swapoff

[Russell Coker]

In /etc/rc.d/init.d/halt the swap is disabled before any file systems are 
umounted.

Is there any reason why we can't have "umount -a -t tmpfs" before doing the 
swapoff?  If you have a tmpfs file system with a large amount of data (more 
than RAM) then "swapoff -a" is not going to give a good result.

With a default configuration /dev/shm will be half of RAM, which on a modern 
laptop will be at least 256M and maybe 512M.  If that has been paged out (EG 
from running memory hungry programs such as Firefox) then paging that in from 
a slow laptop hard disk (and needlessly draining the battery) on shutdown is 
a bad idea when the data can be discarded by umounting the file system.

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