It seems that some file being run via mod_perl is eating up my memory. Some apache child processes grow to a value around 350MB. The more time goes by, the more childs reach this value.
As the problems started (some time ago) when I started using mod_perl, I guess there is a Perl file which is wasting RAM and every time a URL which uses this file is requested, the serving Apache child grows.
I tried to measure the memory usage difference between start and end of the handler() subs but didn't find anyone who claims to be responsible.
Any hints would be helpful.