void ThreadLocalAllocBuffer::accumulate_statistics_before_gc() {
  global_stats()->initialize();

#ifdef COLORED_TLABS
  if(UseColoredSpaces) {
    for(JavaThread *thread = Threads::first(); thread; thread = thread->next()) {
      //tty->print("early: %p\n", thread);
      thread->tlab(HC_RED).accumulate_statistics();
      thread->tlab(HC_RED).initialize_statistics();
      thread->tlab(HC_BLUE).accumulate_statistics();
      thread->tlab(HC_BLUE).initialize_statistics();
    }
  } else {
    for(JavaThread *thread = Threads::first(); thread; thread = thread->next()) {
      //tty->print("early: %p\n", thread);
      thread->tlab().accumulate_statistics();
      thread->tlab().initialize_statistics();
    }
  }
#else
  for (JavaThread *thread = Threads::first(); thread != NULL; thread = thread->next()) {
    thread->tlab().accumulate_statistics();
    thread->tlab().initialize_statistics();
  }
#endif

  // Publish new stats if some allocation occurred.
  if (global_stats()->allocation() != 0) {
    global_stats()->publish();
    if (PrintTLAB) {
      global_stats()->print();
    }
  }
}
void ThreadLocalAllocBuffer::accumulate_statistics_before_gc() {
  global_stats()->initialize();

  for(JavaThread *thread = Threads::first(); thread; thread = thread->next()) {
    thread->tlab().accumulate_statistics();
    thread->tlab().initialize_statistics();
  }

  // Publish new stats if some allocation occurred.
  if (global_stats()->allocation() != 0) {
    global_stats()->publish();
    if (PrintTLAB) {
      global_stats()->print();
    }
  }
}
size_t ThreadLocalAllocBuffer::initial_desired_size() {
  size_t init_sz = 0;

  if (TLABSize > 0) {
    init_sz = TLABSize / HeapWordSize;
  } else if (global_stats() != NULL) {
    // Initial size is a function of the average number of allocating threads.
    unsigned nof_threads = global_stats()->allocating_threads_avg();

    init_sz  = (Universe::heap()->tlab_capacity(myThread()) / HeapWordSize) /
                      (nof_threads * target_refills());
    init_sz = align_object_size(init_sz);
  }
  init_sz = MIN2(MAX2(init_sz, min_size()), max_size());
  return init_sz;
}
void ThreadLocalAllocBuffer::accumulate_statistics() {
  Thread* thread = myThread();
  size_t capacity = Universe::heap()->tlab_capacity(thread);
  size_t used     = Universe::heap()->tlab_used(thread);

  _gc_waste += (unsigned)remaining();
  size_t total_allocated = thread->allocated_bytes();
  size_t allocated_since_last_gc = total_allocated - _allocated_before_last_gc;
  _allocated_before_last_gc = total_allocated;

  if (PrintTLAB && (_number_of_refills > 0 || Verbose)) {
    print_stats("gc");
  }

  if (_number_of_refills > 0) {
    // Update allocation history if a reasonable amount of eden was allocated.
    bool update_allocation_history = used > 0.5 * capacity;

    if (update_allocation_history) {
      // Average the fraction of eden allocated in a tlab by this
      // thread for use in the next resize operation.
      // _gc_waste is not subtracted because it's included in
      // "used".
      // The result can be larger than 1.0 due to direct to old allocations.
      // These allocations should ideally not be counted but since it is not possible
      // to filter them out here we just cap the fraction to be at most 1.0.
      double alloc_frac = MIN2(1.0, (double) allocated_since_last_gc / used);
      _allocation_fraction.sample(alloc_frac);
    }
    global_stats()->update_allocating_threads();
    global_stats()->update_number_of_refills(_number_of_refills);
    global_stats()->update_allocation(_number_of_refills * desired_size());
    global_stats()->update_gc_waste(_gc_waste);
    global_stats()->update_slow_refill_waste(_slow_refill_waste);
    global_stats()->update_fast_refill_waste(_fast_refill_waste);

  } else {
    assert(_number_of_refills == 0 && _fast_refill_waste == 0 &&
           _slow_refill_waste == 0 && _gc_waste          == 0,
           "tlab stats == 0");
  }
  global_stats()->update_slow_allocations(_slow_allocations);
}
Ejemplo n.º 5
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void ThreadLocalAllocBuffer::accumulate_statistics() {
  size_t capacity = Universe::heap()->tlab_capacity(myThread()) / HeapWordSize;
  size_t unused   = Universe::heap()->unsafe_max_tlab_alloc(myThread()) / HeapWordSize;
  size_t used     = capacity - unused;

  // Update allocation history if a reasonable amount of eden was allocated.
  bool update_allocation_history = used > 0.5 * capacity;

  _gc_waste += (unsigned)remaining();

  if (PrintTLAB && (_number_of_refills > 0 || Verbose)) {
    print_stats("gc");
  }

  if (_number_of_refills > 0) {

    if (update_allocation_history) {
      // Average the fraction of eden allocated in a tlab by this
      // thread for use in the next resize operation.
      // _gc_waste is not subtracted because it's included in
      // "used".
      size_t allocation = _number_of_refills * desired_size();
      double alloc_frac = allocation / (double) used;
      _allocation_fraction.sample(alloc_frac);
    }

    global_stats()->update_allocating_threads();
    global_stats()->update_number_of_refills(_number_of_refills);
    global_stats()->update_allocation(_number_of_refills * desired_size());
    global_stats()->update_gc_waste(_gc_waste);
    global_stats()->update_slow_refill_waste(_slow_refill_waste);
    global_stats()->update_fast_refill_waste(_fast_refill_waste);

  } else {
    assert(_number_of_refills == 0 && _fast_refill_waste == 0 &&
           _slow_refill_waste == 0 && _gc_waste          == 0,
           "tlab stats == 0");
  }

  global_stats()->update_slow_allocations(_slow_allocations);
}