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
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