[RFC] Should "SHOW huge_pages" display the effective value "off" when the huge page is unavailable?

Hello, all

Could you give me your opinions on whether the SHOW command should display the effective value or the specified value for huge_pages? During the review of "Supporting huge_pages on Windows", which is now shifted to CommitFest 2017-3, Magnus gave me a comment that the huge_page variable should retain the value "try" when the huge page is not available on the machine and the server falls back to huge_page=off. The Linux version does so.

I don't have a strong opinion on that, but I think a bit that it would be better to reflect the effective setting, i.e. SHOW displays huge_pages as off, not try. Otherwise, the user cannot know whether the huge page setting is effective.

One parameter that behaves similarly is wal_buffers. When wal_buffers is set to -1 (default), "SHOW wal_buffers" displays the actual size, not -1. But I didn't find any other parameters like this.

Regards
Takayuki Tsunakawa