RFR: 8364081: Shenandoah & GenShen logging improvement [v3]

[Rui Li]

> Fix missing `increment_total_collections` usages in Shenandoah (otherwise, the invocation count is always 0 as shown in https://github.com/openjdk/jdk/pull/26272 overview). 
> 
> Also added some generational information for generational shenandoah logging.
> 
> Shenandoah logging samples:
> 
> 
> ######################
> Shenandoah - Beore GC
> ######################
> [0.161s][debug][gc,heap      ] GC(0) Heap Before GC invocations=0 (full 0):
> [0.161s][debug][gc,heap      ] GC(0)  Shenandoah Heap
> [0.161s][debug][gc,heap      ] GC(0)    100M max, 100M soft max, 100M committed, 40312K used
> [0.161s][debug][gc,heap      ] GC(0)   400 x 256K regions
> [0.161s][debug][gc,heap      ] GC(0)  Status: not cancelled
> [0.161s][debug][gc,heap      ] GC(0)  Reserved region:
> [0.161s][debug][gc,heap      ] GC(0)   - [0x00000000f9c00000, 0x0000000100000000) 
> [0.161s][debug][gc,heap      ] GC(0)  Collection set:
> [0.161s][debug][gc,heap      ] GC(0)   - map (vanilla): 0x0000000000004e70
> [0.161s][debug][gc,heap      ] GC(0)   - map (biased):  0x0000000000001000
> [0.161s][debug][gc,heap      ] GC(0) 
> [0.161s][debug][gc,metaspace ] GC(0) Metaspace Before GC invocations=0 (full 0):
> [0.161s][debug][gc,metaspace ] GC(0)  Metaspace       used 86K, committed 320K, reserved 1114112K
> [0.161s][debug][gc,metaspace ] GC(0)   class space    used 3K, committed 128K, reserved 1048576K
> 
> ######################
> Shenandoah - After GC
> ######################
> [2.179s][debug][gc,heap        ] GC(9) Heap After GC invocations=17 (full 7):
> [2.179s][debug][gc,heap        ] GC(9)  Shenandoah Heap
> [2.179s][debug][gc,heap        ] GC(9)    100M max, 100M soft max, 100M committed, 97113K used
> [2.179s][debug][gc,heap        ] GC(9)   400 x 256K regions
> [2.179s][debug][gc,heap        ] GC(9)  Status: not cancelled
> [2.179s][debug][gc,heap        ] GC(9)  Reserved region:
> [2.179s][debug][gc,heap        ] GC(9)   - [0x00000000f9c00000, 0x0000000100000000) 
> [2.179s][debug][gc,heap        ] GC(9)  Collection set:
> [2.179s][debug][gc,heap        ] GC(9)   - map (vanilla): 0x0000000000004e70
> [2.179s][debug][gc,heap        ] GC(9)   - map (biased):  0x0000000000001000
> [2.179s][debug][gc,heap        ] GC(9) 
> [2.179s][debug][gc,metaspace   ] GC(9) Metaspace After GC invocations=17 (full 7):
> [2.179s][debug][gc,metaspace   ] GC(9)  Metaspace       used 125K, committed 320K, reserved 1114112K
> [2.179s][debug][gc,metaspace   ] GC(9)   class space    used 4K, committed 128K, reserved 1048576K
> 
> 
> Generational Shenandoah logging samples
> 
> #############...

Rui Li has updated the pull request incrementally with one additional commit since the last revision:

  const & print

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/26469/files
  - new: https://git.openjdk.org/jdk/pull/26469/files/1d51fcff..ed455a80

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=26469&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=26469&range=01-02

  Stats: 10 lines in 1 file changed: 6 ins; 3 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/26469.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26469/head:pull/26469

PR: https://git.openjdk.org/jdk/pull/26469