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-rw-r--r--Documentation/RCU/torture.txt9
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diff --git a/Documentation/RCU/torture.txt b/Documentation/RCU/torture.txt
index 2174badd31e..2180ef93acc 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.