diff -r f2f7cb0f1a0f -r dc5746ce3b92 src/hotspot/share/jfr/leakprofiler/checkpoint/objectSampleCheckpoint.cpp
--- 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");