RFR: 8360046: Scalability issue when submitting virtual threads with almost empty tasks [v5]

[Doug Lea]

> This set of updates reduces contention-based performance loss under heavy over-subscription, while also improving perfomance more generally.

Doug Lea has updated the pull request incrementally with one additional commit since the last revision:

  Avoid underutilization on resize

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/26479/files
  - new: https://git.openjdk.org/jdk/pull/26479/files/c16c1282..8ecf3987

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=26479&range=04
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=26479&range=03-04

  Stats: 109 lines in 1 file changed: 23 ins; 19 del; 67 mod
  Patch: https://git.openjdk.org/jdk/pull/26479.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26479/head:pull/26479

PR: https://git.openjdk.org/jdk/pull/26479