src/share/vm/prims/whitebox.cpp

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rev 3901 : JDK-8005012: Add WB APIs to better support NMT testing
Summary:

@@ -41,10 +41,14 @@
 #include "gc_implementation/g1/concurrentMark.hpp"
 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
 #include "gc_implementation/g1/heapRegionRemSet.hpp"
 #endif // !SERIALGC
 
+#ifdef INCLUDE_NMT
+#include "services/memTracker.hpp"
+#endif // INCLUDE_NMT
+
 bool WhiteBox::_used = false;
 
 WB_ENTRY(jlong, WB_GetObjectAddress(JNIEnv* env, jobject o, jobject obj))
   return (jlong)(void*)JNIHandles::resolve(obj);
 WB_END

@@ -108,10 +112,64 @@
 WB_ENTRY(jint, WB_G1RegionSize(JNIEnv* env, jobject o))
   return (jint)HeapRegion::GrainBytes;
 WB_END
 #endif // !SERIALGC
 
+#ifdef INCLUDE_NMT
+// Keep track of the 3 allocations in NMTAllocTest so we can free them later
+// on and verify that they're not visible anymore
+static void* nmtMtTest1 = NULL, *nmtMtTest2 = NULL, *nmtMtTest3 = NULL;
+
+// Alloc memory using the test memory type so that we can use that to see if 
+// NMT picks it up correctly
+WB_ENTRY(jboolean, WB_NMTAllocTest(JNIEnv* env)) 
+  void *mem;
+
+  if (!MemTracker::is_on() || MemTracker::shutdown_in_progress()) {
+    return false;
+  }
+
+  // Allocate 2 * 128k + 256k + 1024k and free the 1024k one to make sure we track 
+  // everything correctly. Total should be 512k held alive.
+  nmtMtTest1 = os::malloc(128 * 1024, mtTest);
+  mem = os::malloc(1024 * 1024, mtTest);
+  nmtMtTest2 = os::malloc(256 * 1024, mtTest);
+  os::free(mem, mtTest);
+  nmtMtTest3 = os::malloc(128 * 1024, mtTest);
+
+  return true;
+WB_END
+
+// Free the memory allocated by NMTAllocTest
+WB_ENTRY(jboolean, WB_NMTFreeTestMemory(JNIEnv* env))
+  
+  if (nmtMtTest1 == NULL || nmtMtTest2 == NULL || nmtMtTest3 == NULL) {
+    return false;
+  }
+
+  os::free(nmtMtTest1, mtTest);
+  nmtMtTest1 = NULL;
+  os::free(nmtMtTest2, mtTest);
+  nmtMtTest2 = NULL;
+  os::free(nmtMtTest3, mtTest);
+  nmtMtTest3 = NULL;
+
+  return true;
+WB_END
+
+// Block until the current generation of NMT data to be merged, used to reliably test the NMT feature
+WB_ENTRY(jboolean, WB_NMTWaitForDataMerge(JNIEnv* env))
+  
+  if (!MemTracker::is_on() || MemTracker::shutdown_in_progress()) {
+    return false;
+  }  
+
+  return MemTracker::wbtest_wait_for_data_merge();
+WB_END
+
+#endif // INCLUDE_NMT
+
 //Some convenience methods to deal with objects from java
 int WhiteBox::offset_for_field(const char* field_name, oop object,
     Symbol* signature_symbol) {
   assert(field_name != NULL && strlen(field_name) > 0, "Field name not valid");
   Thread* THREAD = Thread::current();

@@ -175,10 +233,15 @@
   {CC"g1InConcurrentMark", CC"()Z",                   (void*)&WB_G1InConcurrentMark},
   {CC"g1IsHumongous",      CC"(Ljava/lang/Object;)Z", (void*)&WB_G1IsHumongous     },
   {CC"g1NumFreeRegions",   CC"()J",                   (void*)&WB_G1NumFreeRegions  },
   {CC"g1RegionSize",       CC"()I",                   (void*)&WB_G1RegionSize      },
 #endif // !SERIALGC
+#ifdef INCLUDE_NMT
+  {CC"NMTAllocTest",       CC"()Z",                   (void*)&WB_NMTAllocTest      },
+  {CC"NMTFreeTestMemory",  CC"()Z",                   (void*)&WB_NMTFreeTestMemory },
+  {CC"NMTWaitForDataMerge",CC"()Z",                   (void*)&WB_NMTWaitForDataMerge},
+#endif // INCLUDE_NMT
 };
 
 #undef CC
 
 JVM_ENTRY(void, JVM_RegisterWhiteBoxMethods(JNIEnv* env, jclass wbclass))