1 files changed, 8 insertions, 0 deletions

diff --git a/Documentation/RCU/torture.txt b/Documentation/RCU/torture.txt
index af40929e1cb0..d67068d0d2b9 100644
--- a/Documentation/RCU/torture.txt
+++ b/Documentation/RCU/torture.txt
@@ -61,6 +61,14 @@ nreaders	This is the number of RCU reading threads supported.
                 To properly exercise RCU implementations with preemptible
                 read-side critical sections.
 
+onoff_interval
+                The number of seconds between each attempt to execute a
+                randomly selected CPU-hotplug operation.  Defaults to
+                zero, which disables CPU hotplugging.  In HOTPLUG_CPU=n
+                kernels, rcutorture will silently refuse to do any
+                CPU-hotplug operations regardless of what value is
+                specified for onoff_interval.
+
 shuffle_interval
                 The number of seconds to keep the test threads affinitied
                 to a particular subset of the CPUs, defaults to 3 seconds.