RFR: JDK-8290868: NMT: MallocSiteTable statistics improvements

[Thomas Stuefe]

On Fri, 22 Jul 2022 19:03:25 GMT, Zhengyu Gu <zgu at openjdk.org> wrote:

>> Smallish improvement/simplification for the MallocSiteTable statistics.
>> 
>> Instead of printing the full chain length distribution, which is not very helpful, we now print number of empty slots, medium bucket length, and max. bucket chain length. As a bonus, coding gets simpler.
>> 
>> Looks like this now:
>> 
>> thomas at starfish:~$ jcmd spring-petclinic VM.native_memory statistics
>> 70863:
>> Native Memory Tracking Statistics:
>> ...
>> 
>> Bucket chain length distribution:
>> unused:  1
>> longest: 15
>> median:  6
>
> Marked as reviewed by zgu (Reviewer).

Thanks @zhengyu123  and @RealLucy.

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PR: https://git.openjdk.org/jdk/pull/9611