On Mon, Mar 20, 2023 at 01:54:46PM +0900, Michael Paquier wrote:
> The main advantage of a read-only GUC over a function is that users
> would not need to start a postmaster to know if huge pages would be
> active or not. This is the main reason why a GUC would be a better
> fit, in my opinion, because it makes for a cheaper check, while still
> allowing a SQL query to check the value of the GUC.
[ Should have read more carefully ]
.. Which is something you cannot do with -C because mmap() happens
after the runtime-computed logic for postgres -C. It does not sound
right to do the mmap() for a GUC check, so indeed a function may be
more adapted rather than move mmap() call a bit earlier in the
postmaster startup sequence.
--
Michael