En résumé (Smart Debian 11) :
# swapon --show
NAME TYPE SIZE USED PRIO
/swapfile file 512M 0B -2
# swapoff -a
# fallocate -l 1G /swapfile
# chmod 600 /swapfile
# mkswap /swapfile
# swapon /swapfile
# swapon --show
NAME TYPE SIZE USED PRIO
/swapfile file 1024M 0B -2
akenad 