1 files changed, 9 insertions, 0 deletions

diff --git a/Documentation/RCU/torture.txt b/Documentation/RCU/torture.txt
index 2174badd31e0..2180ef93accc 100644
--- a/Documentation/RCU/torture.txt
+++ b/Documentation/RCU/torture.txt
@@ -28,6 +28,15 @@ nreaders	This is the number of RCU reading threads supported.
                 To properly exercise RCU implementations with preemptible
                 read-side critical sections.
 
+nfakewriters    This is the number of RCU fake writer threads to run.  Fake
+                writer threads repeatedly use the synchronous "wait for
+                current readers" function of the interface selected by
+                torture_type, with a delay between calls to allow for various
+                different numbers of writers running in parallel.
+                nfakewriters defaults to 4, which provides enough parallelism
+                to trigger special cases caused by multiple writers, such as
+                the synchronize_srcu() early return optimization.
+
 stat_interval   The number of seconds between output of torture
                 statistics (via printk()).  Regardless of the interval,
                 statistics are printed when the module is unloaded.