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-rw-r--r--Documentation/RCU/stallwarn.txt6
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/RCU/stallwarn.txt b/Documentation/RCU/stallwarn.txt
index 13e88fc00f01..f48f4621ccbc 100644
--- a/Documentation/RCU/stallwarn.txt
+++ b/Documentation/RCU/stallwarn.txt
@@ -57,6 +57,12 @@ o A CPU-bound real-time task in a CONFIG_PREEMPT_RT kernel that
CONFIG_PREEMPT_RCU case, you might see stall-warning
messages.
+ You can use the rcutree.kthread_prio kernel boot parameter to
+ increase the scheduling priority of RCU's kthreads, which can
+ help avoid this problem. However, please note that doing this
+ can increase your system's context-switch rate and thus degrade
+ performance.
+
o A periodic interrupt whose handler takes longer than the time
interval between successive pairs of interrupts. This can
prevent RCU's kthreads and softirq handlers from running.