Merge tag 'arc-4.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc

[mirror_ubuntu-bionic-kernel.git] / Documentation / RCU / rcubarrier.txt

diff --git a/Documentation/RCU/rcubarrier.txt b/Documentation/RCU/rcubarrier.txt
index b10cfe711e68e48fe6d516ea531126dfc947fc13..5d7759071a3edbb3ef818e0d41a7081f39dc54ea 100644 (file)
--- a/Documentation/RCU/rcubarrier.txt
+++ b/Documentation/RCU/rcubarrier.txt
@@ -263,6 +263,11 @@ Quick Quiz #2: What happens if CPU 0's rcu_barrier_func() executes
        are delayed for a full grace period? Couldn't this result in
        rcu_barrier() returning prematurely?
 
+The current rcu_barrier() implementation is more complex, due to the need
+to avoid disturbing idle CPUs (especially on battery-powered systems)
+and the need to minimally disturb non-idle CPUs in real-time systems.
+However, the code above illustrates the concepts.
+
 
 rcu_barrier() Summary