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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2015-10-01 20:38:16 +0300 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2015-12-06 04:58:05 +0300 |
| commit | b1adb3e2736b695821badc715d2c7a5d873b8b94 (patch) | |
| tree | b267b6bed91ed2f9105c27dd067cedef7bed7006 | |
| parent | a0e3a3aa2841d5720a277de53b6882eb8b2ef698 (diff) | |
| download | linux-b1adb3e2736b695821badc715d2c7a5d873b8b94.tar.xz | |
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>
| -rw-r--r-- | kernel/rcu/tree.c | 5 |
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); + } } /* |