I just increased my swap space with a swap file

/sbin/swapon -s

Filename                        Type            Size    Used    Priority
/dev/hda5                       partition       1044184 0       -1

df -m

Filesystem           1M-blocks      Used Available Use% Mounted on
/dev/hda7                  372        81       272  23% /
/dev/hda2                   46        10        34  22% /boot
/dev/hda6                 9705      2325      6887  26% /home
none                       251         0       250   0% /dev/shm
/dev/hda3                26537      2113     23076   9% /usr
/dev/hda8                  251        64       173  27% /var

su

dd if=/dev/zero of=/usr/extraswap bs=1M count=1024

/sbin/mkswap /usr/extraswap
Setting up swapspace version 1, size = 1048572 KiB

/sbin/swapon /usr/extraswap

/sbin/swapon -s

Filename                        Type            Size    Used    Priority
/dev/hda5                       partition      1044184 0       -1
/usr/extraswap                  file            1048568 0       -2

cp /etc/fstab /etc/fstab.mybackup

emacs /etc/fstab&

diff /etc/fstab /etc/fstab.mybackup
10d9
< /usr/extraswap          none                    swap    sw              0 0