I often heard that we can use sar to see if there are paging
or swapping is happening.

but i don't have a feeling which means bad,

if 1 atch/s mean bad, or more than 1000 atch/s means bad?

can somebody tell me more about

sar -p
atch/s
pgin/s
ppgin/s
pflt/s
vflt/s
slock/s

sar -w
swpin/s
bswin/s
swpot/s
bswot/s
pswch/s

sar -r
freemem
freeswap

sar -g
pgout/s
ppgout/s
pgfree/s
pgscan/s
%ufs_ipf

PLEASE don't just give me the meaning of those items, i can
get it from unix man, i want to know what value means bad.
what means really bad, something like that.
thanks.