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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2015-10-01 10:38:16 -0700
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2015-12-05 17:58:05 -0800
commitb1adb3e2736b695821badc715d2c7a5d873b8b94 (patch)
treeb267b6bed91ed2f9105c27dd067cedef7bed7006 /kernel/rcu
parenta0e3a3aa2841d5720a277de53b6882eb8b2ef698 (diff)
downloadlinux-sh-b1adb3e2736b695821badc715d2c7a5d873b8b94.tar.gz
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@linux.vnet.ibm.com> [ paulmck: Split into prior commit and this commit, as suggested by Josh Triplett. ] Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Diffstat (limited to 'kernel/rcu')
-rw-r--r--kernel/rcu/tree.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index e2315fb57b23..7b78c88e19a3 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);
+ }
}
/*