First project (example) using hugepage 1G. Centos Linux 3.10.0-1127.el7.x86_64.
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Backup files to /home/user/grub_backup/etc_default_grub - grub /home/user/grub_backup/boot_efi_EFI_centos - grub.cfg
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Add to /etc/default/grub parameters: hugepagesz=1g hugepages=64 default_hugepagesz=1g
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grub2-mkconfig -o /boot/efi/EFI/centos/grub.cfg
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Reboot
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dmesg logs that allocate 13 pages: HugeTLB: allocating 64 of page size 1 GB failed. Only allocated 13 hugepages.