Method ReleaseToCentralCache

libs/tcmalloc-1.4/src/thread_cache.cc:213–232

Remove some objects of class "cl" from thread heap and add to central cache

// Remove some objects of class "cl" from thread heap and add to central cache
void ThreadCache::ReleaseToCentralCache(FreeList* src, size_t cl, int N) {
  ASSERT(src == &list_[cl]);
  ASSERT(N >= 0);
  if (static_cast<unsigned int>(N) > src->length()) N = src->length();
  size_t delta_bytes = N * Static::sizemap()->ByteSizeForClass(cl);

  // We return prepackaged chains of the correct size to the central cache.
  // TODO: Use the same format internally in the thread caches?
  int batch_size = Static::sizemap()->num_objects_to_move(cl);
  while (N > batch_size) {
    void *tail, *head;
    src->PopRange(batch_size, &head, &tail);
    Static::central_cache()[cl].InsertRange(head, tail, batch_size);
    N -= batch_size;
  }
  void *tail, *head;
  src->PopRange(N, &head, &tail);
  Static::central_cache()[cl].InsertRange(head, tail, N);
  size_ -= delta_bytes;
}

// Release idle memory to the central cache
void ThreadCache::Scavenge() {