How to find out memory usage of a particular process from vmcore?

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Issue

Server was unresponsive and manually crashed to generate vmcore.
How to find out memory usage of a particular process from the vmcore?
Host was hung because of OOM, rebooted the host and fixed the issue, let us know the RCA.

Environment

Red Hat Enterprise Linux 3,4,5 and 6
Crash (all versions)

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