defer/rcuintro: Add citation of real-time fixed-duration grace periods
Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
diff --git a/defer/rcuintro.tex b/defer/rcuintro.tex
index fb5d8d0..5633818 100644
--- a/defer/rcuintro.tex
+++ b/defer/rcuintro.tex
@@ -204,7 +204,8 @@
A third approach is to simply wait for a fixed period of time that is
long enough to comfortably exceed the lifetime of any reasonable
reader~\cite{Jacobson93,AjuJohn95}.
-This can work quite well in hard real-time systems, but in less exotic
+This can work quite well in hard real-time systems~\cite{YuxinRen2018RTRCU},
+but in less exotic
settings, Murphy says that it is critically important to be prepared
even for unreasonably long-lived readers.
To see this, consider the consequences of failing to wait long enough:
