RFR: 8346230: [perf] scalability issue for the specjvm2008::xml.transform workload [v4]

[Vladimir Ivanov]

> The synchronized scope was reduced from whole methods to sections that need hash map access control. The tier1 and jaxp tests are OK. The score of the specjvm2008:xml.transform improved a little bit. On the Xeon 8480+ reported scores are:
> original: 1vCPU - 148.4, 112vCPU - 12743.4, 224vCPU - 13481.31 ops/m
> patched: 1vCPU - 149.77, 112vCPU - 13122.82, 224vCPU - 14751.57 ops/m
> 
> According to the JFR the locking time for XMLReader object reduced from ~27sec to ~20sec for 224vCPU run.

Vladimir Ivanov has updated the pull request incrementally with one additional commit since the last revision:

  8346230 [perf] scalability issue for the specjvm2008::xml.transform workload

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Changes:
  - all: https://git.openjdk.org/jdk/pull/23185/files
  - new: https://git.openjdk.org/jdk/pull/23185/files/95590eb6..9864851b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=23185&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=23185&range=02-03

  Stats: 12 lines in 1 file changed: 6 ins; 6 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/23185.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23185/head:pull/23185

PR: https://git.openjdk.org/jdk/pull/23185