8261238: NMT should not limit baselining by size threshold

Backport-of: 578a0b3

Author: tstuefe

src/hotspot/share/services/memBaseline.cpp

@@ -95,15 +95,15 @@ class MallocAllocationSiteWalker : public MallocSiteWalker {
   }
 
   bool do_malloc_site(const MallocSite* site) {
-    if (site->size() >= MemBaseline::SIZE_THRESHOLD) {
+    if (site->size() > 0) {
       if (_malloc_sites.add(*site) != NULL) {
         _count++;
         return true;
       } else {
         return false;  // OOM
       }
     } else {
-      // malloc site does not meet threshold, ignore and continue
+      // Ignore empty sites.
       return true;
     }
   }
@@ -125,15 +125,17 @@ class VirtualMemoryAllocationWalker : public VirtualMemoryWalker {
   VirtualMemoryAllocationWalker() : _count(0) { }
 
   bool do_allocation_site(const ReservedMemoryRegion* rgn)  {
-    if (rgn->size() >= MemBaseline::SIZE_THRESHOLD) {
+    if (rgn->size() > 0) {
       if (_virtual_memory_regions.add(*rgn) != NULL) {
         _count ++;
         return true;
       } else {
         return false;
       }
+    } else {
+      // Ignore empty sites.
+      return true;
     }
-    return true;
   }
 
   LinkedList<ReservedMemoryRegion>* virtual_memory_allocations() {

src/hotspot/share/services/memBaseline.hpp

@@ -43,9 +43,6 @@ typedef LinkedListIterator<ReservedMemoryRegion>         VirtualMemoryAllocation
  */
 class MemBaseline {
  public:
-  enum BaselineThreshold {
-    SIZE_THRESHOLD = K        // Only allocation size over this threshold will be baselined.
-  };
 
   enum BaselineType {
     Not_baselined,