--- old/src/hotspot/share/gc/shenandoah/shenandoahRootProcessor.cpp	2019-06-18 13:08:44.652208704 -0400
+++ new/src/hotspot/share/gc/shenandoah/shenandoahRootProcessor.cpp	2019-06-18 13:08:44.320208327 -0400
@@ -35,7 +35,7 @@
 #include "gc/shenandoah/shenandoahStringDedup.hpp"
 #include "gc/shenandoah/shenandoahTimingTracker.hpp"
 #include "gc/shenandoah/shenandoahVMOperations.hpp"
-#include "gc/shared/weakProcessor.inline.hpp"
+#include "jfr/jfr.hpp"
 #include "memory/allocation.inline.hpp"
 #include "memory/iterator.hpp"
 #include "memory/resourceArea.hpp"
@@ -71,6 +71,40 @@
   _jvmti_root.oops_do(cl, worker_id);
 }
 
+ShenandoahWeakSerialRoot::ShenandoahWeakSerialRoot(ShenandoahWeakSerialRoot::WeakOopsDo weak_oops_do, ShenandoahPhaseTimings::GCParPhases phase) :
+  _claimed(false), _weak_oops_do(weak_oops_do), _phase(phase) {
+}
+
+void ShenandoahWeakSerialRoot::weak_oops_do(BoolObjectClosure* is_alive, OopClosure* keep_alive, uint worker_id) {
+  if (!_claimed && Atomic::cmpxchg(true, &_claimed, false) == false) {
+    ShenandoahWorkerTimings* worker_times = ShenandoahHeap::heap()->phase_timings()->worker_times();
+    ShenandoahWorkerTimingsTracker timer(worker_times, _phase, worker_id);
+    _weak_oops_do(is_alive, keep_alive);
+  }
+}
+
+#if INCLUDE_JVMTI
+ShenandoahJVMTIWeakRoot::ShenandoahJVMTIWeakRoot() :
+  ShenandoahWeakSerialRoot(&JvmtiExport::weak_oops_do, ShenandoahPhaseTimings::JVMTIWeakRoots) {
+}
+#endif // INCLUDE_JVMTI
+
+#if INCLUDE_JFR
+ShenandoahJFRWeakRoot::ShenandoahJFRWeakRoot() :
+  ShenandoahWeakSerialRoot(&Jfr::weak_oops_do, ShenandoahPhaseTimings::JFRWeakRoots) {
+}
+#endif // INCLUDE_JFR
+
+void ShenandoahSerialWeakRoots::weak_oops_do(BoolObjectClosure* is_alive, OopClosure* keep_alive, uint worker_id) {
+  JVMTI_ONLY(_jvmti_weak_roots.weak_oops_do(is_alive, keep_alive, worker_id);)
+  JFR_ONLY(_jfr_weak_roots.weak_oops_do(is_alive, keep_alive, worker_id);)
+}
+
+void ShenandoahSerialWeakRoots::weak_oops_do(OopClosure* cl, uint worker_id) {
+  AlwaysTrueClosure always_true;
+  weak_oops_do(&always_true, cl, worker_id);
+}
+
 ShenandoahThreadRoots::ShenandoahThreadRoots(bool is_par) : _is_par(is_par) {
   Threads::change_thread_claim_token();
 }
@@ -93,17 +127,6 @@
   Threads::assert_all_threads_claimed();
 }
 
-ShenandoahWeakRoots::ShenandoahWeakRoots(uint n_workers) :
-  _process_timings(n_workers),
-  _task(&_process_timings, n_workers) {
-}
-
-ShenandoahWeakRoots::~ShenandoahWeakRoots() {
-  ShenandoahWorkerTimings* worker_times = ShenandoahHeap::heap()->phase_timings()->worker_times();
-  ShenandoahTimingConverter::weak_processing_timing_to_shenandoah_timing(&_process_timings,
-                                                                         worker_times);
-}
-
 ShenandoahStringDedupRoots::ShenandoahStringDedupRoots() {
   if (ShenandoahStringDedup::is_enabled()) {
     StringDedup::gc_prologue(false);
@@ -147,7 +170,6 @@
 ShenandoahRootEvacuator::ShenandoahRootEvacuator(uint n_workers, ShenandoahPhaseTimings::Phase phase, bool include_concurrent_roots) :
   ShenandoahRootProcessor(phase),
   _thread_roots(n_workers > 1),
-  _weak_roots(n_workers),
   _include_concurrent_roots(include_concurrent_roots) {
 }
 
@@ -157,29 +179,28 @@
   AlwaysTrueClosure always_true;
 
   _serial_roots.oops_do(oops, worker_id);
+  _serial_weak_roots.weak_oops_do(oops, worker_id);
   if (_include_concurrent_roots) {
     _jni_roots.oops_do<OopClosure>(oops, worker_id);
+    _weak_roots.oops_do<OopClosure>(oops, worker_id);
   }
 
   _thread_roots.oops_do(oops, NULL, worker_id);
   _cld_roots.clds_do(&clds, &clds, worker_id);
   _code_roots.code_blobs_do(&blobsCl, worker_id);
 
-  _weak_roots.oops_do<AlwaysTrueClosure, OopClosure>(&always_true, oops, worker_id);
   _dedup_roots.oops_do(&always_true, oops, worker_id);
 }
 
 ShenandoahRootUpdater::ShenandoahRootUpdater(uint n_workers, ShenandoahPhaseTimings::Phase phase, bool update_code_cache) :
   ShenandoahRootProcessor(phase),
   _thread_roots(n_workers > 1),
-  _weak_roots(n_workers),
   _update_code_cache(update_code_cache) {
 }
 
 ShenandoahRootAdjuster::ShenandoahRootAdjuster(uint n_workers, ShenandoahPhaseTimings::Phase phase) :
   ShenandoahRootProcessor(phase),
-  _thread_roots(n_workers > 1),
-  _weak_roots(n_workers) {
+  _thread_roots(n_workers > 1) {
   assert(ShenandoahHeap::heap()->is_full_gc_in_progress(), "Full GC only");
 }
 
@@ -195,6 +216,7 @@
   _cld_roots.clds_do(&adjust_cld_closure, NULL, worker_id);
   _code_roots.code_blobs_do(&adjust_code_closure, worker_id);
 
-  _weak_roots.oops_do<AlwaysTrueClosure, OopClosure>(&always_true, oops, worker_id);
+  _serial_weak_roots.weak_oops_do(oops, worker_id);
+  _weak_roots.oops_do<OopClosure>(oops, worker_id);
   _dedup_roots.oops_do(&always_true, oops, worker_id);
 }