Commit-ID: ff3cee39088b1931a432587059d66cd505f785dc
Gitweb: https://git.kernel.org/tip/ff3cee39088b1931a432587059d66cd505f785dc
Author: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
AuthorDate: Tue, 8 May 2018 12:50:14 -0700
Committer: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
CommitDate: Thu, 12 Jul 2018 15:39:08 -0700
rcu: Add up-tree information to dump_blkd_tasks() diagnostics
This commit updates dump_blkd_tasks() to print out quiescent-state
bitmasks for the rcu_node structures further up the tree. This
information helps debugging of interactions between CPU-hotplug
operations and RCU grace-period initialization.
Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
---
kernel/rcu/tree_plugin.h | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
index 6b85ce936ad4..f45ff97b0d51 100644
--- a/kernel/rcu/tree_plugin.h
+++ b/kernel/rcu/tree_plugin.h
@@ -858,13 +858,15 @@ static void dump_blkd_tasks(struct rcu_node *rnp, int ncheck)
{
int i;
struct list_head *lhp;
+ struct rcu_node *rnp1;
raw_lockdep_assert_held_rcu_node(rnp);
- pr_info("%s: grp: %d-%d level: %d ->gp_seq %#lx ->completedqs %#lx\n",
+ pr_info("%s: grp: %d-%d level: %d ->gp_seq %ld ->completedqs %ld\n",
__func__, rnp->grplo, rnp->grphi, rnp->level,
- rnp->gp_seq, rnp->completedqs);
- pr_info("%s: ->qsmask %#lx ->qsmaskinit %#lx ->qsmaskinitnext %#lx\n",
- __func__, rnp->qsmask, rnp->qsmaskinit, rnp->qsmaskinitnext);
+ (long)rnp->gp_seq, (long)rnp->completedqs);
+ for (rnp1 = rnp; rnp1; rnp1 = rnp1->parent)
+ pr_info("%s: %d:%d ->qsmask %#lx ->qsmaskinit %#lx ->qsmaskinitnext %#lx\n",
+ __func__, rnp1->grplo, rnp1->grphi, rnp1->qsmask, rnp1->qsmaskinit, rnp1->qsmaskinitnext);
pr_info("%s: ->gp_tasks %p ->boost_tasks %p ->exp_tasks %p\n",
__func__, rnp->gp_tasks, rnp->boost_tasks, rnp->exp_tasks);
pr_info("%s: ->blkd_tasks", __func__);
--
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