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rcu: Let the world know when RCU adjusts its geometry

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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>
This commit is contained in:
Paul E. McKenney 2013-10-09 15:20:33 -07:00
parent 4461212aa0
commit 3947909814
1 changed files with 2 additions and 0 deletions
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2
kernel/rcu/tree.c
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@ -3391,6 +3391,8 @@ static void __init rcu_init_geometry(void)
if (rcu_fanout_leaf == CONFIG_RCU_FANOUT_LEAF && if (rcu_fanout_leaf == CONFIG_RCU_FANOUT_LEAF &&
nr_cpu_ids == NR_CPUS) nr_cpu_ids == NR_CPUS)
return; 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 * Compute number of nodes that can be handled an rcu_node tree