RFR(M): 8243392: Remodel CDS/Metaspace storage reservation

[Thomas Stüfe]

(trimmed down the list of recipients)


> If you have a running foreground JVM in your Linux terminal, you can type
> "Ctrl-\" and see this. E.g.,
>
>
Oh, backslash. I tried backspace. My error.


> $ java -cp . SleepForever
> <...>
> Heap
>  garbage-first heap   total 1048576K, used 824K [0x0000000412000000,
> 0x0000000800000000)
>   region size 8192K, 1 young (8192K), 0 survivors (0K)
>  Metaspace       used 143K, capacity 4486K, committed 4864K, reserved
> 1056768K
>   class space    used 6K, capacity 386K, committed 512K, reserved 1048576K
>
>
Note that this output is not from NMT and so the numbers are not affected
by the NMT bug. Only the jcmd VM.native_memory output is affected.


> Actually I see that the current output is not correct -- class space
> doesn't include the CDS sizes :-(
>
>
I think I'like to keep CDS and CCS separate in the output for a number of
reasons. One is that CCSSize only applies to CCS. But more important, CDS
can be shared and CCS not.

But we may print out CDS too in this output, in a separate line.

Cheers, Thomas