This was a question during JDK-8072070 review. The code in StackOverflow::initialize_stack_zone_sizes() multiplies Stack{Red,Yellow,Reserved,Shadow}Pages by "alignment", while that is actually just a "unit".

  product_pd(intx, StackYellowPages, \
          "Number of yellow zone (recoverable overflows) pages of size " \
          "4KB. If pages are bigger yellow zone is aligned up.") \
          range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5)) \

We can rename it for clarity.