Commit 39479098 authored Oct 09, 2013 by Paul E. McKenney

rcu: Let the world know when RCU adjusts its geometry



Some RCU bugs have been specific to the layout of the rcu_node tree,
but RCU will silently adjust the tree at boot time if appropriate.
This obscures valuable debugging information, so print a message when
this happens.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

parent 4461212a

kernel/rcu/tree.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -3391,6 +3391,8 @@ static void __init rcu_init_geometry(void)
		if (rcu_fanout_leaf == CONFIG_RCU_FANOUT_LEAF &&
		nr_cpu_ids == NR_CPUS)
		return;
		pr_info("RCU: Adjusting geometry for rcu_fanout_leaf=%d, nr_cpu_ids=%d\n",
		rcu_fanout_leaf, nr_cpu_ids);

		/*
		* Compute number of nodes that can be handled an rcu_node tree