wm: doc

ref: efcca0ca7d23a006f148346186779a3ed64be0c5
dir: /ramfs.ms/

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.HTML Memory file system
.TL
Memory file system
.NH
General notes
.LP
While ramfs is pretty fast, it's not optimal since it's single threaded.
By default it has a maximum size limit of 768MB, if you need more,
pass
.CW -p
flag.
It also can end up filling your memory very quickly. be careful.
.NH
using ramfs instead of /tmp by default
.LP
To use ramfs by default for /tmp, 
replace these two lines in $home/lib/profile:
.P1
if(! syscall create /tmp/xxx 1 0666 >[2]/dev/null)
	ramfs	# in case we're running off a cd
.P2
With these lines:
.P1
ramfs
bind /tmp /usr/$user/tmp
.P2
a use case would be if you don't want to use disk.