Commit-ID: b1adb3e2736b695821badc715d2c7a5d873b8b94
Gitweb: http://git.kernel.org/tip/b1adb3e2736b695821badc715d2c7a5d873b8b94
Author: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
AuthorDate: Thu, 1 Oct 2015 10:38:16 -0700
Committer: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
CommitDate: Sat, 5 Dec 2015 17:58:05 -0800
rcutorture: Dump stack when GP kthread stalls
This commit increases debug information in the case where the grace-period
kthread is being prevented from running by dumping that kthread's stack.
Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
[ paulmck: Split into prior commit and this commit, as suggested by
Josh Triplett. ]
Reviewed-by: Josh Triplett <josh@xxxxxxxxxxxxxxxx>
---
kernel/rcu/tree.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index e2315fb..7b78c88 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -1196,12 +1196,15 @@ static void rcu_check_gp_kthread_starvation(struct rcu_state *rsp)
j = jiffies;
gpa = READ_ONCE(rsp->gp_activity);
- if (j - gpa > 2 * HZ)
+ if (j - gpa > 2 * HZ) {
pr_err("%s kthread starved for %ld jiffies! g%lu c%lu f%#x s%d ->state=%#lx\n",
rsp->name, j - gpa,
rsp->gpnum, rsp->completed,
rsp->gp_flags, rsp->gp_state,
rsp->gp_kthread ? rsp->gp_kthread->state : ~0);
+ if (rsp->gp_kthread)
+ sched_show_task(rsp->gp_kthread);
+ }
}
/*
--
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