RFR: 8327042: G1: Parallelism used for redirty logged cards needs better control. [v2]

[Ivan Walulya]

> Please review this change that provides better scaling of the `RedirtyLoggedCardsTask` with high number of worker threads. In the current implementation, the threads  contend for access to the Log Buffers through a single BufferNode resulting in a bottleneck as we increase the threads. The cost per card is pretty low, thus the work distribution overhead dominates the task. 
> 
> The new approach preserves the BufferNodeList states from G1ParScanThreadState, which effectively act as fingers (short cuts) into the list of buffers within `G1RedirtyCardsQueueSet`. We use these  BufferNodeList states to distribute BufferNodes for "redirtying" to the worker threads. By creating multiple points of access to the buffers, this method significantly reduces synchronization overheads and eliminates the bottleneck.
> 
> I have attached results from the Big Ram Tester microbenchmark on a server that spins up 163 worker threads for the `RedirtyLoggedCardsTask`
> 
> ![prepare_mixed](https://github.com/openjdk/jdk/assets/69453999/7120aa59-9b84-4e32-ac58-129ff31bb668)
> ![normal](https://github.com/openjdk/jdk/assets/69453999/7aafb72e-8f18-410d-9f1b-0c0adcd78b03)
> ![mixed](https://github.com/openjdk/jdk/assets/69453999/8a115d9c-56d3-4654-931e-1fa84987915d)
> ![concurrent_start](https://github.com/openjdk/jdk/assets/69453999/783d8804-b7b8-42a7-976c-4c217636157b)
> 
> 
> Testing: Tier 1-3

Ivan Walulya has updated the pull request incrementally with one additional commit since the last revision:

  Review

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Changes:
  - all: https://git.openjdk.org/jdk/pull/17963/files
  - new: https://git.openjdk.org/jdk/pull/17963/files/73f514b5..45b3032d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17963&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17963&range=00-01

  Stats: 7 lines in 3 files changed: 3 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/17963.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17963/head:pull/17963

PR: https://git.openjdk.org/jdk/pull/17963