--- a/src/share/vm/services/memTracker.hpp	Wed Aug 27 09:36:55 2014 +0200
+++ b/src/share/vm/services/memTracker.hpp	Wed Aug 27 08:19:12 2014 -0400
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
+ * 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
@@ -25,574 +25,289 @@
 #ifndef SHARE_VM_SERVICES_MEM_TRACKER_HPP
 #define SHARE_VM_SERVICES_MEM_TRACKER_HPP
 
-#include "utilities/macros.hpp"
+#include "services/nmtCommon.hpp"
+
+class NativeCallStack;
+extern NativeCallStack emptyStack;
 
 #if !INCLUDE_NMT
 
-#include "utilities/ostream.hpp"
+#define CURRENT_PC   emptyStack
+#define CALLER_PC    emptyStack
 
-class BaselineOutputer : public StackObj {
-
+class Tracker : public StackObj {
+ public:
+  Tracker() { }
+  void record(address addr, size_t size) { }
 };
 
-class BaselineTTYOutputer : public BaselineOutputer {
-  public:
-    BaselineTTYOutputer(outputStream* st) { }
+class MemTracker : AllStatic {
+ public:
+  static inline NMT_TrackingLevel tracking_level() { return NMT_off; }
+  static inline void shutdown() { }
+  static inline void init() { }
+  static bool check_launcher_nmt_support(const char* value) { return true; }
+  static bool verify_nmt_option() { return true; }
+
+  static inline void* record_malloc(void* mem_base, size_t size, MEMFLAGS flag,
+    const NativeCallStack& stack, NMT_TrackingLevel level) { return mem_base; }
+  static inline size_t malloc_header_size(NMT_TrackingLevel level) { return 0; }
+  static inline size_t malloc_header_size(void* memblock) { return 0; }
+  static inline void* malloc_base(void* memblock) { return memblock; }
+  static inline void* record_free(void* memblock) { return memblock; }
+
+  static inline void record_new_arena(MEMFLAGS flag) { }
+  static inline void record_arena_free(MEMFLAGS flag) { }
+  static inline void record_arena_size_change(int diff, MEMFLAGS flag) { }
+  static inline void record_virtual_memory_reserve(void* addr, size_t size, const NativeCallStack& stack,
+                       MEMFLAGS flag = mtNone) { }
+  static inline void record_virtual_memory_reserve_and_commit(void* addr, size_t size,
+    const NativeCallStack& stack, MEMFLAGS flag = mtNone) { }
+  static inline void record_virtual_memory_commit(void* addr, size_t size, const NativeCallStack& stack) { }
+  static inline Tracker get_virtual_memory_uncommit_tracker() { return Tracker(); }
+  static inline Tracker get_virtual_memory_release_tracker() { }
+  static inline void record_virtual_memory_type(void* addr, MEMFLAGS flag) { }
+  static inline void record_thread_stack(void* addr, size_t size) { }
+  static inline void release_thread_stack(void* addr, size_t size) { }
+
+  static void final_report(outputStream*) { }
+};
+
+#else
+
+#include "runtime/atomic.hpp"
+#include "runtime/threadCritical.hpp"
+#include "services/mallocTracker.hpp"
+#include "services/virtualMemoryTracker.hpp"
+
+extern volatile bool NMT_stack_walkable;
+
+#define CURRENT_PC ((MemTracker::tracking_level() == NMT_detail && NMT_stack_walkable) ? \
+                    NativeCallStack(0, true) : emptyStack)
+#define CALLER_PC  ((MemTracker::tracking_level() == NMT_detail && NMT_stack_walkable) ?  \
+                    NativeCallStack(1, true) : emptyStack)
+
+class MemBaseline;
+class Mutex;
+
+// Tracker is used for guarding 'release' semantics of virtual memory operation, to avoid
+// the other thread obtains and records the same region that is just 'released' by current
+// thread but before it can record the operation.
+class Tracker : public StackObj {
+ public:
+  enum TrackerType {
+     uncommit,
+     release
+  };
+
+ public:
+  Tracker(enum TrackerType type) : _type(type) { }
+  void record(address addr, size_t size);
+ private:
+  enum TrackerType  _type;
+  // Virtual memory tracking data structures are protected by ThreadCritical lock.
+  ThreadCritical    _tc;
 };
 
 class MemTracker : AllStatic {
-  public:
-   enum ShutdownReason {
-      NMT_shutdown_none,     // no shutdown requested
-      NMT_shutdown_user,     // user requested shutdown
-      NMT_normal,            // normal shutdown, process exit
-      NMT_out_of_memory,     // shutdown due to out of memory
-      NMT_initialization,    // shutdown due to initialization failure
-      NMT_use_malloc_only,   // can not combine NMT with UseMallocOnly flag
-      NMT_error_reporting,   // shutdown by vmError::report_and_die()
-      NMT_out_of_generation, // running out of generation queue
-      NMT_sequence_overflow  // overflow the sequence number
-   };
-
-  class Tracker {
-   public:
-    void discard() { }
-
-    void record(address addr, size_t size = 0, MEMFLAGS flags = mtNone, address pc = NULL) { }
-    void record(address old_addr, address new_addr, size_t size,
-      MEMFLAGS flags, address pc = NULL) { }
-  };
-
-  private:
-   static Tracker  _tkr;
-
-
-  public:
-   static inline void init_tracking_options(const char* option_line) { }
-   static inline bool is_on()   { return false; }
-   static const char* reason()  { return "Native memory tracking is not implemented"; }
-   static inline bool can_walk_stack() { return false; }
-
-   static inline void bootstrap_single_thread() { }
-   static inline void bootstrap_multi_thread() { }
-   static inline void start() { }
-
-   static inline void record_malloc(address addr, size_t size, MEMFLAGS flags,
-        address pc = 0, Thread* thread = NULL) { }
-   static inline void record_free(address addr, MEMFLAGS flags, Thread* thread = NULL) { }
-   static inline void record_arena_size(address addr, size_t size) { }
-   static inline void record_virtual_memory_reserve(address addr, size_t size,
-        MEMFLAGS flags, address pc = 0, Thread* thread = NULL) { }
-   static inline void record_virtual_memory_reserve_and_commit(address addr, size_t size,
-        MEMFLAGS flags, address pc = 0, Thread* thread = NULL) { }
-   static inline void record_virtual_memory_commit(address addr, size_t size,
-        address pc = 0, Thread* thread = NULL) { }
-   static inline void record_virtual_memory_release(address addr, size_t size,
-        Thread* thread = NULL) { }
-   static inline void record_virtual_memory_type(address base, MEMFLAGS flags,
-        Thread* thread = NULL) { }
-   static inline Tracker get_realloc_tracker() { return _tkr; }
-   static inline Tracker get_virtual_memory_uncommit_tracker() { return _tkr; }
-   static inline Tracker get_virtual_memory_release_tracker()  { return _tkr; }
-   static inline bool baseline() { return false; }
-   static inline bool has_baseline() { return false; }
-
-   static inline void set_autoShutdown(bool value) { }
-   static void shutdown(ShutdownReason reason) { }
-   static inline bool shutdown_in_progress() { return false; }
-   static bool print_memory_usage(BaselineOutputer& out, size_t unit,
-            bool summary_only = true) { return false; }
-   static bool compare_memory_usage(BaselineOutputer& out, size_t unit,
-            bool summary_only = true) { return false; }
-
-   static bool wbtest_wait_for_data_merge() { return false; }
-
-   static inline void sync() { }
-   static inline void thread_exiting(JavaThread* thread) { }
-};
-
-
-#else // !INCLUDE_NMT
-
-#include "memory/allocation.hpp"
-#include "runtime/globals.hpp"
-#include "runtime/mutex.hpp"
-#include "runtime/os.hpp"
-#include "runtime/thread.hpp"
-#include "services/memPtr.hpp"
-#include "services/memRecorder.hpp"
-#include "services/memSnapshot.hpp"
-#include "services/memTrackWorker.hpp"
-
-extern bool NMT_track_callsite;
-
-#ifndef MAX_UNSIGNED_LONG
-#define MAX_UNSIGNED_LONG    (unsigned long)(-1)
-#endif
-
-#ifdef ASSERT
-  #define DEBUG_CALLER_PC  (NMT_track_callsite ? os::get_caller_pc(2) : 0)
-#else
-  #define DEBUG_CALLER_PC  0
-#endif
-
-// The thread closure walks threads to collect per-thread
-// memory recorders at NMT sync point
-class SyncThreadRecorderClosure : public ThreadClosure {
- private:
-  int _thread_count;
-
  public:
-  SyncThreadRecorderClosure() {
-    _thread_count =0;
-  }
-
-  void do_thread(Thread* thread);
-  int  get_thread_count() const {
-    return _thread_count;
-  }
-};
-
-class BaselineOutputer;
-class MemSnapshot;
-class MemTrackWorker;
-class Thread;
-/*
- * MemTracker is the 'gate' class to native memory tracking runtime.
- */
-class MemTracker : AllStatic {
-  friend class GenerationData;
-  friend class MemTrackWorker;
-  friend class MemSnapshot;
-  friend class SyncThreadRecorderClosure;
-
-  // NMT state
-  enum NMTStates {
-    NMT_uninited,                        // not yet initialized
-    NMT_bootstrapping_single_thread,     // bootstrapping, VM is in single thread mode
-    NMT_bootstrapping_multi_thread,      // bootstrapping, VM is about to enter multi-thread mode
-    NMT_started,                         // NMT fully started
-    NMT_shutdown_pending,                // shutdown pending
-    NMT_final_shutdown,                  // in final phase of shutdown
-    NMT_shutdown                         // shutdown
-  };
-
- public:
-  class Tracker : public StackObj {
-    friend class MemTracker;
-   public:
-    enum MemoryOperation {
-      NoOp,                   // no op
-      Malloc,                 // malloc
-      Realloc,                // realloc
-      Free,                   // free
-      Reserve,                // virtual memory reserve
-      Commit,                 // virtual memory commit
-      ReserveAndCommit,       // virtual memory reserve and commit
-      StackAlloc = ReserveAndCommit, // allocate thread stack
-      Type,                   // assign virtual memory type
-      Uncommit,               // virtual memory uncommit
-      Release,                // virtual memory release
-      ArenaSize,              // set arena size
-      StackRelease            // release thread stack
-    };
-
-
-   protected:
-    Tracker(MemoryOperation op, Thread* thr = NULL);
-
-   public:
-    void discard();
-
-    void record(address addr, size_t size = 0, MEMFLAGS flags = mtNone, address pc = NULL);
-    void record(address old_addr, address new_addr, size_t size,
-      MEMFLAGS flags, address pc = NULL);
-
-   private:
-    bool            _need_thread_critical_lock;
-    JavaThread*     _java_thread;
-    MemoryOperation _op;          // memory operation
-    jint            _seq;         // reserved sequence number
-  };
-
-
- public:
-  // native memory tracking level
-  enum NMTLevel {
-    NMT_off,              // native memory tracking is off
-    NMT_summary,          // don't track callsite
-    NMT_detail            // track callsite also
-  };
-
-   enum ShutdownReason {
-     NMT_shutdown_none,     // no shutdown requested
-     NMT_shutdown_user,     // user requested shutdown
-     NMT_normal,            // normal shutdown, process exit
-     NMT_out_of_memory,     // shutdown due to out of memory
-     NMT_initialization,    // shutdown due to initialization failure
-     NMT_use_malloc_only,   // can not combine NMT with UseMallocOnly flag
-     NMT_error_reporting,   // shutdown by vmError::report_and_die()
-     NMT_out_of_generation, // running out of generation queue
-     NMT_sequence_overflow  // overflow the sequence number
-   };
-
- public:
-  // initialize NMT tracking level from command line options, called
-   // from VM command line parsing code
-  static void init_tracking_options(const char* option_line);
-
-  // if NMT is enabled to record memory activities
-  static inline bool is_on() {
-    return (_tracking_level >= NMT_summary &&
-      _state >= NMT_bootstrapping_single_thread);
-  }
-
-  static inline enum NMTLevel tracking_level() {
+  static inline NMT_TrackingLevel tracking_level() {
+    if (_tracking_level == NMT_unknown) {
+      // No fencing is needed here, since JVM is in single-threaded
+      // mode.
+      _tracking_level = init_tracking_level();
+      _cmdline_tracking_level = _tracking_level;
+    }
     return _tracking_level;
   }
 
-  // user readable reason for shutting down NMT
-  static const char* reason() {
-    switch(_reason) {
-      case NMT_shutdown_none:
-        return "Native memory tracking is not enabled";
-      case NMT_shutdown_user:
-        return "Native memory tracking has been shutdown by user";
-      case NMT_normal:
-        return "Native memory tracking has been shutdown due to process exiting";
-      case NMT_out_of_memory:
-        return "Native memory tracking has been shutdown due to out of native memory";
-      case NMT_initialization:
-        return "Native memory tracking failed to initialize";
-      case NMT_error_reporting:
-        return "Native memory tracking has been shutdown due to error reporting";
-      case NMT_out_of_generation:
-        return "Native memory tracking has been shutdown due to running out of generation buffer";
-      case NMT_sequence_overflow:
-        return "Native memory tracking has been shutdown due to overflow the sequence number";
-      case NMT_use_malloc_only:
-        return "Native memory tracking is not supported when UseMallocOnly is on";
-      default:
-        ShouldNotReachHere();
-        return NULL;
-    }
+  // A late initialization, for the stuff(s) can not be
+  // done in init_tracking_level(), which can NOT malloc
+  // any memory.
+  static void init();
+
+  // Shutdown native memory tracking
+  static void shutdown();
+
+  // Verify native memory tracking command line option.
+  // This check allows JVM to detect if compatible launcher
+  // is used.
+  // If an incompatible launcher is used, NMT may not be
+  // able to start, even it is enabled by command line option.
+  // A warning message should be given if it is encountered.
+  static bool check_launcher_nmt_support(const char* value);
+
+  // This method checks native memory tracking environment
+  // variable value passed by launcher.
+  // Launcher only obligates to pass native memory tracking
+  // option value, but not obligates to validate the value,
+  // and launcher has option to discard native memory tracking
+  // option from the command line once it sets up the environment
+  // variable, so NMT has to catch the bad value here.
+  static bool verify_nmt_option();
+
+  // Transition the tracking level to specified level
+  static bool transition_to(NMT_TrackingLevel level);
+
+  static inline void* record_malloc(void* mem_base, size_t size, MEMFLAGS flag,
+    const NativeCallStack& stack, NMT_TrackingLevel level) {
+    return MallocTracker::record_malloc(mem_base, size, flag, stack, level);
+  }
+
+  static inline size_t malloc_header_size(NMT_TrackingLevel level) {
+    return MallocTracker::malloc_header_size(level);
   }
 
-  // test if we can walk native stack
-  static bool can_walk_stack() {
-  // native stack is not walkable during bootstrapping on sparc
-#if defined(SPARC)
-    return (_state == NMT_started);
-#else
-    return (_state >= NMT_bootstrapping_single_thread && _state  <= NMT_started);
-#endif
+  static size_t malloc_header_size(void* memblock) {
+    if (tracking_level() != NMT_off) {
+      return MallocTracker::get_header_size(memblock);
+    }
+    return 0;
+  }
+
+  // To malloc base address, which is the starting address
+  // of malloc tracking header if tracking is enabled.
+  // Otherwise, it returns the same address.
+  static void* malloc_base(void* memblock);
+
+  // Record malloc free and return malloc base address
+  static inline void* record_free(void* memblock) {
+    return MallocTracker::record_free(memblock);
   }
 
-  // if native memory tracking tracks callsite
-  static inline bool track_callsite() { return _tracking_level == NMT_detail; }
+
+  // Record creation of an arena
+  static inline void record_new_arena(MEMFLAGS flag) {
+    if (tracking_level() < NMT_summary) return;
+    MallocTracker::record_new_arena(flag);
+  }
+
+  // Record destruction of an arena
+  static inline void record_arena_free(MEMFLAGS flag) {
+    if (tracking_level() < NMT_summary) return;
+    MallocTracker::record_arena_free(flag);
+  }
 
-  // NMT automatically shuts itself down under extreme situation by default.
-  // When the value is set to false,  NMT will try its best to stay alive,
-  // even it has to slow down VM.
-  static inline void set_autoShutdown(bool value) {
-    AutoShutdownNMT = value;
-    if (AutoShutdownNMT && _slowdown_calling_thread) {
-      _slowdown_calling_thread = false;
+  // Record arena size change. Arena size is the size of all arena
+  // chuncks that backing up the arena.
+  static inline void record_arena_size_change(int diff, MEMFLAGS flag) {
+    if (tracking_level() < NMT_summary) return;
+    MallocTracker::record_arena_size_change(diff, flag);
+  }
+
+  static inline void record_virtual_memory_reserve(void* addr, size_t size, const NativeCallStack& stack,
+    MEMFLAGS flag = mtNone) {
+    if (tracking_level() < NMT_summary) return;
+    if (addr != NULL) {
+      ThreadCritical tc;
+      // Recheck to avoid potential racing during NMT shutdown
+      if (tracking_level() < NMT_summary) return;
+      VirtualMemoryTracker::add_reserved_region((address)addr, size, stack, flag);
     }
   }
 
-  // shutdown native memory tracking capability. Native memory tracking
-  // can be shutdown by VM when it encounters low memory scenarios.
-  // Memory tracker should gracefully shutdown itself, and preserve the
-  // latest memory statistics for post morten diagnosis.
-  static void shutdown(ShutdownReason reason);
-
-  // if there is shutdown requested
-  static inline bool shutdown_in_progress() {
-    return (_state >= NMT_shutdown_pending);
-  }
-
-  // bootstrap native memory tracking, so it can start to collect raw data
-  // before worker thread can start
-
-  // the first phase of bootstrapping, when VM still in single-threaded mode
-  static void bootstrap_single_thread();
-  // the second phase of bootstrapping, VM is about or already in multi-threaded mode
-  static void bootstrap_multi_thread();
-
-
-  // start() has to be called when VM still in single thread mode, but after
-  // command line option parsing is done.
-  static void start();
-
-  // record a 'malloc' call
-  static inline void record_malloc(address addr, size_t size, MEMFLAGS flags,
-                            address pc = 0, Thread* thread = NULL) {
-    Tracker tkr(Tracker::Malloc, thread);
-    tkr.record(addr, size, flags, pc);
-  }
-  // record a 'free' call
-  static inline void record_free(address addr, MEMFLAGS flags, Thread* thread = NULL) {
-    Tracker tkr(Tracker::Free, thread);
-    tkr.record(addr, 0, flags, DEBUG_CALLER_PC);
-  }
-
-  static inline void record_arena_size(address addr, size_t size) {
-    Tracker tkr(Tracker::ArenaSize);
-    tkr.record(addr, size);
-  }
-
-  // record a virtual memory 'reserve' call
-  static inline void record_virtual_memory_reserve(address addr, size_t size,
-                     MEMFLAGS flags, address pc = 0, Thread* thread = NULL) {
-    assert(size > 0, "Sanity check");
-    Tracker tkr(Tracker::Reserve, thread);
-    tkr.record(addr, size, flags, pc);
-  }
-
-  static inline void record_thread_stack(address addr, size_t size, Thread* thr,
-                           address pc = 0) {
-    Tracker tkr(Tracker::StackAlloc, thr);
-    tkr.record(addr, size, mtThreadStack, pc);
-  }
-
-  static inline void release_thread_stack(address addr, size_t size, Thread* thr) {
-    Tracker tkr(Tracker::StackRelease, thr);
-    tkr.record(addr, size, mtThreadStack, DEBUG_CALLER_PC);
-  }
-
-  // record a virtual memory 'commit' call
-  static inline void record_virtual_memory_commit(address addr, size_t size,
-                            address pc, Thread* thread = NULL) {
-    Tracker tkr(Tracker::Commit, thread);
-    tkr.record(addr, size, mtNone, pc);
-  }
-
-  static inline void record_virtual_memory_reserve_and_commit(address addr, size_t size,
-    MEMFLAGS flags, address pc, Thread* thread = NULL) {
-    Tracker tkr(Tracker::ReserveAndCommit, thread);
-    tkr.record(addr, size, flags, pc);
-  }
-
-  static inline void record_virtual_memory_release(address addr, size_t size,
-      Thread* thread = NULL) {
-    if (is_on()) {
-      Tracker tkr(Tracker::Release, thread);
-      tkr.record(addr, size);
+  static inline void record_virtual_memory_reserve_and_commit(void* addr, size_t size,
+    const NativeCallStack& stack, MEMFLAGS flag = mtNone) {
+    if (tracking_level() < NMT_summary) return;
+    if (addr != NULL) {
+      ThreadCritical tc;
+      if (tracking_level() < NMT_summary) return;
+      VirtualMemoryTracker::add_reserved_region((address)addr, size,
+        stack, flag, true);
     }
   }
 
-  // record memory type on virtual memory base address
-  static inline void record_virtual_memory_type(address base, MEMFLAGS flags,
-                            Thread* thread = NULL) {
-    Tracker tkr(Tracker::Type);
-    tkr.record(base, 0, flags);
-  }
-
-  // Get memory trackers for memory operations that can result race conditions.
-  // The memory tracker has to be obtained before realloc, virtual memory uncommit
-  // and virtual memory release, and call tracker.record() method if operation
-  // succeeded, or tracker.discard() to abort the tracking.
-  static inline Tracker get_realloc_tracker() {
-    return Tracker(Tracker::Realloc);
+  static inline void record_virtual_memory_commit(void* addr, size_t size,
+    const NativeCallStack& stack) {
+    if (tracking_level() < NMT_summary) return;
+    if (addr != NULL) {
+      ThreadCritical tc;
+      if (tracking_level() < NMT_summary) return;
+      VirtualMemoryTracker::add_committed_region((address)addr, size, stack);
+    }
   }
 
   static inline Tracker get_virtual_memory_uncommit_tracker() {
-    return Tracker(Tracker::Uncommit);
+    assert(tracking_level() >= NMT_summary, "Check by caller");
+    return Tracker(Tracker::uncommit);
   }
 
   static inline Tracker get_virtual_memory_release_tracker() {
-    return Tracker(Tracker::Release);
-  }
-
-
-  // create memory baseline of current memory snapshot
-  static bool baseline();
-  // is there a memory baseline
-  static bool has_baseline() {
-    return _baseline.baselined();
+    assert(tracking_level() >= NMT_summary, "Check by caller");
+    return Tracker(Tracker::release);
   }
 
-  // print memory usage from current snapshot
-  static bool print_memory_usage(BaselineOutputer& out, size_t unit,
-           bool summary_only = true);
-  // compare memory usage between current snapshot and baseline
-  static bool compare_memory_usage(BaselineOutputer& out, size_t unit,
-           bool summary_only = true);
-
-  // the version for whitebox testing support, it ensures that all memory
-  // activities before this method call, are reflected in the snapshot
-  // database.
-  static bool wbtest_wait_for_data_merge();
-
-  // sync is called within global safepoint to synchronize nmt data
-  static void sync();
-
-  // called when a thread is about to exit
-  static void thread_exiting(JavaThread* thread);
-
-  // retrieve global snapshot
-  static MemSnapshot* get_snapshot() {
-    if (shutdown_in_progress()) {
-      return NULL;
+  static inline void record_virtual_memory_type(void* addr, MEMFLAGS flag) {
+    if (tracking_level() < NMT_summary) return;
+    if (addr != NULL) {
+      ThreadCritical tc;
+      if (tracking_level() < NMT_summary) return;
+      VirtualMemoryTracker::set_reserved_region_type((address)addr, flag);
     }
-    return _snapshot;
   }
 
-  // print tracker stats
-  NOT_PRODUCT(static void print_tracker_stats(outputStream* st);)
-  NOT_PRODUCT(static void walk_stack(int toSkip, char* buf, int len);)
-
- private:
-  // start native memory tracking worker thread
-  static bool start_worker(MemSnapshot* snapshot);
-
-  // called by worker thread to complete shutdown process
-  static void final_shutdown();
-
- protected:
-  // retrieve per-thread recorder of the specified thread.
-  // if the recorder is full, it will be enqueued to overflow
-  // queue, a new recorder is acquired from recorder pool or a
-  // new instance is created.
-  // when thread == NULL, it means global recorder
-  static MemRecorder* get_thread_recorder(JavaThread* thread);
-
-  // per-thread recorder pool
-  static void release_thread_recorder(MemRecorder* rec);
-  static void delete_all_pooled_recorders();
-
-  // pending recorder queue. Recorders are queued to pending queue
-  // when they are overflowed or collected at nmt sync point.
-  static void enqueue_pending_recorder(MemRecorder* rec);
-  static MemRecorder* get_pending_recorders();
-  static void delete_all_pending_recorders();
-
-  // write a memory tracking record in recorder
-  static void write_tracking_record(address addr, MEMFLAGS type,
-    size_t size, jint seq, address pc, JavaThread* thread);
-
-  static bool is_single_threaded_bootstrap() {
-    return _state == NMT_bootstrapping_single_thread;
+  static inline void record_thread_stack(void* addr, size_t size) {
+    if (tracking_level() < NMT_summary) return;
+    if (addr != NULL) {
+      // uses thread stack malloc slot for book keeping number of threads
+      MallocMemorySummary::record_malloc(0, mtThreadStack);
+      record_virtual_memory_reserve_and_commit(addr, size, CALLER_PC, mtThreadStack);
+    }
   }
 
-  static void check_NMT_load(Thread* thr) {
-    assert(thr != NULL, "Sanity check");
-    if (_slowdown_calling_thread && thr != _worker_thread) {
-#ifdef _WINDOWS
-      // On Windows, os::NakedYield() does not work as well
-      // as os::yield_all()
-      os::yield_all();
-#else
-     // On Solaris, os::yield_all() depends on os::sleep()
-     // which requires JavaTherad in _thread_in_vm state.
-     // Transits thread to _thread_in_vm state can be dangerous
-     // if caller holds lock, as it may deadlock with Threads_lock.
-     // So use NaKedYield instead.
-     //
-     // Linux and BSD, NakedYield() and yield_all() implementations
-     // are the same.
-      os::NakedYield();
-#endif
+  static inline void release_thread_stack(void* addr, size_t size) {
+    if (tracking_level() < NMT_summary) return;
+    if (addr != NULL) {
+      // uses thread stack malloc slot for book keeping number of threads
+      MallocMemorySummary::record_free(0, mtThreadStack);
+      ThreadCritical tc;
+      if (tracking_level() < NMT_summary) return;
+      VirtualMemoryTracker::remove_released_region((address)addr, size);
     }
   }
 
-  static void inc_pending_op_count() {
-    Atomic::inc(&_pending_op_count);
-  }
+  // Query lock is used to synchronize the access to tracking data.
+  // So far, it is only used by JCmd query, but it may be used by
+  // other tools.
+  static inline Mutex* query_lock() { return _query_lock; }
 
-  static void dec_pending_op_count() {
-    Atomic::dec(&_pending_op_count);
-    assert(_pending_op_count >= 0, "Sanity check");
+  // Make a final report and shutdown.
+  // This function generates summary report without creating snapshots,
+  // to avoid additional memory allocation. It uses native memory summary
+  // counters, and makes adjustment to them, once the adjustment is made,
+  // the counters are no longer accurate. As the result, this function
+  // should only be used for final reporting before shutting down.
+  static void final_report(outputStream*);
+
+  // Stored baseline
+  static inline MemBaseline& get_baseline() {
+    return _baseline;
   }
 
-
- private:
-  // retrieve a pooled memory record or create new one if there is not
-  // one available
-  static MemRecorder* get_new_or_pooled_instance();
-  static void create_memory_record(address addr, MEMFLAGS type,
-                   size_t size, address pc, Thread* thread);
-  static void create_record_in_recorder(address addr, MEMFLAGS type,
-                   size_t size, address pc, JavaThread* thread);
-
-  static void set_current_processing_generation(unsigned long generation) {
-    _worker_thread_idle = false;
-    _processing_generation = generation;
+  static NMT_TrackingLevel cmdline_tracking_level() {
+    return _cmdline_tracking_level;
   }
 
-  static void report_worker_idle() {
-    _worker_thread_idle = true;
-  }
+  static void tuning_statistics(outputStream* out);
 
  private:
-  // global memory snapshot
-  static MemSnapshot*     _snapshot;
-
-  // a memory baseline of snapshot
-  static MemBaseline      _baseline;
-
-  // query lock
-  static Mutex*           _query_lock;
-
-  // a thread can start to allocate memory before it is attached
-  // to VM 'Thread', those memory activities are recorded here.
-  // ThreadCritical is required to guard this global recorder.
-  static MemRecorder* volatile _global_recorder;
-
-  // main thread id
-  debug_only(static intx   _main_thread_tid;)
-
-  // pending recorders to be merged
-  static MemRecorder* volatile     _merge_pending_queue;
-
-  NOT_PRODUCT(static volatile jint   _pending_recorder_count;)
-
-  // pooled memory recorders
-  static MemRecorder* volatile     _pooled_recorders;
-
-  // memory recorder pool management, uses following
-  // counter to determine if a released memory recorder
-  // should be pooled
+  static NMT_TrackingLevel init_tracking_level();
 
-  // latest thread count
-  static int               _thread_count;
-  // pooled recorder count
-  static volatile jint     _pooled_recorder_count;
-
-
-  // worker thread to merge pending recorders into snapshot
-  static MemTrackWorker*  _worker_thread;
-
-  // how many safepoints we skipped without entering sync point
-  static int              _sync_point_skip_count;
-
-  // if the tracker is properly intialized
-  static bool             _is_tracker_ready;
-  // tracking level (off, summary and detail)
-  static enum NMTLevel    _tracking_level;
-
-  // current nmt state
-  static volatile enum NMTStates   _state;
-  // the reason for shutting down nmt
-  static enum ShutdownReason       _reason;
-  // the generation that NMT is processing
-  static volatile unsigned long    _processing_generation;
-  // although NMT is still procesing current generation, but
-  // there is not more recorder to process, set idle state
-  static volatile bool             _worker_thread_idle;
-
-  // if NMT should slow down calling thread to allow
-  // worker thread to catch up
-  static volatile bool             _slowdown_calling_thread;
-
-  // pending memory op count.
-  // Certain memory ops need to pre-reserve sequence number
-  // before memory operation can happen to avoid race condition.
-  // See MemTracker::Tracker for detail
-  static volatile jint             _pending_op_count;
+ private:
+  // Tracking level
+  static volatile NMT_TrackingLevel   _tracking_level;
+  // If NMT option value passed by launcher through environment
+  // variable is valid
+  static bool                         _is_nmt_env_valid;
+  // command line tracking level
+  static NMT_TrackingLevel            _cmdline_tracking_level;
+  // Stored baseline
+  static MemBaseline      _baseline;
+  // Query lock
+  static Mutex*           _query_lock;
 };
 
-#endif // !INCLUDE_NMT
+#endif // INCLUDE_NMT
 
 #endif // SHARE_VM_SERVICES_MEM_TRACKER_HPP
+