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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2013-10-09 15:20:33 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2013-12-03 10:10:19 -0800 |
| commit | 3947909814f38d524829bc41bd4c11068a15f0cd (patch) | |
| tree | 6bc166cc6eb9859ae608378cb63b3fd870295a8f /kernel/rcu | |
| parent | 4461212aa0c604c5214856f0ae10a2b335f7e73a (diff) | |
| download | blackbird-obmc-linux-3947909814f38d524829bc41bd4c11068a15f0cd.tar.gz blackbird-obmc-linux-3947909814f38d524829bc41bd4c11068a15f0cd.zip | |
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.c | 2 |
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 |
