--- a/src/hotspot/share/services/mallocTracker.hpp	Tue Nov 26 13:50:26 2019 +0100
+++ b/src/hotspot/share/services/mallocTracker.hpp	Tue Nov 26 09:27:16 2019 -0500
@@ -70,8 +70,9 @@
     }
   }
 
-  inline void resize(long sz) {
+  inline void resize(ssize_t sz) {
     if (sz != 0) {
+      assert(sz >= 0 || _size >= size_t(-sz), "Must be");
       Atomic::add(&_size, size_t(sz));
       DEBUG_ONLY(_peak_size = MAX2(_size, _peak_size);)
     }
@@ -113,7 +114,7 @@
     _arena.deallocate(0);
   }
 
-  inline void record_arena_size_change(long sz) {
+  inline void record_arena_size_change(ssize_t sz) {
     _arena.resize(sz);
   }
 
@@ -207,7 +208,7 @@
      as_snapshot()->by_type(flag)->record_arena_free();
    }
 
-   static inline void record_arena_size_change(long size, MEMFLAGS flag) {
+   static inline void record_arena_size_change(ssize_t size, MEMFLAGS flag) {
      as_snapshot()->by_type(flag)->record_arena_size_change(size);
    }
 
@@ -361,7 +362,7 @@
     MallocMemorySummary::record_arena_free(flags);
   }
 
-  static inline void record_arena_size_change(int size, MEMFLAGS flags) {
+  static inline void record_arena_size_change(ssize_t size, MEMFLAGS flags) {
     MallocMemorySummary::record_arena_size_change(size, flags);
   }
  private: