Messages in this thread Patch in this message | | | From | "Paul E. McKenney" <> | Subject | [PATCH tip/core/rcu 11/20] rcu: More clearly identify grace-period kthread stack dump | Date | Mon, 26 Feb 2018 13:53:01 -0800 |
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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> --- 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); } -- 2.5.2
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