#1 top location is <unknown> about aprof HOT 2 OPEN

Hi! Could you provide more data, please?
What kind of program did you analyze? Maybe you have a guess what kind of code did these allocations?
Can you reproduce the problem on some publicly available code?

from aprof.

It is hard to tell this kind of problem "by picture", but my own experience is that "unknown" locations are usually result from static calls that point to one class in invoker's bytecode, but get actually resolved to its superclass in run time. This can happen in java when your code is compiled against one version of some library, but is run against another version that had moved the correspoinding static method up its method hierarhy. You'll need to explicity add the corresponding method to the list of tracked ones. Figuring this out is usually non-trivial though.

from aprof.