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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 21b8913acbdf..238acbd94917 100644
--- a/Documentation/RCU/stallwarn.txt
+++ b/Documentation/RCU/stallwarn.txt
@@ -70,6 +70,12 @@ o A periodic interrupt whose handler takes longer than the time
considerably longer than normal, which can in turn result in
RCU CPU stall warnings.
+o Testing a workload on a fast system, tuning the stall-warning
+ timeout down to just barely avoid RCU CPU stall warnings, and then
+ running the same workload with the same stall-warning timeout on a
+ slow system. Note that thermal throttling and on-demand governors
+ can cause a single system to be sometimes fast and sometimes slow!
+
o A hardware or software issue shuts off the scheduler-clock
interrupt on a CPU that is not in dyntick-idle mode. This
problem really has happened, and seems to be most likely to