The following documentation comment has been logged on the website:
Page: https://www.postgresql.org/docs/13/kernel-resources.html
Description:
It seems that the huge_pages parameter is ignored when shared_memory_type is
sysv. The server successfully starts with huge_pages=on, but actually
doesn't use huge pages (relying on /proc/meminfo). I think that this is
worth mentioning in the "Linux Huge Pages" section.