Reducing the swap size

swapoff -va
lvchange -an /dev/lnxswap_vg/lv_swap (Considering lnxswap_vg as the volume group and lv_swap as the logical volume)
lvreduce -L -8G /dev/lnxswap_vg/lv_swap (Considering we are reducing 8 GB)
lvchange -ay /dev/lnxswap_vg/lv_swap
mkswap /dev/lnxswap_vg/lv_swap
swapon -va
free -m