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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>
This commit is contained in:
Lai Jiangshan 2019-10-15 10:23:57 +00:00 committed by Paul E. McKenney
parent 822175e729
commit 2488a5e695
1 changed files with 1 additions and 1 deletions
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2
kernel/rcu/tree.c
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@ -2474,8 +2474,8 @@ static void rcu_cpu_kthread(unsigned int cpu)
char work, *workp = this_cpu_ptr(&rcu_data.rcu_cpu_has_work); char work, *workp = this_cpu_ptr(&rcu_data.rcu_cpu_has_work);
int spincnt; int spincnt;
trace_rcu_utilization(TPS("Start CPU kthread@rcu_run"));
for (spincnt = 0; spincnt < 10; spincnt++) { for (spincnt = 0; spincnt < 10; spincnt++) {
trace_rcu_utilization(TPS("Start CPU kthread@rcu_wait"));
local_bh_disable(); local_bh_disable();
*statusp = RCU_KTHREAD_RUNNING; *statusp = RCU_KTHREAD_RUNNING;
local_irq_disable(); local_irq_disable();