RFR: 8338490: Serial: Move Generation::print_on to subclasses [v2]

[Albert Mingkun Yang]

> Trivial inlining a virtual method to subclasses and some cleanup to related methods.
> 
> The gc-log is slightly updated due to the change of the name of generations. Log before&after shown below:
> 
> 
> # baseline
> 
> [2.417s][debug][gc,heap] GC(0)  def new generation   total 153600K, used 76645K [0x000000060d800000, 0x0000000617ea0000, 0x00000006b3aa0000)
> [2.417s][debug][gc,heap] GC(0)   eden space 136576K,  56% used [0x000000060d800000, 0x00000006122d9538, 0x0000000615d60000)
> [2.417s][debug][gc,heap] GC(0)   from space 17024K,   0% used [0x0000000615d60000, 0x0000000615d60000, 0x0000000616e00000)
> [2.417s][debug][gc,heap] GC(0)   to   space 17024K,   0% used [0x0000000616e00000, 0x0000000616e00000, 0x0000000617ea0000)
> [2.417s][debug][gc,heap] GC(0)  tenured generation   total 341376K, used 0K [0x00000006b3aa0000, 0x00000006c8800000, 0x0000000800000000)
> [2.417s][debug][gc,heap] GC(0)    the space 341376K,   0% used [0x00000006b3aa0000, 0x00000006b3aa0000, 0x00000006c8800000)
> 
> # new
> 
> [9.846s][debug][gc,heap] GC(0)  DefNew     total 153600K, used 71165K [0x000000060d800000, 0x0000000617ea0000, 0x00000006b3aa0000)
> [9.846s][debug][gc,heap] GC(0)   eden space 136576K,  52% used [0x000000060d800000, 0x0000000611d7f708, 0x0000000615d60000)
> [9.846s][debug][gc,heap] GC(0)   from space 17024K,   0% used [0x0000000615d60000, 0x0000000615d60000, 0x0000000616e00000)
> [9.846s][debug][gc,heap] GC(0)   to   space 17024K,   0% used [0x0000000616e00000, 0x0000000616e00000, 0x0000000617ea0000)
> [9.846s][debug][gc,heap] GC(0)  Tenured    total 341376K, used 0K [0x00000006b3aa0000, 0x00000006c8800000, 0x0000000800000000)
> [9.846s][debug][gc,heap] GC(0)    the space 341376K,   0% used [0x00000006b3aa0000, 0x00000006b3aa0000, 0x00000006c8800000)

Albert Mingkun Yang has updated the pull request incrementally with one additional commit since the last revision:

  review

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/20607/files
  - new: https://git.openjdk.org/jdk/pull/20607/files/e9cb6c93..f9be4f79

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20607&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20607&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/20607.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20607/head:pull/20607

PR: https://git.openjdk.org/jdk/pull/20607