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

[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

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Commit messages:
 - 8372610

Changes: https://git.openjdk.org/jdk/pull/28513/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28513&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8372610
  Stats: 14 lines in 1 file changed: 6 ins; 4 del; 4 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