Merge

build/windows/makefiles/compile.make

@@ -44,6 +44,10 @@ CPP=cl.exe
 #   /Od       Disable all optimizations
 #
 # NOTE: Normally following any of the above with a '-' will turn off that flag
+#
+# 6655385: For VS2003/2005 we now specify /Oy- (disable frame pointer
+# omission.)  This has little to no effect on performance while vastly
+# improving the quality of crash log stack traces involving jvm.dll.
 
 # These are always used in all compiles
 CPP_FLAGS=/nologo /W3 /WX
@@ -141,14 +145,14 @@ DEBUG_OPT_OPTION     = /Od
 !endif
 
 !if "$(COMPILER_NAME)" == "VS2003"
-PRODUCT_OPT_OPTION   = /O2
-FASTDEBUG_OPT_OPTION = /O2
+PRODUCT_OPT_OPTION   = /O2 /Oy-
+FASTDEBUG_OPT_OPTION = /O2 /Oy-
 DEBUG_OPT_OPTION     = /Od
 !endif
 
 !if "$(COMPILER_NAME)" == "VS2005"
-PRODUCT_OPT_OPTION   = /O2
-FASTDEBUG_OPT_OPTION = /O2
+PRODUCT_OPT_OPTION   = /O2 /Oy-
+FASTDEBUG_OPT_OPTION = /O2 /Oy-
 DEBUG_OPT_OPTION     = /Od
 GX_OPTION = /EHsc
 # This VS2005 compiler has /GS as a default and requires bufferoverflowU.lib 
@@ -165,8 +169,8 @@ CPP_FLAGS=$(CPP_FLAGS) /D _CRT_SECURE_NO_DEPRECATE
 
 # Compile for space above time.
 !if "$(Variant)" == "kernel"
-PRODUCT_OPT_OPTION   = /O1
-FASTDEBUG_OPT_OPTION = /O1
+PRODUCT_OPT_OPTION   = /O1 /Oy-
+FASTDEBUG_OPT_OPTION = /O1 /Oy-
 DEBUG_OPT_OPTION     = /Od
 !endif
 

src/os/linux/vm/os_linux.cpp

@@ -1261,19 +1261,13 @@ jlong os::elapsed_frequency() {
   return (1000 * 1000);
 }
 
-jlong os::timeofday() {
+jlong os::javaTimeMillis() {
   timeval time;
   int status = gettimeofday(&time, NULL);
   assert(status != -1, "linux error");
   return jlong(time.tv_sec) * 1000  +  jlong(time.tv_usec / 1000);
 }
 
-// Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis
-// _use_global_time is only set if CacheTimeMillis is true
-jlong os::javaTimeMillis() {
-  return (_use_global_time ? read_global_time() : timeofday());
-}
-
 #ifndef CLOCK_MONOTONIC
 #define CLOCK_MONOTONIC (1)
 #endif

src/os/solaris/vm/os_solaris.cpp

@@ -1691,19 +1691,14 @@ jlong getTimeMillis() {
   return (jlong)(nanotime / NANOSECS_PER_MILLISECS);
 }
 
-jlong os::timeofday() {
+// Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis
+jlong os::javaTimeMillis() {
   timeval t;
   if (gettimeofday( &t, NULL) == -1)
-    fatal1("timeofday: gettimeofday (%s)", strerror(errno));
+    fatal1("os::javaTimeMillis: gettimeofday (%s)", strerror(errno));
   return jlong(t.tv_sec) * 1000  +  jlong(t.tv_usec) / 1000;
 }
 
-// Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis
-// _use_global_time is only set if CacheTimeMillis is true
-jlong os::javaTimeMillis() {
-  return (_use_global_time ? read_global_time() : timeofday());
-}
-
 jlong os::javaTimeNanos() {
   return (jlong)getTimeNanos();
 }
@@ -2785,16 +2780,15 @@ char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) {
   return b;
 }
 
-char*
-os::reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
-  char* addr = NULL;
-  int   flags;
+char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes, size_t alignment_hint, bool fixed) {
+  char* addr = requested_addr;
+  int flags = MAP_PRIVATE | MAP_NORESERVE;
+
+  assert(!(fixed && (alignment_hint > 0)), "alignment hint meaningless with fixed mmap");
 
-  flags = MAP_PRIVATE | MAP_NORESERVE;
-  if (requested_addr != NULL) {
-      flags |= MAP_FIXED;
-      addr = requested_addr;
-  } else if (has_map_align && alignment_hint > (size_t) vm_page_size()) {
+  if (fixed) {
+    flags |= MAP_FIXED;
+  } else if (has_map_align && (alignment_hint > (size_t) vm_page_size())) {
     flags |= MAP_ALIGN;
     addr = (char*) alignment_hint;
   }
@@ -2802,11 +2796,14 @@ os::reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
   // Map uncommitted pages PROT_NONE so we fail early if we touch an
   // uncommitted page. Otherwise, the read/write might succeed if we
   // have enough swap space to back the physical page.
-  addr = Solaris::mmap_chunk(addr, bytes, flags, PROT_NONE);
+  return mmap_chunk(addr, bytes, flags, PROT_NONE);
+}
+
+char* os::reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
+  char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint, (requested_addr != NULL));
 
   guarantee(requested_addr == NULL || requested_addr == addr,
             "OS failed to return requested mmap address.");
-
   return addr;
 }
 
@@ -2832,6 +2829,31 @@ char* os::attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
   // in one of the methods further up the call chain.  See bug 5044738.
   assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
 
+  // Since snv_84, Solaris attempts to honor the address hint - see 5003415.
+  // Give it a try, if the kernel honors the hint we can return immediately.
+  char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false);
+  volatile int err = errno;
+  if (addr == requested_addr) {
+    return addr;
+  } else if (addr != NULL) {
+    unmap_memory(addr, bytes);
+  }
+
+  if (PrintMiscellaneous && Verbose) {
+    char buf[256];
+    buf[0] = '\0';
+    if (addr == NULL) {
+      jio_snprintf(buf, sizeof(buf), ": %s", strerror(err));
+    }
+    warning("attempt_reserve_memory_at: couldn't reserve %d bytes at "
+            PTR_FORMAT ": reserve_memory_helper returned " PTR_FORMAT
+            "%s", bytes, requested_addr, addr, buf);
+  }
+
+  // Address hint method didn't work.  Fall back to the old method.
+  // In theory, once SNV becomes our oldest supported platform, this
+  // code will no longer be needed.
+  //
   // Repeatedly allocate blocks until the block is allocated at the
   // right spot. Give up after max_tries.
   int i;

src/os/solaris/vm/os_solaris.hpp

@@ -156,6 +156,7 @@ class Solaris {
   static int get_dev_zero_fd() { return _dev_zero_fd; }
   static void set_dev_zero_fd(int fd) { _dev_zero_fd = fd; }
   static char* mmap_chunk(char *addr, size_t size, int flags, int prot);
+  static char* anon_mmap(char* requested_addr, size_t bytes, size_t alignment_hint, bool fixed);
   static bool mpss_sanity_check(bool warn, size_t * page_size);
   static bool ism_sanity_check (bool warn, size_t * page_size);
 

src/os/windows/vm/os_windows.cpp

@@ -737,20 +737,13 @@ FILETIME java_to_windows_time(jlong l) {
   return result;
 }
 
-jlong os::timeofday() {
-  FILETIME wt;
-  GetSystemTimeAsFileTime(&wt);
-  return windows_to_java_time(wt);
-}
-
-
-// Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis
-// _use_global_time is only set if CacheTimeMillis is true
 jlong os::javaTimeMillis() {
   if (UseFakeTimers) {
     return fake_time++;
   } else {
-    return (_use_global_time ? read_global_time() : timeofday());
+    FILETIME wt;
+    GetSystemTimeAsFileTime(&wt);
+    return windows_to_java_time(wt);
   }
 }
 

src/share/vm/code/dependencies.cpp

@@ -1499,9 +1499,12 @@ bool DepChange::ContextStream::next() {
     // fall through:
     _change_type = Change_new_sub;
   case Change_new_sub:
-    _klass = instanceKlass::cast(_klass)->super();
-    if (_klass != NULL) {
-      return true;
+    // 6598190: brackets workaround Sun Studio C++ compiler bug 6629277
+    {
+      _klass = instanceKlass::cast(_klass)->super();
+      if (_klass != NULL) {
+        return true;
+      }
     }
     // else set up _ti_limit and fall through:
     _ti_limit = (_ti_base == NULL) ? 0 : _ti_base->length();

src/share/vm/runtime/arguments.cpp

@@ -1279,12 +1279,10 @@ void Arguments::set_aggressive_opts_flags() {
 #endif
 
   if (AggressiveOpts) {
-NOT_WINDOWS(
-    // No measured benefit on Windows
-    if (FLAG_IS_DEFAULT(CacheTimeMillis)) {
-      FLAG_SET_DEFAULT(CacheTimeMillis, true);
-    }
-)
+// Sample flag setting code
+//    if (FLAG_IS_DEFAULT(EliminateZeroing)) {
+//      FLAG_SET_DEFAULT(EliminateZeroing, true);
+//    }
   }
 }
 

src/share/vm/runtime/biasedLocking.cpp

@@ -38,8 +38,11 @@ static void enable_biased_locking(klassOop k) {
 
 class VM_EnableBiasedLocking: public VM_Operation {
  public:
-  VM_EnableBiasedLocking() {}
-  VMOp_Type type() const   { return VMOp_EnableBiasedLocking; }
+  VM_EnableBiasedLocking()        {}
+  VMOp_Type type() const          { return VMOp_EnableBiasedLocking; }
+  Mode evaluation_mode() const    { return _async_safepoint; }
+  bool is_cheap_allocated() const { return true; }
+
   void doit() {
     // Iterate the system dictionary enabling biased locking for all
     // currently loaded classes
@@ -62,8 +65,10 @@ class EnableBiasedLockingTask : public PeriodicTask {
   EnableBiasedLockingTask(size_t interval_time) : PeriodicTask(interval_time) {}
 
   virtual void task() {
-    VM_EnableBiasedLocking op;
-    VMThread::execute(&op);
+    // Use async VM operation to avoid blocking the Watcher thread.
+    // VM Thread will free C heap storage.
+    VM_EnableBiasedLocking *op = new VM_EnableBiasedLocking();
+    VMThread::execute(op);
 
     // Reclaim our storage and disenroll ourself
     delete this;

src/share/vm/runtime/globals.hpp

@@ -344,12 +344,6 @@ class CommandLineFlags {
   product(bool, ForceTimeHighResolution, false,                             \
           "Using high time resolution(For Win32 only)")                     \
                                                                             \
-  product(bool, CacheTimeMillis, false,                                     \
-          "Cache os::javaTimeMillis with CacheTimeMillisGranularity")       \
-                                                                            \
-  diagnostic(uintx, CacheTimeMillisGranularity, 50,                         \
-          "Granularity for CacheTimeMillis")                                \
-                                                                            \
   develop(bool, TraceItables, false,                                        \
           "Trace initialization and use of itables")                        \
                                                                             \

src/share/vm/runtime/java.cpp

@@ -390,11 +390,6 @@ void before_exit(JavaThread * thread) {
   StatSampler::disengage();
   StatSampler::destroy();
 
-  // shut down the TimeMillisUpdateTask
-  if (CacheTimeMillis) {
-    TimeMillisUpdateTask::disengage();
-  }
-
 #ifndef SERIALGC
   // stop CMS threads
   if (UseConcMarkSweepGC) {

src/share/vm/runtime/mutex.cpp

@@ -1119,10 +1119,15 @@ Monitor::~Monitor() {
   assert ((UNS(_owner)|UNS(_LockWord.FullWord)|UNS(_EntryList)|UNS(_WaitSet)|UNS(_OnDeck)) == 0, "") ;
 }
 
-void Monitor::ClearMonitor (Monitor * m) {
+void Monitor::ClearMonitor (Monitor * m, const char *name) {
   m->_owner             = NULL ;
   m->_snuck             = false ;
-  m->_name              = "UNKNOWN" ;
+  if (name == NULL) {
+    strcpy(m->_name, "UNKNOWN") ;
+  } else {
+    strncpy(m->_name, name, MONITOR_NAME_LEN - 1);
+    m->_name[MONITOR_NAME_LEN - 1] = '\0';
+  }
   m->_LockWord.FullWord = 0 ;
   m->_EntryList         = NULL ;
   m->_OnDeck            = NULL ;
@@ -1133,7 +1138,7 @@ void Monitor::ClearMonitor (Monitor * m) {
 Monitor::Monitor() { ClearMonitor(this); }
 
 Monitor::Monitor (int Rank, const char * name, bool allow_vm_block) {
-  ClearMonitor (this) ;
+  ClearMonitor (this, name) ;
 #ifdef ASSERT
   _allow_vm_block  = allow_vm_block;
   _rank            = Rank ;
@@ -1145,7 +1150,7 @@ Mutex::~Mutex() {
 }
 
 Mutex::Mutex (int Rank, const char * name, bool allow_vm_block) {
-  ClearMonitor ((Monitor *) this) ;
+  ClearMonitor ((Monitor *) this, name) ;
 #ifdef ASSERT
  _allow_vm_block   = allow_vm_block;
  _rank             = Rank ;

src/share/vm/runtime/mutex.hpp

@@ -82,6 +82,9 @@ class ParkEvent ;
 // *in that order*.  If their implementations change such that these
 // assumptions are violated, a whole lot of code will break.
 
+// The default length of monitor name is choosen to be 64 to avoid false sharing.
+static const int MONITOR_NAME_LEN = 64;
+
 class Monitor : public CHeapObj {
 
  public:
@@ -126,9 +129,8 @@ class Monitor : public CHeapObj {
   volatile intptr_t _WaitLock [1] ;      // Protects _WaitSet
   ParkEvent * volatile  _WaitSet ;       // LL of ParkEvents
   volatile bool     _snuck;              // Used for sneaky locking (evil).
-  const char * _name;                    // Name of mutex
   int NotifyCount ;                      // diagnostic assist
-  double pad [8] ;                       // avoid false sharing
+  char _name[MONITOR_NAME_LEN];          // Name of mutex
 
   // Debugging fields for naming, deadlock detection, etc. (some only used in debug mode)
 #ifndef PRODUCT
@@ -170,7 +172,7 @@ class Monitor : public CHeapObj {
    int  ILocked () ;
 
  protected:
-   static void ClearMonitor (Monitor * m) ;
+   static void ClearMonitor (Monitor * m, const char* name = NULL) ;
    Monitor() ;
 
  public:

src/share/vm/runtime/mutexLocker.cpp

@@ -188,10 +188,6 @@ void mutex_init() {
 
   def(Safepoint_lock               , Monitor, safepoint,   true ); // locks SnippetCache_lock/Threads_lock
 
-  if (!UseMembar) {
-    def(SerializePage_lock         , Monitor, leaf,        true );
-  }
-
   def(Threads_lock                 , Monitor, barrier,     true );
 
   def(VMOperationQueue_lock        , Monitor, nonleaf,     true ); // VM_thread allowed to block on these

src/share/vm/runtime/mutexLocker.hpp

@@ -52,7 +52,6 @@ extern Mutex*   DerivedPointerTableGC_lock;      // a lock to protect the derive
 extern Monitor* VMOperationQueue_lock;           // a lock on queue of vm_operations waiting to execute
 extern Monitor* VMOperationRequest_lock;         // a lock on Threads waiting for a vm_operation to terminate
 extern Monitor* Safepoint_lock;                  // a lock used by the safepoint abstraction
-extern Monitor* SerializePage_lock;              // a lock used when VMThread changing serialize memory page permission during safepoint
 extern Monitor* Threads_lock;                    // a lock on the Threads table of active Java threads
                                                  // (also used by Safepoints too to block threads creation/destruction)
 extern Monitor* CGC_lock;                        // used for coordination between

src/share/vm/runtime/os.cpp

@@ -33,9 +33,6 @@ volatile int32_t* os::_mem_serialize_page = NULL;
 uintptr_t         os::_serialize_page_mask = 0;
 long              os::_rand_seed          = 1;
 int               os::_processor_count    = 0;
-volatile jlong    os::_global_time        = 0;
-volatile int      os::_global_time_lock   = 0;
-bool              os::_use_global_time    = false;
 size_t            os::_page_sizes[os::page_sizes_max];
 
 #ifndef PRODUCT
@@ -44,74 +41,6 @@ size_t os::alloc_bytes = 0;         // # of bytes allocated
 int os::num_frees = 0;              // # of calls to free
 #endif
 
-// Atomic read of a jlong is assured by a seqlock; see update_global_time()
-jlong os::read_global_time() {
-#ifdef _LP64
-  return _global_time;
-#else
-  volatile int lock;
-  volatile jlong current_time;
-  int ctr = 0;
-
-  for (;;) {
-    lock = _global_time_lock;
-
-    // spin while locked
-    while ((lock & 0x1) != 0) {
-      ++ctr;
-      if ((ctr & 0xFFF) == 0) {
-        // Guarantee writer progress.  Can't use yield; yield is advisory
-        // and has almost no effect on some platforms.  Don't need a state
-        // transition - the park call will return promptly.
-        assert(Thread::current() != NULL, "TLS not initialized");
-        assert(Thread::current()->_ParkEvent != NULL, "sync not initialized");
-        Thread::current()->_ParkEvent->park(1);
-      }
-      lock = _global_time_lock;
-    }
-
-    OrderAccess::loadload();
-    current_time = _global_time;
-    OrderAccess::loadload();
-
-    // ratify seqlock value
-    if (lock == _global_time_lock) {
-      return current_time;
-    }
-  }
-#endif
-}
-
-//
-// NOTE - Assumes only one writer thread!
-//
-// We use a seqlock to guarantee that jlong _global_time is updated
-// atomically on 32-bit platforms.  A locked value is indicated by
-// the lock variable LSB == 1.  Readers will initially read the lock
-// value, spinning until the LSB == 0.  They then speculatively read
-// the global time value, then re-read the lock value to ensure that
-// it hasn't changed.  If the lock value has changed, the entire read
-// sequence is retried.
-//
-// Writers simply set the LSB = 1 (i.e. increment the variable),
-// update the global time, then release the lock and bump the version
-// number (i.e. increment the variable again.)  In this case we don't
-// even need a CAS since we ensure there's only one writer.
-//
-void os::update_global_time() {
-#ifdef _LP64
-  _global_time = timeofday();
-#else
-  assert((_global_time_lock & 0x1) == 0, "multiple writers?");
-  jlong current_time = timeofday();
-  _global_time_lock++; // lock
-  OrderAccess::storestore();
-  _global_time = current_time;
-  OrderAccess::storestore();
-  _global_time_lock++; // unlock
-#endif
-}
-
 // Fill in buffer with current local time as an ISO-8601 string.
 // E.g., yyyy-mm-ddThh:mm:ss-zzzz.
 // Returns buffer, or NULL if it failed.
@@ -138,7 +67,7 @@ char* os::iso8601_time(char* buffer, size_t buffer_length) {
     return NULL;
   }
   // Get the current time
-  jlong milliseconds_since_19700101 = timeofday();
+  jlong milliseconds_since_19700101 = javaTimeMillis();
   const int milliseconds_per_microsecond = 1000;
   const time_t seconds_since_19700101 =
     milliseconds_since_19700101 / milliseconds_per_microsecond;
@@ -956,7 +885,6 @@ bool os::set_boot_path(char fileSep, char pathSep) {
     return true;
 }
 
-
 void os::set_memory_serialize_page(address page) {
   int count = log2_intptr(sizeof(class JavaThread)) - log2_intptr(64);
   _mem_serialize_page = (volatile int32_t *)page;
@@ -967,6 +895,8 @@ void os::set_memory_serialize_page(address page) {
   set_serialize_page_mask((uintptr_t)(vm_page_size() - sizeof(int32_t)));
 }
 
+static volatile intptr_t SerializePageLock = 0;
+
 // This method is called from signal handler when SIGSEGV occurs while the current
 // thread tries to store to the "read-only" memory serialize page during state
 // transition.
@@ -974,15 +904,14 @@ void os::block_on_serialize_page_trap() {
   if (TraceSafepoint) {
     tty->print_cr("Block until the serialize page permission restored");
   }
-  // When VMThread is holding the SerializePage_lock during modifying the
+  // When VMThread is holding the SerializePageLock during modifying the
   // access permission of the memory serialize page, the following call
   // will block until the permission of that page is restored to rw.
   // Generally, it is unsafe to manipulate locks in signal handlers, but in
   // this case, it's OK as the signal is synchronous and we know precisely when
-  // it can occur. SerializePage_lock is a transiently-held leaf lock, so
-  // lock_without_safepoint_check should be safe.
-  SerializePage_lock->lock_without_safepoint_check();
-  SerializePage_lock->unlock();
+  // it can occur.
+  Thread::muxAcquire(&SerializePageLock, "set_memory_serialize_page");
+  Thread::muxRelease(&SerializePageLock);
 }
 
 // Serialize all thread state variables
@@ -990,14 +919,12 @@ void os::serialize_thread_states() {
   // On some platforms such as Solaris & Linux, the time duration of the page
   // permission restoration is observed to be much longer than expected  due to
   // scheduler starvation problem etc. To avoid the long synchronization
-  // time and expensive page trap spinning, 'SerializePage_lock' is used to block
-  // the mutator thread if such case is encountered. Since this method is always
-  // called by VMThread during safepoint, lock_without_safepoint_check is used
-  // instead. See bug 6546278.
-  SerializePage_lock->lock_without_safepoint_check();
+  // time and expensive page trap spinning, 'SerializePageLock' is used to block
+  // the mutator thread if such case is encountered. See bug 6546278 for details.
+  Thread::muxAcquire(&SerializePageLock, "serialize_thread_states");
   os::protect_memory( (char *)os::get_memory_serialize_page(), os::vm_page_size() );
   os::unguard_memory( (char *)os::get_memory_serialize_page(), os::vm_page_size() );
-  SerializePage_lock->unlock();
+  Thread::muxRelease(&SerializePageLock);
 }
 
 // Returns true if the current stack pointer is above the stack shadow

src/share/vm/runtime/os.hpp

@@ -66,9 +66,6 @@ class os: AllStatic {
   static address            _polling_page;
   static volatile int32_t * _mem_serialize_page;
   static uintptr_t          _serialize_page_mask;
-  static volatile jlong     _global_time;
-  static volatile int       _global_time_lock;
-  static bool               _use_global_time;
   static size_t             _page_sizes[page_sizes_max];
 
   static void init_page_sizes(size_t default_page_size) {
@@ -88,11 +85,6 @@ class os: AllStatic {
   static bool getenv(const char* name, char* buffer, int len);
   static bool have_special_privileges();
 
-  static jlong  timeofday();
-  static void   enable_global_time()   { _use_global_time = true; }
-  static void   disable_global_time()  { _use_global_time = false; }
-  static jlong  read_global_time();
-  static void   update_global_time();
   static jlong  javaTimeMillis();
   static jlong  javaTimeNanos();
   static void   javaTimeNanos_info(jvmtiTimerInfo *info_ptr);

src/share/vm/runtime/sharedRuntime.cpp

@@ -1486,11 +1486,9 @@ char* SharedRuntime::generate_class_cast_message(
   const char* desc = " cannot be cast to ";
   size_t msglen = strlen(objName) + strlen(desc) + strlen(targetKlassName) + 1;
 
-  char* message = NEW_C_HEAP_ARRAY(char, msglen);
+  char* message = NEW_RESOURCE_ARRAY(char, msglen);
   if (NULL == message) {
-    // out of memory - can't use a detailed message.  Since caller is
-    // using a resource mark to free memory, returning this should be
-    // safe (caller won't explicitly delete it).
+    // Shouldn't happen, but don't cause even more problems if it does
     message = const_cast<char*>(objName);
   } else {
     jio_snprintf(message, msglen, "%s%s%s", objName, desc, targetKlassName);

src/share/vm/runtime/task.cpp

@@ -107,25 +107,3 @@ void PeriodicTask::disenroll() {
     _tasks[index] = _tasks[index+1];
   }
 }
-
-TimeMillisUpdateTask* TimeMillisUpdateTask::_task = NULL;
-
-void TimeMillisUpdateTask::task() {
-  os::update_global_time();
-}
-
-void TimeMillisUpdateTask::engage() {
-  assert(_task == NULL, "init twice?");
-  os::update_global_time(); // initial update
-  os::enable_global_time();
-  _task = new TimeMillisUpdateTask(CacheTimeMillisGranularity);
-  _task->enroll();
-}
-
-void TimeMillisUpdateTask::disengage() {
-  assert(_task != NULL, "uninit twice?");
-  os::disable_global_time();
-  _task->disenroll();
-  delete _task;
-  _task = NULL;
-}

src/share/vm/runtime/task.hpp

@@ -113,13 +113,3 @@ class PeriodicTask: public CHeapObj {
   // The task to perform at each period
   virtual void task() = 0;
 };
-
-class TimeMillisUpdateTask : public PeriodicTask {
- private:
-  static TimeMillisUpdateTask* _task;
- public:
-  TimeMillisUpdateTask(int interval) : PeriodicTask(interval) {}
-  void task();
-  static void engage();
-  static void disengage();
-};

src/share/vm/runtime/thread.cpp

@@ -3085,7 +3085,6 @@ jint Threads::create_vm(JavaVMInitArgs* args, bool* canTryAgain) {
   if (MemProfiling)                   MemProfiler::engage();
   StatSampler::engage();
   if (CheckJNICalls)                  JniPeriodicChecker::engage();
-  if (CacheTimeMillis)                TimeMillisUpdateTask::engage();
 
   BiasedLocking::init();
 

src/share/vm/utilities/vmError.cpp

@@ -170,7 +170,8 @@ static void print_bug_submit_message(outputStream *out, Thread *thread) {
   out->print_raw_cr(Arguments::java_vendor_url_bug());
   // If the crash is in native code, encourage user to submit a bug to the
   // provider of that code.
-  if (thread && thread->is_Java_thread()) {
+  if (thread && thread->is_Java_thread() &&
+      !thread->is_hidden_from_external_view()) {
     JavaThread* jt = (JavaThread*)thread;
     if (jt->thread_state() == _thread_in_native) {
       out->print_cr("# The crash happened outside the Java Virtual Machine in native code.\n# See problematic frame for where to report the bug.");
@@ -249,10 +250,10 @@ void VMError::report(outputStream* st) {
 
   BEGIN
 
-  STEP(10, "(printing unexpected error message)")
+  STEP(10, "(printing fatal error message)")
 
      st->print_cr("#");
-     st->print_cr("# An unexpected error has been detected by Java Runtime Environment:");
+     st->print_cr("# A fatal error has been detected by the Java Runtime Environment:");
 
   STEP(15, "(printing type of error)")