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Commit ff3cee39 authored by Paul E. McKenney's avatar Paul E. McKenney
Browse files

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: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
parent e05121ba

kernel/rcu/tree_plugin.h

+6 −4
Original line number Diff line number Diff line
@@ -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__);