Survivor space class historgram print (know your bad garbage)

[Michal Frajt]

Hi,

 

Is there a way to get printed a survivor space class histogram on every
minor collection run? Tony once provided us a special jdk build containing
this feature but it got never integrated as a print flag into the main
hotspot version. It was very useful for understanding and identifying
promoted objects to the old gen. Additionally we were looking to get a class
histogram print for the eden space but there was no easy way to implement
it. The eden space class histogram would help to identify garbage invoking
minor collection runs. It could be as well used to check the impact of the
scalar replacements.

 

Would it be possible to reimplement both histogram prints?

 

Thanks,

Michal

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