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rcu: Enable diagnostic dump of rcu_node combining tree

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The purpose of this commit is to make it easier to verify that RCU's
combining tree is set up correctly, which is useful to have when making
changes in how that tree is initialized.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Pranith Kumar <bobby.prani@gmail.com>
[ paulmck: Fold fix found by Fengguang's 0-day test robot. ]
This commit is contained in:
Paul E. McKenney
2015-04-20 11:40:50 -07:00
parent 7fa270010e
commit a3dc2948ce
2 changed files with 32 additions and 0 deletions
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5
Documentation/kernel-parameters.txt
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@@ -2992,6 +2992,11 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
Set maximum number of finished RCU callbacks to
process in one batch.
rcutree.dump_tree= [KNL]
Dump the structure of the rcu_node combining tree
out at early boot. This is used for diagnostic
purposes, to verify correct tree setup.
rcutree.gp_cleanup_delay= [KNL]
Set the number of jiffies to delay each step of
RCU grace-period cleanup. This only has effect