY_OK;
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return NOTIFY_OK;
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}
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}
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