RFR: 8281946: VM.native_memory should report size of shareable memory [v11]

[Ioi Lam]

On Wed, 14 Dec 2022 18:37:34 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

src/hotspot/share/services/memReporter.cpp line 207:

> 205:       output()->print(", readonly=" SIZE_FORMAT "%s",
> 206:                       amount_in_current_scale(read_only_bytes), scale);
> 207:     }

Two days ago, I made a request for change in here but that seems to have disappeared :-(

The read_only_bytes is relevant to mtClassShared only, so the code from lines 174-178 should be moved inside this "if" block.

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