Commit-ID: 5dffed1e5721f6deae4fd67d32386ef037c5fc56
Gitweb: http://git.kernel.org/tip/5dffed1e5721f6deae4fd67d32386ef037c5fc56
Author: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
AuthorDate: Wed, 17 Feb 2016 11:54:28 -0800
Committer: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
CommitDate: Thu, 31 Mar 2016 13:36:37 -0700
rcu: Dump ftrace buffer when kicking grace-period kthread
If it is necessary to kick the grace-period kthread, that is a good
time to dump the trace buffer in order to learn why kicking was needed.
This commit therefore does the dump.
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 a739292..86edb92 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -1266,6 +1266,7 @@ static void rcu_stall_kick_kthreads(struct rcu_state *rsp)
j = READ_ONCE(rsp->jiffies_kick_kthreads);
if (time_after(jiffies, j) && rsp->gp_kthread) {
WARN_ONCE(1, "Kicking %s grace-period kthread\n", rsp->name);
+ rcu_ftrace_dump(DUMP_ALL);
wake_up_process(rsp->gp_kthread);
WRITE_ONCE(rsp->jiffies_kick_kthreads, j + HZ);
}
--
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