src/share/vm/services/virtualMemoryTracker.hpp - toolchain/jdk/jdk9_hotspot - Git at Google

 /*
  * Copyright (c) 2013, 2014, 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.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */

 #ifndef SHARE_VM_SERVICES_VIRTUAL_MEMORY_TRACKER_HPP
 #define SHARE_VM_SERVICES_VIRTUAL_MEMORY_TRACKER_HPP

 #if INCLUDE_NMT

 #include "memory/allocation.hpp"
 #include "services/allocationSite.hpp"
 #include "services/nmtCommon.hpp"
 #include "utilities/linkedlist.hpp"
 #include "utilities/nativeCallStack.hpp"
 #include "utilities/ostream.hpp"


 /*
  * Virtual memory counter
  */
 class VirtualMemory VALUE_OBJ_CLASS_SPEC {
  private:
   size_t     _reserved;
   size_t     _committed;

  public:
   VirtualMemory() : _reserved(0), _committed(0) { }

   inline void reserve_memory(size_t sz) { _reserved += sz; }
   inline void commit_memory (size_t sz) {
     _committed += sz;
     assert(_committed <= _reserved, "Sanity check");
   }

   inline void release_memory (size_t sz) {
     assert(_reserved >= sz, "Negative amount");
     _reserved -= sz;
   }

   inline void uncommit_memory(size_t sz) {
     assert(_committed >= sz, "Negative amount");
     _committed -= sz;
   }

   inline size_t reserved()  const { return _reserved;  }
   inline size_t committed() const { return _committed; }
 };

 // Virtual memory allocation site, keeps track where the virtual memory is reserved.
 class VirtualMemoryAllocationSite : public AllocationSite<VirtualMemory> {
  public:
   VirtualMemoryAllocationSite(const NativeCallStack& stack) :
     AllocationSite<VirtualMemory>(stack) { }

   inline void reserve_memory(size_t sz)  { data()->reserve_memory(sz);  }
   inline void commit_memory (size_t sz)  { data()->commit_memory(sz);   }
   inline void uncommit_memory(size_t sz) { data()->uncommit_memory(sz); }
   inline void release_memory(size_t sz)  { data()->release_memory(sz);  }
   inline size_t reserved() const  { return peek()->reserved(); }
   inline size_t committed() const { return peek()->committed(); }
 };

 class VirtualMemorySummary;

 // This class represents a snapshot of virtual memory at a given time.
 // The latest snapshot is saved in a static area.
 class VirtualMemorySnapshot : public ResourceObj {
   friend class VirtualMemorySummary;

  private:
   VirtualMemory  _virtual_memory[mt_number_of_types];

  public:
   inline VirtualMemory* by_type(MEMFLAGS flag) {
     int index = NMTUtil::flag_to_index(flag);
     return &_virtual_memory[index];
   }

   inline VirtualMemory* by_index(int index) {
     assert(index >= 0, "Index out of bound");
     assert(index < mt_number_of_types, "Index out of bound");
     return &_virtual_memory[index];
   }

   inline size_t total_reserved() const {
     size_t amount = 0;
     for (int index = 0; index < mt_number_of_types; index ++) {
       amount += _virtual_memory[index].reserved();
     }
     return amount;
   }

   inline size_t total_committed() const {
     size_t amount = 0;
     for (int index = 0; index < mt_number_of_types; index ++) {
       amount += _virtual_memory[index].committed();
     }
     return amount;
   }

   void copy_to(VirtualMemorySnapshot* s) {
     for (int index = 0; index < mt_number_of_types; index ++) {
       s->_virtual_memory[index] = _virtual_memory[index];
     }
   }
 };

 class VirtualMemorySummary : AllStatic {
  public:
   static void initialize();

   static inline void record_reserved_memory(size_t size, MEMFLAGS flag) {
     as_snapshot()->by_type(flag)->reserve_memory(size);
   }

   static inline void record_committed_memory(size_t size, MEMFLAGS flag) {
     as_snapshot()->by_type(flag)->commit_memory(size);
   }

   static inline void record_uncommitted_memory(size_t size, MEMFLAGS flag) {
     as_snapshot()->by_type(flag)->uncommit_memory(size);
   }

   static inline void record_released_memory(size_t size, MEMFLAGS flag) {
     as_snapshot()->by_type(flag)->release_memory(size);
   }

   // Move virtual memory from one memory type to another.
   // Virtual memory can be reserved before it is associated with a memory type, and tagged
   // as 'unknown'. Once the memory is tagged, the virtual memory will be moved from 'unknown'
   // type to specified memory type.
   static inline void move_reserved_memory(MEMFLAGS from, MEMFLAGS to, size_t size) {
     as_snapshot()->by_type(from)->release_memory(size);
     as_snapshot()->by_type(to)->reserve_memory(size);
   }

   static inline void move_committed_memory(MEMFLAGS from, MEMFLAGS to, size_t size) {
     as_snapshot()->by_type(from)->uncommit_memory(size);
     as_snapshot()->by_type(to)->commit_memory(size);
   }

   static inline void snapshot(VirtualMemorySnapshot* s) {
     as_snapshot()->copy_to(s);
   }

   static VirtualMemorySnapshot* as_snapshot() {
     return (VirtualMemorySnapshot*)_snapshot;
   }

  private:
   static size_t _snapshot[CALC_OBJ_SIZE_IN_TYPE(VirtualMemorySnapshot, size_t)];
 };


 /*
  * A virtual memory region
  */
 class VirtualMemoryRegion VALUE_OBJ_CLASS_SPEC {
  private:
   address      _base_address;
   size_t       _size;

  public:
   VirtualMemoryRegion(address addr, size_t size) :
     _base_address(addr), _size(size) {
      assert(addr != NULL, "Invalid address");
      assert(size > 0, "Invalid size");
    }

   inline address base() const { return _base_address;   }
   inline address end()  const { return base() + size(); }
   inline size_t  size() const { return _size;           }

   inline bool is_empty() const { return size() == 0; }

   inline bool contain_address(address addr) const {
     return (addr >= base() && addr < end());
   }


   inline bool contain_region(address addr, size_t size) const {
     return contain_address(addr) && contain_address(addr + size - 1);
   }

   inline bool same_region(address addr, size_t sz) const {
     return (addr == base() && sz == size());
   }


   inline bool overlap_region(address addr, size_t sz) const {
     VirtualMemoryRegion rgn(addr, sz);
     return contain_address(addr) ||
            contain_address(addr + sz - 1) ||
            rgn.contain_address(base()) ||
            rgn.contain_address(end() - 1);
   }

   inline bool adjacent_to(address addr, size_t sz) const {
     return (addr == end() || (addr + sz) == base());
   }

   void exclude_region(address addr, size_t sz) {
     assert(contain_region(addr, sz), "Not containment");
     assert(addr == base() || addr + sz == end(), "Can not exclude from middle");
     size_t new_size = size() - sz;

     if (addr == base()) {
       set_base(addr + sz);
     }
     set_size(new_size);
   }

   void expand_region(address addr, size_t sz) {
     assert(adjacent_to(addr, sz), "Not adjacent regions");
     if (base() == addr + sz) {
       set_base(addr);
     }
     set_size(size() + sz);
   }

  protected:
   void set_base(address base) {
     assert(base != NULL, "Sanity check");
     _base_address = base;
   }

   void set_size(size_t  size) {
     assert(size > 0, "Sanity check");
     _size = size;
   }
 };


 class CommittedMemoryRegion : public VirtualMemoryRegion {
  private:
   NativeCallStack  _stack;

  public:
   CommittedMemoryRegion(address addr, size_t size, const NativeCallStack& stack) :
     VirtualMemoryRegion(addr, size), _stack(stack) { }

   inline int compare(const CommittedMemoryRegion& rgn) const {
     if (overlap_region(rgn.base(), rgn.size())) {
       return 0;
     } else {
       if (base() == rgn.base()) {
         return 0;
       } else if (base() > rgn.base()) {
         return 1;
       } else {
         return -1;
       }
     }
   }

   inline bool equals(const CommittedMemoryRegion& rgn) const {
     return compare(rgn) == 0;
   }

   inline void set_call_stack(const NativeCallStack& stack) { _stack = stack; }
   inline const NativeCallStack* call_stack() const         { return &_stack; }
 };


 typedef LinkedListIterator<CommittedMemoryRegion> CommittedRegionIterator;

 int compare_committed_region(const CommittedMemoryRegion&, const CommittedMemoryRegion&);
 class ReservedMemoryRegion : public VirtualMemoryRegion {
  private:
   SortedLinkedList<CommittedMemoryRegion, compare_committed_region>
     _committed_regions;

   NativeCallStack  _stack;
   MEMFLAGS         _flag;

   bool             _all_committed;

  public:
   ReservedMemoryRegion(address base, size_t size, const NativeCallStack& stack,
     MEMFLAGS flag = mtNone) :
     VirtualMemoryRegion(base, size), _stack(stack), _flag(flag),
     _all_committed(false) { }


   ReservedMemoryRegion(address base, size_t size) :
     VirtualMemoryRegion(base, size), _stack(NativeCallStack::empty_stack()), _flag(mtNone),
     _all_committed(false) { }

   // Copy constructor
   ReservedMemoryRegion(const ReservedMemoryRegion& rr) :
     VirtualMemoryRegion(rr.base(), rr.size()) {
     *this = rr;
   }

   inline void  set_call_stack(const NativeCallStack& stack) { _stack = stack; }
   inline const NativeCallStack* call_stack() const          { return &_stack;  }

   void  set_flag(MEMFLAGS flag);
   inline MEMFLAGS flag() const            { return _flag;  }

   inline int compare(const ReservedMemoryRegion& rgn) const {
     if (overlap_region(rgn.base(), rgn.size())) {
       return 0;
     } else {
       if (base() == rgn.base()) {
         return 0;
       } else if (base() > rgn.base()) {
         return 1;
       } else {
         return -1;
       }
     }
   }

   inline bool equals(const ReservedMemoryRegion& rgn) const {
     return compare(rgn) == 0;
   }

   bool    add_committed_region(address addr, size_t size, const NativeCallStack& stack);
   bool    remove_uncommitted_region(address addr, size_t size);

   size_t  committed_size() const;

   // move committed regions that higher than specified address to
   // the new region
   void    move_committed_regions(address addr, ReservedMemoryRegion& rgn);

   inline bool all_committed() const { return _all_committed; }
   void        set_all_committed(bool b);

   CommittedRegionIterator iterate_committed_regions() const {
     return CommittedRegionIterator(_committed_regions.head());
   }

   ReservedMemoryRegion& operator= (const ReservedMemoryRegion& other) {
     set_base(other.base());
     set_size(other.size());

     _stack =         *other.call_stack();
     _flag  =         other.flag();
     _all_committed = other.all_committed();
     if (other.all_committed()) {
       set_all_committed(true);
     } else {
       CommittedRegionIterator itr = other.iterate_committed_regions();
       const CommittedMemoryRegion* rgn = itr.next();
       while (rgn != NULL) {
         _committed_regions.add(*rgn);
         rgn = itr.next();
       }
     }
     return *this;
   }

  private:
   // The committed region contains the uncommitted region, subtract the uncommitted
   // region from this committed region
   bool remove_uncommitted_region(LinkedListNode<CommittedMemoryRegion>* node,
     address addr, size_t sz);

   bool add_committed_region(const CommittedMemoryRegion& rgn) {
     assert(rgn.base() != NULL, "Invalid base address");
     assert(size() > 0, "Invalid size");
     return _committed_regions.add(rgn) != NULL;
   }
 };

 int compare_reserved_region_base(const ReservedMemoryRegion& r1, const ReservedMemoryRegion& r2);

 class VirtualMemoryWalker : public StackObj {
  public:
    virtual bool do_allocation_site(const ReservedMemoryRegion* rgn) { return false; }
 };

 // Main class called from MemTracker to track virtual memory allocations, commits and releases.
 class VirtualMemoryTracker : AllStatic {
  public:
   static bool initialize(NMT_TrackingLevel level);

   // Late phase initialization
   static bool late_initialize(NMT_TrackingLevel level);

   static bool add_reserved_region (address base_addr, size_t size, const NativeCallStack& stack,
     MEMFLAGS flag = mtNone, bool all_committed = false);

   static bool add_committed_region      (address base_addr, size_t size, const NativeCallStack& stack);
   static bool remove_uncommitted_region (address base_addr, size_t size);
   static bool remove_released_region    (address base_addr, size_t size);
   static void set_reserved_region_type  (address addr, MEMFLAGS flag);

   // Walk virtual memory data structure for creating baseline, etc.
   static bool walk_virtual_memory(VirtualMemoryWalker* walker);

   static bool transition(NMT_TrackingLevel from, NMT_TrackingLevel to);

  private:
   static SortedLinkedList<ReservedMemoryRegion, compare_reserved_region_base>* _reserved_regions;
 };


 #endif // INCLUDE_NMT

 #endif // SHARE_VM_SERVICES_VIRTUAL_MEMORY_TRACKER_HPP
	/*
	* Copyright (c) 2013, 2014, 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.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*
	*/

	#ifndef SHARE_VM_SERVICES_VIRTUAL_MEMORY_TRACKER_HPP
	#define SHARE_VM_SERVICES_VIRTUAL_MEMORY_TRACKER_HPP

	#if INCLUDE_NMT

	#include "memory/allocation.hpp"
	#include "services/allocationSite.hpp"
	#include "services/nmtCommon.hpp"
	#include "utilities/linkedlist.hpp"
	#include "utilities/nativeCallStack.hpp"
	#include "utilities/ostream.hpp"


	/*
	* Virtual memory counter
	*/
	class VirtualMemory VALUE_OBJ_CLASS_SPEC {
	private:
	size_t _reserved;
	size_t _committed;

	public:
	VirtualMemory() : _reserved(0), _committed(0) { }

	inline void reserve_memory(size_t sz) { _reserved += sz; }
	inline void commit_memory (size_t sz) {
	_committed += sz;
	assert(_committed <= _reserved, "Sanity check");
	}

	inline void release_memory (size_t sz) {
	assert(_reserved >= sz, "Negative amount");
	_reserved -= sz;
	}

	inline void uncommit_memory(size_t sz) {
	assert(_committed >= sz, "Negative amount");
	_committed -= sz;
	}

	inline size_t reserved() const { return _reserved; }
	inline size_t committed() const { return _committed; }
	};

	// Virtual memory allocation site, keeps track where the virtual memory is reserved.
	class VirtualMemoryAllocationSite : public AllocationSite<VirtualMemory> {
	public:
	VirtualMemoryAllocationSite(const NativeCallStack& stack) :
	AllocationSite<VirtualMemory>(stack) { }

	inline void reserve_memory(size_t sz) { data()->reserve_memory(sz); }
	inline void commit_memory (size_t sz) { data()->commit_memory(sz); }
	inline void uncommit_memory(size_t sz) { data()->uncommit_memory(sz); }
	inline void release_memory(size_t sz) { data()->release_memory(sz); }
	inline size_t reserved() const { return peek()->reserved(); }
	inline size_t committed() const { return peek()->committed(); }
	};

	class VirtualMemorySummary;

	// This class represents a snapshot of virtual memory at a given time.
	// The latest snapshot is saved in a static area.
	class VirtualMemorySnapshot : public ResourceObj {
	friend class VirtualMemorySummary;

	private:
	VirtualMemory _virtual_memory[mt_number_of_types];

	public:
	inline VirtualMemory* by_type(MEMFLAGS flag) {
	int index = NMTUtil::flag_to_index(flag);
	return &_virtual_memory[index];
	}

	inline VirtualMemory* by_index(int index) {
	assert(index >= 0, "Index out of bound");
	assert(index < mt_number_of_types, "Index out of bound");
	return &_virtual_memory[index];
	}

	inline size_t total_reserved() const {
	size_t amount = 0;
	for (int index = 0; index < mt_number_of_types; index ++) {
	amount += _virtual_memory[index].reserved();
	}
	return amount;
	}

	inline size_t total_committed() const {
	size_t amount = 0;
	for (int index = 0; index < mt_number_of_types; index ++) {
	amount += _virtual_memory[index].committed();
	}
	return amount;
	}

	void copy_to(VirtualMemorySnapshot* s) {
	for (int index = 0; index < mt_number_of_types; index ++) {
	s->_virtual_memory[index] = _virtual_memory[index];
	}
	}
	};

	class VirtualMemorySummary : AllStatic {
	public:
	static void initialize();

	static inline void record_reserved_memory(size_t size, MEMFLAGS flag) {
	as_snapshot()->by_type(flag)->reserve_memory(size);
	}

	static inline void record_committed_memory(size_t size, MEMFLAGS flag) {
	as_snapshot()->by_type(flag)->commit_memory(size);
	}

	static inline void record_uncommitted_memory(size_t size, MEMFLAGS flag) {
	as_snapshot()->by_type(flag)->uncommit_memory(size);
	}

	static inline void record_released_memory(size_t size, MEMFLAGS flag) {
	as_snapshot()->by_type(flag)->release_memory(size);
	}

	// Move virtual memory from one memory type to another.
	// Virtual memory can be reserved before it is associated with a memory type, and tagged
	// as 'unknown'. Once the memory is tagged, the virtual memory will be moved from 'unknown'
	// type to specified memory type.
	static inline void move_reserved_memory(MEMFLAGS from, MEMFLAGS to, size_t size) {
	as_snapshot()->by_type(from)->release_memory(size);
	as_snapshot()->by_type(to)->reserve_memory(size);
	}

	static inline void move_committed_memory(MEMFLAGS from, MEMFLAGS to, size_t size) {
	as_snapshot()->by_type(from)->uncommit_memory(size);
	as_snapshot()->by_type(to)->commit_memory(size);
	}

	static inline void snapshot(VirtualMemorySnapshot* s) {
	as_snapshot()->copy_to(s);
	}

	static VirtualMemorySnapshot* as_snapshot() {
	return (VirtualMemorySnapshot*)_snapshot;
	}

	private:
	static size_t _snapshot[CALC_OBJ_SIZE_IN_TYPE(VirtualMemorySnapshot, size_t)];
	};



	/*
	* A virtual memory region
	*/
	class VirtualMemoryRegion VALUE_OBJ_CLASS_SPEC {
	private:
	address _base_address;
	size_t _size;

	public:
	VirtualMemoryRegion(address addr, size_t size) :
	_base_address(addr), _size(size) {
	assert(addr != NULL, "Invalid address");
	assert(size > 0, "Invalid size");
	}

	inline address base() const { return _base_address; }
	inline address end() const { return base() + size(); }
	inline size_t size() const { return _size; }

	inline bool is_empty() const { return size() == 0; }

	inline bool contain_address(address addr) const {
	return (addr >= base() && addr < end());
	}


	inline bool contain_region(address addr, size_t size) const {
	return contain_address(addr) && contain_address(addr + size - 1);
	}

	inline bool same_region(address addr, size_t sz) const {
	return (addr == base() && sz == size());
	}


	inline bool overlap_region(address addr, size_t sz) const {
	VirtualMemoryRegion rgn(addr, sz);
	return contain_address(addr) \|\|
	contain_address(addr + sz - 1) \|\|
	rgn.contain_address(base()) \|\|
	rgn.contain_address(end() - 1);
	}

	inline bool adjacent_to(address addr, size_t sz) const {
	return (addr == end() \|\| (addr + sz) == base());
	}

	void exclude_region(address addr, size_t sz) {
	assert(contain_region(addr, sz), "Not containment");
	assert(addr == base() \|\| addr + sz == end(), "Can not exclude from middle");
	size_t new_size = size() - sz;

	if (addr == base()) {
	set_base(addr + sz);
	}
	set_size(new_size);
	}

	void expand_region(address addr, size_t sz) {
	assert(adjacent_to(addr, sz), "Not adjacent regions");
	if (base() == addr + sz) {
	set_base(addr);
	}
	set_size(size() + sz);
	}

	protected:
	void set_base(address base) {
	assert(base != NULL, "Sanity check");
	_base_address = base;
	}

	void set_size(size_t size) {
	assert(size > 0, "Sanity check");
	_size = size;
	}
	};


	class CommittedMemoryRegion : public VirtualMemoryRegion {
	private:
	NativeCallStack _stack;

	public:
	CommittedMemoryRegion(address addr, size_t size, const NativeCallStack& stack) :
	VirtualMemoryRegion(addr, size), _stack(stack) { }

	inline int compare(const CommittedMemoryRegion& rgn) const {
	if (overlap_region(rgn.base(), rgn.size())) {
	return 0;
	} else {
	if (base() == rgn.base()) {
	return 0;
	} else if (base() > rgn.base()) {
	return 1;
	} else {
	return -1;
	}
	}
	}

	inline bool equals(const CommittedMemoryRegion& rgn) const {
	return compare(rgn) == 0;
	}

	inline void set_call_stack(const NativeCallStack& stack) { _stack = stack; }
	inline const NativeCallStack* call_stack() const { return &_stack; }
	};


	typedef LinkedListIterator<CommittedMemoryRegion> CommittedRegionIterator;

	int compare_committed_region(const CommittedMemoryRegion&, const CommittedMemoryRegion&);
	class ReservedMemoryRegion : public VirtualMemoryRegion {
	private:
	SortedLinkedList<CommittedMemoryRegion, compare_committed_region>
	_committed_regions;

	NativeCallStack _stack;
	MEMFLAGS _flag;

	bool _all_committed;

	public:
	ReservedMemoryRegion(address base, size_t size, const NativeCallStack& stack,
	MEMFLAGS flag = mtNone) :
	VirtualMemoryRegion(base, size), _stack(stack), _flag(flag),
	_all_committed(false) { }


	ReservedMemoryRegion(address base, size_t size) :
	VirtualMemoryRegion(base, size), _stack(NativeCallStack::empty_stack()), _flag(mtNone),
	_all_committed(false) { }

	// Copy constructor
	ReservedMemoryRegion(const ReservedMemoryRegion& rr) :
	VirtualMemoryRegion(rr.base(), rr.size()) {
	*this = rr;
	}

	inline void set_call_stack(const NativeCallStack& stack) { _stack = stack; }
	inline const NativeCallStack* call_stack() const { return &_stack; }

	void set_flag(MEMFLAGS flag);
	inline MEMFLAGS flag() const { return _flag; }

	inline int compare(const ReservedMemoryRegion& rgn) const {
	if (overlap_region(rgn.base(), rgn.size())) {
	return 0;
	} else {
	if (base() == rgn.base()) {
	return 0;
	} else if (base() > rgn.base()) {
	return 1;
	} else {
	return -1;
	}
	}
	}

	inline bool equals(const ReservedMemoryRegion& rgn) const {
	return compare(rgn) == 0;
	}

	bool add_committed_region(address addr, size_t size, const NativeCallStack& stack);
	bool remove_uncommitted_region(address addr, size_t size);

	size_t committed_size() const;

	// move committed regions that higher than specified address to
	// the new region
	void move_committed_regions(address addr, ReservedMemoryRegion& rgn);

	inline bool all_committed() const { return _all_committed; }
	void set_all_committed(bool b);

	CommittedRegionIterator iterate_committed_regions() const {
	return CommittedRegionIterator(_committed_regions.head());
	}

	ReservedMemoryRegion& operator= (const ReservedMemoryRegion& other) {
	set_base(other.base());
	set_size(other.size());

	_stack = *other.call_stack();
	_flag = other.flag();
	_all_committed = other.all_committed();
	if (other.all_committed()) {
	set_all_committed(true);
	} else {
	CommittedRegionIterator itr = other.iterate_committed_regions();
	const CommittedMemoryRegion* rgn = itr.next();
	while (rgn != NULL) {
	_committed_regions.add(*rgn);
	rgn = itr.next();
	}
	}
	return *this;
	}

	private:
	// The committed region contains the uncommitted region, subtract the uncommitted
	// region from this committed region
	bool remove_uncommitted_region(LinkedListNode<CommittedMemoryRegion>* node,
	address addr, size_t sz);

	bool add_committed_region(const CommittedMemoryRegion& rgn) {
	assert(rgn.base() != NULL, "Invalid base address");
	assert(size() > 0, "Invalid size");
	return _committed_regions.add(rgn) != NULL;
	}
	};

	int compare_reserved_region_base(const ReservedMemoryRegion& r1, const ReservedMemoryRegion& r2);

	class VirtualMemoryWalker : public StackObj {
	public:
	virtual bool do_allocation_site(const ReservedMemoryRegion* rgn) { return false; }
	};

	// Main class called from MemTracker to track virtual memory allocations, commits and releases.
	class VirtualMemoryTracker : AllStatic {
	public:
	static bool initialize(NMT_TrackingLevel level);

	// Late phase initialization
	static bool late_initialize(NMT_TrackingLevel level);

	static bool add_reserved_region (address base_addr, size_t size, const NativeCallStack& stack,
	MEMFLAGS flag = mtNone, bool all_committed = false);

	static bool add_committed_region (address base_addr, size_t size, const NativeCallStack& stack);
	static bool remove_uncommitted_region (address base_addr, size_t size);
	static bool remove_released_region (address base_addr, size_t size);
	static void set_reserved_region_type (address addr, MEMFLAGS flag);

	// Walk virtual memory data structure for creating baseline, etc.
	static bool walk_virtual_memory(VirtualMemoryWalker* walker);

	static bool transition(NMT_TrackingLevel from, NMT_TrackingLevel to);

	private:
	static SortedLinkedList<ReservedMemoryRegion, compare_reserved_region_base>* _reserved_regions;
	};


	#endif // INCLUDE_NMT

	#endif // SHARE_VM_SERVICES_VIRTUAL_MEMORY_TRACKER_HPP