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rcu: Fix tracepoint tracking RCU CPU kthread utilization
In the call to trace_rcu_utilization() at the start of the loop in rcu_cpu_kthread(), "rcu_wait" is incorrect, plus this trace event needs to be hoisted above the loop to balance with either the "rcu_wait" or "rcu_yield", depending on how the loop exits. This commit therefore makes these changes. Signed-off-by: Lai Jiangshan <jiangshanlai@gmail.com> Signed-off-by: Lai Jiangshan <laijs@linux.alibaba.com> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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@ -2474,8 +2474,8 @@ static void rcu_cpu_kthread(unsigned int cpu)
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char work, *workp = this_cpu_ptr(&rcu_data.rcu_cpu_has_work);
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int spincnt;
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trace_rcu_utilization(TPS("Start CPU kthread@rcu_run"));
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for (spincnt = 0; spincnt < 10; spincnt++) {
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trace_rcu_utilization(TPS("Start CPU kthread@rcu_wait"));
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local_bh_disable();
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*statusp = RCU_KTHREAD_RUNNING;
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local_irq_disable();
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