Survivor space class historgram print (know your bad garbage)

[Srinivas Ramakrishna]

Yes, that seems like a good place to expose such functionality. The
question of refactoring to allow
the stats gathering to happen at low cost when disabled of course still
remains, I guess.

thanks!
-- ramki

On Thu, Nov 17, 2011 at 5:10 AM, Tony Printezis
<tony.printezis at oracle.com>wrote:

>  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> 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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>>
>>
>
>
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