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Until now max_files_per_process=N limited each backend to open N files in total (minus a safety factor), even if there were already more files opened in postmaster and inherited by backends. Change max_files_per_process to control how many additional files each process is allowed to open. The main motivation for this is the patch to add io_method=io_uring, which needs to open one file for each backend. Without this patch, even if RLIMIT_NOFILE is high enough, postmaster will fail in set_max_safe_fds() if started with a high max_connections. The cause of the failure is that, until now, set_max_safe_fds() subtracted the already open files from max_files_per_process. Reviewed-by: Noah Misch <noah@leadboat.com> Discussion: https://postgr.es/m/w6uiicyou7hzq47mbyejubtcyb2rngkkf45fk4q7inue5kfbeo@bbfad3qyubvs Discussion: https://postgr.es/m/CAGECzQQh6VSy3KG4pN1d=h9J=D1rStFCMR+t7yh_Kwj-g87aLQ@mail.gmail.com