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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2013-10-09 15:20:33 -0700
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2013-12-03 10:10:19 -0800
commit3947909814f38d524829bc41bd4c11068a15f0cd (patch)
tree6bc166cc6eb9859ae608378cb63b3fd870295a8f /kernel/rcu
parent4461212aa0c604c5214856f0ae10a2b335f7e73a (diff)
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>
Diffstat (limited to 'kernel/rcu')
-rw-r--r--kernel/rcu/tree.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 518e08428b2e..30499508c72e 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -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