src/hotspot/share/jfr/leakprofiler/leakProfiler.cpp

@@ -32,13 +32,16 @@
  #include "memory/iterator.hpp"
  #include "runtime/javaThread.inline.hpp"
  #include "runtime/vmThread.hpp"
  
  bool LeakProfiler::is_supported() {
-   if (UseShenandoahGC) {
-     // Leak Profiler uses mark words in the ways that might interfere
-     // with concurrent GC uses of them. This affects Shenandoah.
+   if (UseCompactObjectHeaders || UseShenandoahGC) {
+     // 1. With a 32-bit mark word in Lilliput2, we don't have enough unused
+     //    bits to store edge index information in the mark word
+     // 2. Even without compressed object headers, with Shenandoah, we don't
+     //    have enough free bits in the mark word because of needing that
+     //    space for forwarding pointers in the evacuation & update refs phase.
      return false;
    }
    return true;
  }