[vserver] vserver guest memory usage: cache/buffers?

Hi,

finally I managed memory limits to work using the old way
using rss.hard and rss.soft (for whatever reason, cgroups
simply did not work for me). But I'm a little surprised how
memory is used/reported in this version (2.3.0.36.32):

vs6a / # free
         total used free shared buffers cached
Mem: 524288 160324 363964 0 0 158424
-/+ buffers/cache: 1900 522388
Swap: 524288 0 524288

I'm running one more older vserver-host (2.2.0.7), and there
I never get anything for "cached":

vs6b / # free
         total used free shared buffers cached
Mem: 262144 6556 255588 0 0 0
-/+ buffers/cache: 6556 255588
Swap: 786432 0 786432

I also see RSS-memory usage as reported by vserver-stat is
now much higher:

(new) vserver-stat:
CTX PROC VSZ RSS userTIME sysTIME UPTIME NAME
6000 3 88.5M 155.9M 0m15s54 0m01s94 8m11s53 vs6a

(old) vserver-stat:
CTX PROC VSZ RSS userTIME sysTIME UPTIME NAME
6000 3 90.7M 4M 0m01s57 0m00s65 1d03h06 vs6b

There is absolutely the same software running (namely nothing
but init, cron and syslog-ng), yet the old vserver-guest takes
just 4MB of RSS, the new one takes 156MB! This corresponds
with ~150MB used for disk-cache.

Unfortunatelly, I can't compare memory usage of vserver-hosts,
as there is different software running. So my question is:
Was something changed in caching, concerning vserver-guests
recently? Was it "moved" from vserver-host to vserver-guests?

Jarry

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