创建文件：
# fallocate -l 4G /swapfile
# chmod 600 /swapfile
# mkswap /swapfile
# swapon /swapfile
编辑/etc/fstab文件。添加：/swapfile none swap defaults 0 0
编辑/etc/mkinitcpio.conf文件：
HOOKS="... block lvm2 resume filesystems ..."
# mkinitcpio -p linux
# filefrag -v /swapfile
查找偏移指针：
Filesystem type is: ef53
File size of /swapfile is 4294967296 (1048576 blocks of 4096 bytes)
ext: logical_offset: physical_offset: length: expected: flags:
0: 0.. 0: .. 38912: 1:
1: 1.. 22527: 38913.. 61439: 22527: unwritten
2: 22528.. 53247: 899072.. 929791: 30720: 61440: unwritten
# ls -l /dev/disk/by-uuid/ 查看swapfile文件所在盘的UUID。
lrwxrwxrwx 1 root root 10 Aug 8 19:22 415bb7cf-5a71-4481-a832-c789643ce12c -> ../../sda4
GRUB配置：
# vim /etc/default/grub
GRUB_CMDLINE_LINUX_DEFAULT="resume=/dev/disk/by-uuid/415bb7cf-5a71-4481-a832-c789643ce12c resume_offset= quiet"
参考：https://wiki.archlinux.org/index.php/Hibernate#Hibernation_into_swap_file