diff -r 8d8702585652 -r d2a3503c72f7 src/hotspot/share/utilities/singleWriterSynchronizer.hpp
--- a/src/hotspot/share/utilities/singleWriterSynchronizer.hpp	Tue Oct 30 14:38:59 2018 -0700
+++ b/src/hotspot/share/utilities/singleWriterSynchronizer.hpp	Tue Oct 30 18:06:35 2018 -0400
@@ -36,7 +36,7 @@
 // Any number of threads may enter critical sections associated with a
 // synchronizer object.  One (at a time) other thread may wait for the
 // completion of all critical sections for the synchronizer object
-// that were extent when the wait was initiated.  Usage is that there
+// that were extant when the wait was initiated.  Usage is that there
 // is some state that can be accessed either before or after some
 // change.  An accessing thread performs the access within a critical
 // section.  A writer thread performs the state change, and then waits
@@ -46,9 +46,7 @@
 // Generally, GlobalCounter should be used instead of this class, as
 // GlobalCounter has measurably better performance and doesn't have
 // the single writer at a time restriction.  Use this only in
-// situations where GlobalCounter won't work for some reason, such as
-// nesting.  But note that nesting often indicates other problems, and
-// may risk deadlock.
+// situations where GlobalCounter won't work for some reason.
 class SingleWriterSynchronizer {
   volatile uint _enter;
   volatile uint _exit[2];