doc: Document the rcutree.rcu_resched_ns module parameter

This commit adds kernel-parameters.txt documentation for the
rcutree.rcu_resched_ns module parameter.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 8a094e2fc381fface1bf38222436a5f9e8dae1ba..c21245c0cce6ce82b0cbbf4e1dfb9b2741296435 100644 (file)
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -4861,6 +4861,13 @@
                        This wake_up() will be accompanied by a
                        WARN_ONCE() splat and an ftrace_dump().
 
+       rcutree.rcu_resched_ns= [KNL]
+                       Limit the time spend invoking a batch of RCU
+                       callbacks to the specified number of nanoseconds.
+                       By default, this limit is checked only once
+                       every 32 callbacks in order to limit the pain
+                       inflicted by local_clock() overhead.
+
        rcutree.rcu_unlock_delay= [KNL]
                        In CONFIG_RCU_STRICT_GRACE_PERIOD=y kernels,
                        this specifies an rcu_read_unlock()-time delay