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On RHEL6, how can a single process have more residential memory (RSS in ps output) than the Committed_AS field in /proc/meminfo shows for the whole system?

Solution Unverified - Updated 2015-08-06T07:33:27+00:00 -

Issue

On Red Hat Enterprise Linux (RHEL) 6, how can a single process have more residential memory (RSS in ps output) than the Committed_AS field in /proc/meminfo shows for the whole system?
Does Committed_AS in /proc/meminfo show differences between Red Hat Enterprise Linux (RHEL) 5 and RHEL6?
Committed_AS did show useful values on RHEL5, why is that different on RHEL6?

Environment

Red Hat Enterprise Linux (RHEL) 6
memory management and accounting

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