Commit-ID: d07aee2c035e04dce11209a870b48091a47bd04a
Gitweb: https://git.kernel.org/tip/d07aee2c035e04dce11209a870b48091a47bd04a
Author: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
AuthorDate: Thu, 11 Jan 2018 12:08:20 -0800
Committer: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
CommitDate: Tue, 20 Feb 2018 16:10:29 -0800
rcu: More clearly identify grace-period kthread stack dump
It is not always obvious that the stack dump from a starved grace-period
kthread isn't instead that of a CPU stalling the current grace period.
This commit therefore adds a pr_err() flagging these dumps.
Reported-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
---
kernel/rcu/tree.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 86fc087c7777..4d7c727020f0 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -1350,6 +1350,7 @@ static void rcu_check_gp_kthread_starvation(struct rcu_state *rsp)
rsp->gp_kthread ? rsp->gp_kthread->state : ~0,
rsp->gp_kthread ? task_cpu(rsp->gp_kthread) : -1);
if (rsp->gp_kthread) {
+ pr_err("RCU grace-period kthread stack dump:\n");
sched_show_task(rsp->gp_kthread);
wake_up_process(rsp->gp_kthread);
}
--
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