src/share/vm/runtime/thread.hpp

*** 813,822 ****
--- 813,825 ----
   private:  // restore original namespace restriction
  #endif
  
    JavaFrameAnchor _anchor;                       // Encapsulation of current java frame and it state
  
+   size_t _bytes_until_sample;                    // Thread local counter to determine when to sample
+                                                  // allocations.
+ 
    ThreadFunction _entry_point;
  
    JNIEnv        _jni_environment;
  
    // Deopt support
*** 1100,1109 ****
--- 1103,1115 ----
  
    // last_Java_pc
  
    address last_Java_pc(void)                     { return _anchor.last_Java_pc(); }
  
+   // Bytes until next heap sample.
+   size_t* bytes_until_sample()                   { return &_bytes_until_sample; }
+ 
    // Safepoint support
  #if !(defined(PPC64) || defined(AARCH64))
    JavaThreadState thread_state() const           { return _thread_state; }
    void set_thread_state(JavaThreadState s)       { _thread_state = s;    }
  #else
*** 1552,1561 ****
--- 1558,1568 ----
      return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset();
    }
    static ByteSize frame_anchor_offset() {
      return byte_offset_of(JavaThread, _anchor);
    }
+   static ByteSize bytes_until_sample_offset()    { return byte_offset_of(JavaThread, _bytes_until_sample); }
    static ByteSize callee_target_offset()         { return byte_offset_of(JavaThread, _callee_target); }
    static ByteSize vm_result_offset()             { return byte_offset_of(JavaThread, _vm_result); }
    static ByteSize vm_result_2_offset()           { return byte_offset_of(JavaThread, _vm_result_2); }
    static ByteSize thread_state_offset()          { return byte_offset_of(JavaThread, _thread_state); }
    static ByteSize saved_exception_pc_offset()    { return byte_offset_of(JavaThread, _saved_exception_pc); }