[PATCH 15/16] rcu: Check for a nocb cpu before trying to spawn nocb threads

Pranith Kumar
2014-07-23T05:11:40Z

This commit tries to spawn nocb kthreads only when the CPU is marked as a nocb
cpu. This is a minor optimization.

Signed-off-by: Pranith Kumar <bobby.prani@gmail.com>
---
kernel/rcu/tree_plugin.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
index 541c776..8abff0a 100644
--- a/kernel/rcu/tree_plugin.h
+++ b/kernel/rcu/tree_plugin.h
@@ -1490,7 +1490,8 @@ static void rcu_prepare_kthreads(int cpu)
return;

rcu_spawn_one_boost_kthread(rcu_state_p, rnp);
- rcu_spawn_all_nocb_kthreads(cpu);
+ if (rcu_is_nocb_cpu(cpu))
+ rcu_spawn_all_nocb_kthreads(cpu);
}

#else /* #ifdef CONFIG_RCU_BOOST */
--
2.0.0.rc2