Function RoundUpToNearest

tensorflow/stream_executor/cuda/redzone_allocator.cc:37–39

// then multiplying by the divisor. For example: RoundUpToNearest(13, 8) => 16
template <typename T>
static T RoundUpToNearest(T value, T divisor) {
  return tensorflow::MathUtil::CeilOfRatio(value, divisor) * divisor;
}

// The size of the redzone at the end of the user buffer is rounded up to a
// multiple of kRhsRedzoneAlign.  This simplifies the implementation a bit.