Survivor space class historgram print (know your bad garbage)

[Tony Printezis]

No current plans to integrate this. But this is something we could 
consider as part of our ongoing effort to support Mission Control.

Tony

On 11/16/2011 7:01 PM, Srinivas Ramakrishna wrote:
> AFAR, it was not integrated at that time because of the performance 
> impact even when the feature was turned off.
> I believe it would be possible to refactor the code, at some cost, to 
> get this to work without that performance
> impact, but that didn't get done. It might be time to revisit that 
> code and do the requisite refactoring. Tony et al?
>
> -- ramki
>
>
> On Wed, Nov 16, 2011 at 3:45 PM, Michal Frajt <michal at frajt.eu 
> <mailto:michal at frajt.eu>> wrote:
>
>     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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