PermGen Crash fixer?

Hey there, I am running a server with a few mods on it.
And every now and again, it will crash with the error "Out of PermGen Space", and this server is running with the max PermGen my server host can offer...
So, what I am looking for, if it exists, is a plugin which can solve this... I dunno how it would work, whether it would clear a cache, or something (I know nothing of PermGen). But something that could maybe stop, or make the crashes less frequent.

If there is a plugin that can do that, could you please link me it, because when searching through bukkit forums for PermGen I can only find people reporting crashes due to it.
Or if they're aren't any plugins, but there are fixes, that would also be great

Thanks a lot
-Jordan

 

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