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authorLai Jiangshan <jiangshanlai@gmail.com>2019-10-15 10:23:57 +0000
committerPaul E. McKenney <paulmck@kernel.org>2020-01-24 10:33:31 -0800
commit2488a5e695564897a0f8ea42cd3af71647cd26d2 (patch)
treedb67d218e4439daf2a3296577fb6266f15f5601a /kernel/rcu/tree.c
parent822175e72995a9ff7eeef4f5cd3f945f2697b67d (diff)
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>
Diffstat (limited to 'kernel/rcu/tree.c')
-rw-r--r--kernel/rcu/tree.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index dd8cfc34f4da..ba154a3080fb 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -2474,8 +2474,8 @@ static void rcu_cpu_kthread(unsigned int cpu)
char work, *workp = this_cpu_ptr(&rcu_data.rcu_cpu_has_work);
int spincnt;
+ trace_rcu_utilization(TPS("Start CPU kthread@rcu_run"));
for (spincnt = 0; spincnt < 10; spincnt++) {
- trace_rcu_utilization(TPS("Start CPU kthread@rcu_wait"));
local_bh_disable();
*statusp = RCU_KTHREAD_RUNNING;
local_irq_disable();