We've got several users running on Lycos virtual servers, which are some kind of vserver, I think.
Here's what /proc/meminfo has:
[root@clanwelt webmin]# cat /proc/meminfo
MemTotal: 524288 kB
MemFree: 141248 kB
Buffers: 0 kB
Cached: 1288224 kB
SwapCached: 186900 kB
Active: 3218712 kB
Inactive: 348952 kB
HighTotal: 0 kB
HighFree: 0 kB
LowTotal: 524288 kB
LowFree: 141248 kB
SwapTotal: 9715712 kB
SwapFree: 8927824 kB
Dirty: 0 kB
Writeback: 0 kB
Mapped: 2643764 kB
Slab: 277216 kB
CommitLimit: 73630856 kB
Committed_AS: 7579820 kB
PageTables: 35444 kB
VmallocTotal: 118776 kB
VmallocUsed: 35424 kB
VmallocChunk: 83188 kB
Which looks pretty sane, except maybe the CommitLimit. But, the memory reported by the System Information page is wonky:
512 MB total, -821088256 bytes used
Obviously, the graph is also screwy (shoots way off the end of the page).