RFR: 8338490: Serial: Move Generation::print_on to subclasses

[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)

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

Commit messages:
 - s1-print-on

Changes: https://git.openjdk.org/jdk/pull/20607/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20607&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8338490
  Stats: 55 lines in 7 files changed: 16 ins; 26 del; 13 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