src/share/vm/runtime/thread.hpp

rev 6875 : 8056240: Investigate increased GC remark time after class unloading changes in CRM Fuse
Reviewed-by: mgerdin, coleenp, bdelsart

@@ -40,15 +40,14 @@
 #include "runtime/safepoint.hpp"
 #include "runtime/stubRoutines.hpp"
 #include "runtime/threadLocalStorage.hpp"
 #include "runtime/thread_ext.hpp"
 #include "runtime/unhandledOops.hpp"
-#include "utilities/macros.hpp"
-
 #include "trace/traceBackend.hpp"
 #include "trace/traceMacros.hpp"
 #include "utilities/exceptions.hpp"
+#include "utilities/macros.hpp"
 #include "utilities/top.hpp"
 #if INCLUDE_ALL_GCS
 #include "gc_implementation/g1/dirtyCardQueue.hpp"
 #include "gc_implementation/g1/satbQueue.hpp"
 #endif // INCLUDE_ALL_GCS

@@ -81,10 +80,14 @@
 
 class GCTaskQueue;
 class ThreadClosure;
 class IdealGraphPrinter;
 
+class Metadata;
+template <class T, MEMFLAGS F> class ChunkedList;
+typedef ChunkedList<Metadata*, mtInternal> MetadataOnStackBuffer;
+
 DEBUG_ONLY(class ResourceMark;)
 
 class WorkerThread;
 
 // Class hierarchy

@@ -254,10 +257,13 @@
 
   ThreadLocalAllocBuffer _tlab;                 // Thread-local eden
   jlong _allocated_bytes;                       // Cumulative number of bytes allocated on
                                                 // the Java heap
 
+  // Thread-local buffer used by MetadataOnStackMark.
+  MetadataOnStackBuffer* _metadata_on_stack_buffer;
+
   TRACE_DATA _trace_data;                       // Thread-local data for tracing
 
   ThreadExt _ext;
 
   int   _vm_operation_started_count;            // VM_Operation support

@@ -515,11 +521,14 @@
 
   // Sets this thread as starting thread. Returns failure if thread
   // creation fails due to lack of memory, too many threads etc.
   bool set_as_starting_thread();
 
- protected:
+  void set_metadata_on_stack_buffer(MetadataOnStackBuffer* buffer) { _metadata_on_stack_buffer = buffer; }
+  MetadataOnStackBuffer* metadata_on_stack_buffer() const          { return _metadata_on_stack_buffer; }
+
+protected:
   // OS data associated with the thread
   OSThread* _osthread;  // Platform-specific thread information
 
   // Thread local resource area for temporary allocation within the VM
   ResourceArea* _resource_area;