*** old/src/share/vm/services/lowMemoryDetector.hpp	Fri Jan 28 11:13:07 2011
--- new/src/share/vm/services/lowMemoryDetector.hpp	Fri Jan 28 11:13:07 2011

*** 1,7 ****
--- 1,7 ----
  /*
!  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
!  * Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.

*** 56,67 ****
--- 56,67 ----
  // For Code cache, detection will be performed in the allocation
  // and deallocation.
  //
  // May need to deal with hysteresis effect.
  //
+ // Memory detection code runs in the Service thread (serviceThread.hpp).
  
  class LowMemoryDetectorThread;
  class OopClosure;
  class MemoryPool;
  
  class ThresholdSupport : public CHeapObj {
   private:

*** 209,235 ****
--- 209,234 ----
    void print();
  #endif // PRODUCT
  };
  
  class LowMemoryDetector : public AllStatic {
!   friend class LowMemoryDetectorDisabler;
+   friend class ServiceThread;
  private:
    // true if any collected heap has low memory detection enabled
    static volatile bool _enabled_for_collected_pools;
    // > 0 if temporary disabed
    static volatile jint _disabled_count;
  
    static LowMemoryDetectorThread* _detector_thread;
    static void low_memory_detector_thread_entry(JavaThread* thread, TRAPS);
    static void check_memory_usage();
    static bool has_pending_requests();
    static bool temporary_disabled() { return _disabled_count > 0; }
    static void disable() { Atomic::inc(&_disabled_count); }
    static void enable() { Atomic::dec(&_disabled_count); }
+   static void process_sensor_changes(TRAPS);
  
  public:
    static void initialize();
    static void detect_low_memory();
    static void detect_low_memory(MemoryPool* pool);
    static void detect_after_gc_memory(MemoryPool* pool);
  
    static bool is_enabled(MemoryPool* pool) {

*** 273,283 ****
--- 272,281 ----
            detect_low_memory(pool);
          }
        }
      }
    }
  
  };
  
  class LowMemoryDetectorDisabler: public StackObj {
  public:
    LowMemoryDetectorDisabler()