--- old/src/hotspot/share/gc/z/zMark.cpp	2018-09-18 21:51:59.398758535 +0200
+++ new/src/hotspot/share/gc/z/zMark.cpp	2018-09-18 21:51:59.093745382 +0200
@@ -32,6 +32,7 @@
 #include "gc/z/zPageTable.inline.hpp"
 #include "gc/z/zRootsIterator.hpp"
 #include "gc/z/zStat.hpp"
+#include "gc/z/zStatTLAB.hpp"
 #include "gc/z/zTask.hpp"
 #include "gc/z/zThread.hpp"
 #include "gc/z/zUtils.inline.hpp"
@@ -119,11 +120,25 @@
 
 class ZMarkRootsIteratorClosure : public ZRootsIteratorClosure {
 public:
+  ZMarkRootsIteratorClosure() {
+    ZStatTLAB::reset();
+  }
+
+  ~ZMarkRootsIteratorClosure() {
+    ZStatTLAB::publish();
+  }
+
   virtual void do_thread(Thread* thread) {
     ZRootsIteratorClosure::do_thread(thread);
 
     // Update thread local address bad mask
     ZThreadLocalData::set_address_bad_mask(thread, ZAddressBadMask);
+
+    // Retire TLAB
+    if (UseTLAB && thread->is_Java_thread()) {
+      thread->tlab().retire(ZStatTLAB::get());
+      thread->tlab().resize();
+    }
   }
 
   virtual void do_oop(oop* p) {