Function os_malloc

common/sys/alloc.cpp:181–205

  }

  void* os_malloc(size_t bytes, bool& hugepages)
  {
    if (bytes == 0) {
      hugepages = false;
      return nullptr;
    }

    /* try direct huge page allocation first */
    if (isHugePageCandidate(bytes)) 
    {
      int flags = MEM_COMMIT | MEM_RESERVE | MEM_LARGE_PAGES;
      char* ptr = (char*) VirtualAlloc(nullptr,bytes,flags,PAGE_READWRITE);
      if (ptr != nullptr) {
        hugepages = true;
        return ptr;
      }
    } 

    /* fall back to 4k pages */
    int flags = MEM_COMMIT | MEM_RESERVE;
    char* ptr = (char*) VirtualAlloc(nullptr,bytes,flags,PAGE_READWRITE);
    if (ptr == nullptr) throw std::bad_alloc();
    hugepages = false;
    return ptr;
  }

  size_t os_shrink(void* ptr, size_t bytesNew, size_t bytesOld, bool hugepages) 
  {