Messages in this thread Patch in this message | | | From | "Paul E. McKenney" <> | Subject | [PATCH tip/core/rcu 06/16] rcu: Let the world know when RCU adjusts its geometry | Date | Fri, 15 Nov 2013 16:23:28 -0800 |
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From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
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> --- kernel/rcu/tree.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index acbfead2eb82..875f2a0f9d8d 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -3378,6 +3378,8 @@ 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 -- 1.8.1.5
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