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ef02fb15a3
When allocating DSM segments with posix_fallocate() on Linux (see commit
899bd785), report this activity as a wait event exactly as we would if
we were using file-backed DSM rather than shm_open()-backed DSM.
Author: Thomas Munro
Discussion: https://postgr.es/m/CA%2BhUKGKCSh4GARZrJrQZwqs5SYp0xDMRr9Bvb%2BHQzJKvRgL6ZA%40mail.gmail.com