From d07aee2c035e04dce11209a870b48091a47bd04a Mon Sep 17 00:00:00 2001 From: "Paul E. McKenney" Date: Thu, 11 Jan 2018 12:08:20 -0800 Subject: 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 Signed-off-by: Paul E. McKenney --- kernel/rcu/tree.c | 1 + 1 file changed, 1 insertion(+) (limited to 'kernel/rcu/tree.c') 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); } -- cgit v1.2.3