BUG #19096: Hugepages configuration is probably not reserving the allocated number of pages

The following bug has been logged on the website:

Bug reference:      19096
Logged by:          dex terity
Email address:      szmscy4nfxk@protonmail.com
PostgreSQL version: 18.0
Operating system:   Debian 12, 13
Description:

Thanks for Postgresql
I have been exploring hugepages functionality in PG and other applications,
found out there's actually a worthy performance improvement. The problem is
that while other applications such as libvirt, php all play nice with HP, if
I launch PG with HP then the next apps will show problems, even though the
number of pages is in excess. Without PG it is possible to run any
combination of apps and instances without problems. PG runs happy when alone
or with one libvirt vm. One thing I noticed is PG does not reserve the full
number of pages when started... maybe that's the problem.
Regards