Since each getty instance is the exact same binary, with the exact same
libraries, Linux is smart enough to reuse the same memory for each
instance and just map them repeatedly into the address space of each new
process.
The only per-getty overhead is whatever heap allocations getty does, and
space for the stack; this is a tiny amount of memory in the order of
kilobytes not the megabytes you claim.
** Changed in: upstart (Ubuntu)
Status: New => Won't Fix
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Disable tty2-tty6 to save 11 megs memory on livecd
https://bugs.launchpad.net/bugs/501241
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