why perm generation is continuously increasing?

[Li Li]

hi all,
    I found our application's perm generation size is continuously
increasing and will reach 100%(we limit maxPermSize to 256MB) and perform a
full gc(which will pause for 10s).after gc, perm size usage falls to  about
50% and again increasing. what kind of objects will be allocated to perm
generation? we don't use reflection in our application.
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