RFR: 8281946: VM.native_memory should report size of shareable memory [v4]

[Matias Saavedra Silva]

On Mon, 5 Dec 2022 22:00:52 GMT, Matias Saavedra Silva <matsaave at openjdk.org> wrote:

>> The native memory reporting has been improved to also include the amount of shareable (read only) data. Verified with test tiers 1,2, and 4.
>> 
>> Sample output:
>> 
>> Total: reserved=33890498670, committed=2360907886
>>        malloc: 75159662 #26118
>>        mmap:   reserved=33815339008, committed=2285748224
>> .............
>> -        Shared class space (reserved=16777216, committed=13545472, readonly=8315472)
>>                             (mmap: reserved=16777216, committed=13545472) 
>>  
>> -               Arena Chunk (reserved=441792, committed=441792)
>>                             (malloc=441792)
>
> Matias Saavedra Silva has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Ioi comments

Since there is no guarantee that the readonly field will be accurate, the test was adjusted to allow "readonly=..." to be included in the output but only for "Shared class space" so long as the RO region is actually read only.

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PR: https://git.openjdk.org/jdk/pull/11401