How to track down a memory leak?

I think one of my plug-ins may be leaking memory (one of the plug-ins I coded) in production use. Any idea/suggestions/tips how one goes about tracking down a memory leak in a plug-in? Running TK Linux as host.

Thanks!

P.S. Can't turn the plug-ins off because it's a production environment and the content would display very, very poorly if I did. Argh.