RFR: 8372610: G1: JDK-8297692 broke code roots scan measurements [v2]

[Thomas Schatzl]

> Hi all,
> 
>   please review this change that fixes "Code Root Scan" logging - a wrong scope for the timing measurements made these values always print `0.00` and the duration moved to the "Other time" category.
> 
> E.g. without patch:
> 
> 
> [1.121s][debug][gc,phases] GC(7)     Code Root Scan (ms):           Min: 0.00, Avg: 0.00, Max: 0.00, Diff: 0.00, Sum: 0.00, Workers: 4
> [1.485s][debug][gc,phases] GC(8)     Code Root Scan (ms):           Min: 0.00, Avg: 0.00, Max: 0.00, Diff: 0.00, Sum: 0.00, Workers: 8
> [1.715s][debug][gc,phases] GC(9)     Code Root Scan (ms):           Min: 0.00, Avg: 0.00, Max: 0.00, Diff: 0.00, Sum: 0.00, Workers: 8
> 
> 
> with patch:
> 
> 
> [1.392s][debug][gc,phases] GC(7)     Code Root Scan (ms):           Min: 0.00, Avg: 0.03, Max: 0.12, Diff: 0.12, Sum: 0.21, Workers: 8
> [1.638s][debug][gc,phases] GC(8)     Code Root Scan (ms):           Min: 0.00, Avg: 0.03, Max: 0.15, Diff: 0.15, Sum: 0.26, Workers: 8
> [1.862s][debug][gc,phases] GC(9)     Code Root Scan (ms):           Min: 0.00, Avg: 0.03, Max: 0.16, Diff: 0.15, Sum: 0.26, Workers: 8
> 
> 
> Testing: gha, local checking
> 
> Thanks,
>   Thomas

Thomas Schatzl has updated the pull request incrementally with one additional commit since the last revision:

  * reformatting

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/28513/files
  - new: https://git.openjdk.org/jdk/pull/28513/files/a088eb34..d6bb1fe9

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=28513&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=28513&range=00-01

  Stats: 5 lines in 1 file changed: 2 ins; 3 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/28513.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28513/head:pull/28513

PR: https://git.openjdk.org/jdk/pull/28513