Making sence of /proc/meminfo

All,

I'm trying to make sense of /proc/meminfo. The numbers don't seem to add
up. I'm ultimately trying to create a stacked graph in Cacti where:
      memused + MemFree + (Cached + Buffers) = MemTotal

The best documentation of /proc/meminfo I could find is at:
http://lwn.net/Articles/28345/
Is here a better source of meminfo documentation out there?

Here's the meminfo output from one of my servers for reference:
# cat /proc/meminfo
                total:              used:                free:      
shared:     buffers:     cached:
Mem:    921686016   616235008    305451008        0   70254592  424218624
Swap:   1998700544   60358656  1938341888
MemTotal:         900084 kB
MemFree:          298292 kB
MemShared:                0 kB
Buffers:                68608 kB
Cached:             372816 kB
SwapCached:      41460 kB
Active:               311864 kB
Inactive:             189684 kB
HighTotal:                    0 kB
HighFree:                     0 kB
LowTotal:          900084 kB
LowFree:           298292 kB
SwapTotal:      1951856 kB
SwapFree:       1892912 kB

Thanks,
Rich B.
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