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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2018-01-11 12:08:20 -0800
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2018-02-20 16:10:29 -0800
commitd07aee2c035e04dce11209a870b48091a47bd04a (patch)
tree4edd492d889e362dc37de61ab1f885e4c1589b1b /kernel/rcu
parentd62df57370a5215fbf1b088d2ee51fa5d69bd0c3 (diff)
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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>
Diffstat (limited to 'kernel/rcu')
-rw-r--r--kernel/rcu/tree.c1
1 files changed, 1 insertions, 0 deletions
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);
}