RFR: 8366082: Improve queue size computation in CPU-time sampler [v2]

[Johannes Bechberger]

> Improve the sample queue size computation for the CPU-time sampler by increasing the size dynamically when needed, but keeping the default size small.

Johannes Bechberger has updated the pull request incrementally with one additional commit since the last revision:

  Add queue locking on thread termination

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Changes:
  - all: https://git.openjdk.org/jdk/pull/26926/files
  - new: https://git.openjdk.org/jdk/pull/26926/files/1c7b5b82..97669fe5

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=26926&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=26926&range=00-01

  Stats: 3 lines in 1 file changed: 2 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/26926.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26926/head:pull/26926

PR: https://git.openjdk.org/jdk/pull/26926