diff -r 5389598424cc -r 2758de6e8b3c hotspot/src/share/vm/gc/shared/spaceDecorator.cpp
--- a/hotspot/src/share/vm/gc/shared/spaceDecorator.cpp	Fri Mar 18 03:46:02 2016 +0100
+++ b/hotspot/src/share/vm/gc/shared/spaceDecorator.cpp	Fri Mar 18 08:57:57 2016 +0100
@@ -84,9 +84,7 @@
 void SpaceMangler::mangle_region(MemRegion mr) {
   assert(ZapUnusedHeapArea, "Mangling should not be in use");
 #ifdef ASSERT
-  log_develop_trace(gc)("Mangling [" PTR_FORMAT " to " PTR_FORMAT ")", p2i(mr.start()), p2i(mr.end()));
   Copy::fill_to_words(mr.start(), mr.word_size(), badHeapWord);
-  log_develop_trace(gc)("Mangling done.");
 #endif
 }