RFR: 8036703: Add trace event with statistics for the metaspace chunk free lists

[Erik Gahlin]

Metadata looks good

Erik

rik Helin skrev 2014-03-06 10:35:
> Hi all,
>
> this patch adds a new trace event - 
> vm/gc/metaspace/chunk_free_list_summary for getting statistics for 
> metaspace's chunk free lists. The event contains the numbers of chunks 
> in the free list and the size of the chunks in the free lists. This 
> information is provided for all different kinds of chunks - special, 
> small, medium and humongous.
>
> This information will be useful when diagnosing fragmentation issues 
> in metaspace.
>
> Webrev:
> http://cr.openjdk.java.net/~ehelin/8036703/webrev.00/
>
> Enhancement:
> https://bugs.openjdk.java.net/browse/JDK-8036703
>
> Testing:
> - JFR JTREG tests
> - JPRT
> - Manually verifying that the numbers look correct by looking at
>   recordings from small test cases.
>
> Thanks,
> Erik