This thread has put me off the <Perl> idea:
Perl sections and restart leaks

Re: Memory usage on reload and graceful -- still broken?
by Doug MacEachern

>  You got me!  I have <Perl> sections ... but I didn't know
>  it was such a crime.  Pretty bizarre behavior if you ask me.

it's not a crime, but if you're running Perl code during restart there's a
strong chance you'll be growing the server size.  i agree 1M is bizarre
though.