Method getAllocationClassId

cachelib/allocator/memory/MemoryPool.cpp:194–209

}

ClassId MemoryPool::getAllocationClassId(uint32_t size) const {
  if (size > acSizes_.back() || size == 0) {
    throw std::invalid_argument(
        fmt::format("Invalid size for alloc {} ", size));
  }

  // can operate without holding the mutex since the vector does not change.
  const auto it = std::lower_bound(acSizes_.begin(), acSizes_.end(), size);

  // we already checked for the bounds.
  XDCHECK(it != acSizes_.end());

  const auto idx = std::distance(acSizes_.begin(), it);
  XDCHECK_LT(static_cast<size_t>(idx), ac_.size());
  return static_cast<ClassId>(idx);
}

ClassId MemoryPool::getAllocationClassId(const void* memory) const {
  // find the slab for this allocation and the header for the slab. None of