8297979: ZGC: Ensure consistent MemoryUsage from MemoryMXBean.getHeapMemoryUsage()

Reviewed-by: stefank, ayang

Author: kstefanj

src/hotspot/share/gc/z/zCollectedHeap.cpp

@@ -224,6 +224,10 @@ bool ZCollectedHeap::uses_stack_watermark_barrier() const {
   return true;
 }
 
+MemoryUsage ZCollectedHeap::memory_usage() {
+  return _heap.serviceability_memory_pool()->get_memory_usage();
+}
+
 GrowableArray<GCMemoryManager*> ZCollectedHeap::memory_managers() {
   GrowableArray<GCMemoryManager*> memory_managers(2);
   memory_managers.append(_heap.serviceability_cycle_memory_manager());

src/hotspot/share/gc/z/zCollectedHeap.hpp

@@ -31,6 +31,7 @@
 #include "gc/z/zInitialize.hpp"
 #include "gc/z/zRuntimeWorkers.hpp"
 #include "memory/metaspace.hpp"
+#include "services/memoryUsage.hpp"
 
 class ZDirector;
 class ZDriver;
@@ -90,6 +91,7 @@ class ZCollectedHeap : public CollectedHeap {
 
   virtual bool uses_stack_watermark_barrier() const;
 
+  virtual MemoryUsage memory_usage();
   virtual GrowableArray<GCMemoryManager*> memory_managers();
   virtual GrowableArray<MemoryPool*> memory_pools();
 

test/hotspot/jtreg/ProblemList-zgc.txt

@@ -47,43 +47,6 @@ serviceability/sa/ClhsdbPstack.java#core                      8248912   generic-
 
 vmTestbase/gc/gctests/MemoryEaterMT/MemoryEaterMT.java        8289582   windows-x64
 
-vmTestbase/nsk/monitoring/stress/lowmem/lowmem001/TestDescription.java 8297979 generic-all
-vmTestbase/nsk/monitoring/stress/lowmem/lowmem002/TestDescription.java 8297979 generic-all
-vmTestbase/nsk/monitoring/stress/lowmem/lowmem003/TestDescription.java 8297979 generic-all
-vmTestbase/nsk/monitoring/stress/lowmem/lowmem004/TestDescription.java 8297979 generic-all
-vmTestbase/nsk/monitoring/stress/lowmem/lowmem005/TestDescription.java 8297979 generic-all
-vmTestbase/nsk/monitoring/stress/lowmem/lowmem006/TestDescription.java 8297979 generic-all
-vmTestbase/nsk/monitoring/stress/lowmem/lowmem007/TestDescription.java 8297979 generic-all
-vmTestbase/nsk/monitoring/stress/lowmem/lowmem008/TestDescription.java 8297979 generic-all
-vmTestbase/nsk/monitoring/stress/lowmem/lowmem009/TestDescription.java 8297979 generic-all
-vmTestbase/nsk/monitoring/stress/lowmem/lowmem010/TestDescription.java 8297979 generic-all
-vmTestbase/nsk/monitoring/stress/lowmem/lowmem011/TestDescription.java 8297979 generic-all
-vmTestbase/nsk/monitoring/stress/lowmem/lowmem012/TestDescription.java 8297979 generic-all
-vmTestbase/nsk/monitoring/stress/lowmem/lowmem013/TestDescription.java 8297979 generic-all
-vmTestbase/nsk/monitoring/stress/lowmem/lowmem014/TestDescription.java 8297979 generic-all
-vmTestbase/nsk/monitoring/stress/lowmem/lowmem015/TestDescription.java 8297979 generic-all
-vmTestbase/nsk/monitoring/stress/lowmem/lowmem016/TestDescription.java 8297979 generic-all
-vmTestbase/nsk/monitoring/stress/lowmem/lowmem017/TestDescription.java 8297979 generic-all
-vmTestbase/nsk/monitoring/stress/lowmem/lowmem018/TestDescription.java 8297979 generic-all
-vmTestbase/nsk/monitoring/stress/lowmem/lowmem019/TestDescription.java 8297979 generic-all
-vmTestbase/nsk/monitoring/stress/lowmem/lowmem020/TestDescription.java 8297979 generic-all
-vmTestbase/nsk/monitoring/stress/lowmem/lowmem021/TestDescription.java 8297979 generic-all
-vmTestbase/nsk/monitoring/stress/lowmem/lowmem022/TestDescription.java 8297979 generic-all
-vmTestbase/nsk/monitoring/stress/lowmem/lowmem023/TestDescription.java 8297979 generic-all
-vmTestbase/nsk/monitoring/stress/lowmem/lowmem024/TestDescription.java 8297979 generic-all
-vmTestbase/nsk/monitoring/stress/lowmem/lowmem025/TestDescription.java 8297979 generic-all
-vmTestbase/nsk/monitoring/stress/lowmem/lowmem026/TestDescription.java 8297979 generic-all
-vmTestbase/nsk/monitoring/stress/lowmem/lowmem027/TestDescription.java 8297979 generic-all
-vmTestbase/nsk/monitoring/stress/lowmem/lowmem028/TestDescription.java 8297979 generic-all
-vmTestbase/nsk/monitoring/stress/lowmem/lowmem029/TestDescription.java 8297979 generic-all
-vmTestbase/nsk/monitoring/stress/lowmem/lowmem030/TestDescription.java 8297979 generic-all
-vmTestbase/nsk/monitoring/stress/lowmem/lowmem031/TestDescription.java 8297979 generic-all
-vmTestbase/nsk/monitoring/stress/lowmem/lowmem032/TestDescription.java 8297979 generic-all
-vmTestbase/nsk/monitoring/stress/lowmem/lowmem033/TestDescription.java 8297979 generic-all
-vmTestbase/nsk/monitoring/stress/lowmem/lowmem034/TestDescription.java 8297979 generic-all
-vmTestbase/nsk/monitoring/stress/lowmem/lowmem035/TestDescription.java 8297979 generic-all
-vmTestbase/nsk/monitoring/stress/lowmem/lowmem036/TestDescription.java 8297979 generic-all
-
 vmTestbase/nsk/jdi/ExceptionRequest/addInstanceFilter/instancefilter001/TestDescription.java 8298059 generic-x64
 vmTestbase/nsk/jdi/ExceptionRequest/addInstanceFilter/instancefilter004/TestDescription.java 8298059 generic-x64
 vmTestbase/nsk/monitoring/MemoryPoolMBean/isCollectionUsageThresholdExceeded/isexceeded002/TestDescription.java 8298302 generic-all