Commit d07aee2c authored Jan 11, 2018 by Paul E. McKenney

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@infradead.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

parent d62df573

kernel/rcu/tree.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -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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