--- a/src/hotspot/share/jfr/leakprofiler/checkpoint/objectSampleCheckpoint.cpp	Tue Sep 03 15:01:20 2019 +0200
+++ b/src/hotspot/share/jfr/leakprofiler/checkpoint/objectSampleCheckpoint.cpp	Tue Sep 03 16:25:05 2019 +0200
@@ -270,7 +270,7 @@
   id_set = new GrowableArray<traceid>(JfrOptionSet::old_object_queue_size());
 }
 
-static void resolve_stack_traces(ObjectSampler* sampler, JfrStackTraceRepository& stack_trace_repo) {
+static void resolve_stack_traces(const ObjectSampler* sampler, JfrStackTraceRepository& stack_trace_repo) {
   assert(sampler != NULL, "invariant");
   const ObjectSample* const last = sampler->last();
   if (last != sampler->last_resolved()) {
@@ -281,7 +281,7 @@
 }
 
 // caller needs ResourceMark
-void ObjectSampleCheckpoint::on_rotation(ObjectSampler* sampler, JfrStackTraceRepository& stack_trace_repo) {
+void ObjectSampleCheckpoint::on_rotation(const ObjectSampler* sampler, JfrStackTraceRepository& stack_trace_repo) {
   assert(sampler != NULL, "invariant");
   assert(LeakProfiler::is_running(), "invariant");
   resolve_stack_traces(sampler, stack_trace_repo);
@@ -387,7 +387,7 @@
   iterate_samples(cbw, true);
 }
 
-void ObjectSampleCheckpoint::write(ObjectSampler* sampler, EdgeStore* edge_store, bool emit_all, Thread* thread) {
+void ObjectSampleCheckpoint::write(const ObjectSampler* sampler, EdgeStore* edge_store, bool emit_all, Thread* thread) {
   assert(sampler != NULL, "invariant");
   assert(edge_store != NULL, "invariant");
   assert(thread != NULL, "invariant");

--- a/src/hotspot/share/jfr/leakprofiler/checkpoint/objectSampleCheckpoint.hpp	Tue Sep 03 15:01:20 2019 +0200
+++ b/src/hotspot/share/jfr/leakprofiler/checkpoint/objectSampleCheckpoint.hpp	Tue Sep 03 16:25:05 2019 +0200
@@ -47,14 +47,13 @@
   static void add_to_leakp_set(const Method* method, traceid method_id);
   static int save_mark_words(const ObjectSampler* sampler, ObjectSampleMarker& marker, bool emit_all);
   static void write_stacktrace(const JfrStackTrace* trace, JfrCheckpointWriter& writer);
-  static void write(ObjectSampler* sampler, EdgeStore* edge_store, bool emit_all, Thread* thread);
+  static void write(const ObjectSampler* sampler, EdgeStore* edge_store, bool emit_all, Thread* thread);
  public:
   static void on_klass_unload(const Klass* k);
   static void on_type_set(JfrCheckpointWriter& writer);
   static void on_type_set_unload(JfrCheckpointWriter& writer);
   static void on_thread_exit(JavaThread* jt);
-  static void on_rotation(ObjectSampler* sampler, JfrStackTraceRepository& repo);
+  static void on_rotation(const ObjectSampler* sampler, JfrStackTraceRepository& repo);
 };
 
 #endif // SHARE_JFR_LEAKPROFILER_CHECKPOINT_OBJECTSAMPLECHECKPOINT_HPP
-