RFR: 8335167: Test runtime/Thread/TestAlwaysPreTouchStacks.java failed with Expected a higher ratio between stack committed and reserved

[Afshin Zafari]

The test program runs once with PreTouch and another without PreTouch stacks. For each run the amounts of reserved and committed stack regions are held and then compared the ratio of with and without PreTouch. The ratio of PreTouch test should be greater than the other (because there will be higher committed regions due to pre-touching the pages).

The specific test is run on linux-x64, windows-x64 and macosx-aarch64 in tiers1-5.

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Commit messages:
 - 8335167: Test runtime/Thread/TestAlwaysPreTouchStacks.java failed with Expected a higher ratio between stack committed and reserved
 - 8335167: Test runtime/Thread/TestAlwaysPreTouchStacks.java failed with Expected a higher ratio between stack committed and reserved

Changes: https://git.openjdk.org/jdk/pull/20531/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20531&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8335167
  Stats: 160 lines in 2 files changed: 70 ins; 73 del; 17 mod
  Patch: https://git.openjdk.org/jdk/pull/20531.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20531/head:pull/20531

PR: https://git.openjdk.org/jdk/pull/20531