Create a 2G swap partition which take effect automatically at boot-start, and it should not affect the original swap partition.

# fdisk /dev/sda

p
(check Partition table)
n
(create new partition: press e to create extended partition, press p to create the main partition, and the extended partition is further divided into logical partitions) Enter
+2G
t
l
W
partx -a /dev/sda
partprobe
mkswap /dev/sda8

Copy UUID
swapon -a
vim /etc/fstab
UUID=XXXXX swap swap defaults 0 0

(swapon -s)