rcu: Don't initiate RCU priority boosting on root rcu_node

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Because there is no longer any preempted tasks on the root rcu_node, and
because there is no longer ever an rcub kthread for the root rcu_node,
this commit drops the code in force_qs_rnp() that attempts to awaken
the non-existent root rcub kthread.  This is strictly a performance
enhancement, removing a root rcu_node ->lock acquisition and release
along with some tests in rcu_initiate_boost(), ending with the test that
notes that there is no rcub kthread.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

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Paul E. McKenney 2014-11-03 18:20:20 -08:00

parent 3e9f5c70d8

commit 1be0085b51

1 changed files with 0 additions and 6 deletions

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kernel/rcu/tree.c

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