8303154: Investigate and improve instruction cache flushing during compilation

[GoeLin]

I backport this for parity with 17.0.9-oracle.

---

Progress

• Change must not contain extraneous whitespace
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Issue

• JDK-8303154: Investigate and improve instruction cache flushing during compilation (Enhancement - P2)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk17u-dev.git pull/1559/head:pull/1559
$ git checkout pull/1559

Update a local copy of the PR:
$ git checkout pull/1559
$ git pull https://git.openjdk.org/jdk17u-dev.git pull/1559/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 1559

View PR using the GUI difftool:
$ git pr show -t 1559

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk17u-dev/pull/1559.diff

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[bridgekeeper]

👋 Welcome back goetz! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[openjdk]

This backport pull request has now been updated with issue from the original commit.

[openjdk]

@GoeLin This change now passes all automated pre-integration checks.

ℹ️ This project also has non-automated pre-integration requirements. Please see the file CONTRIBUTING.md for details.

After integration, the commit message for the final commit will be:

8303154: Investigate and improve instruction cache flushing during compilation

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[mlbridge]

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[VladimirKempik]

just a note, almost not related to this PR: gha scipts in 17u-dev can't cross-compile for risc-v yet

[feilongjiang]

just a note, almost not related to this PR: gha scipts in 17u-dev can't cross-compile for risc-v yet

Hi @VladimirKempik @GoeLin, I just submit a backport PR to enable GHA cross-compiling for linux-riscv64 at #1562. Not sure if we should bump the GHA runner to 22.04 too as JDK-8293107 did?

[GoeLin]

/integrate

[openjdk]

Going to push as commit 1248b15.
Since your change was applied there have been 13 commits pushed to the master branch:

• 4eeb1c9: 8180266: Convert sun/security/provider/KeyStore/DKSTest.sh to Java Jtreg Test
• f45578e: 8225012: sanity/client/SwingSet/src/ToolTipDemoTest.java fails on Windows
• a299757: 8297476: Increase InlineSmallCode default from 1000 to 2500 for RISC-V
• d5eec58: 8283929: GHA: Add RISC-V build config
• f956352: 8305421: Work around JDK-8305420 in CDSJDITest.java
• c9194e7: 8306566: Open source several clipboard AWT tests
• afffb37: 8306076: Open source AWT misc tests
• b42886f: 8306636: Disable compiler/c2/Test6905845.java with -XX:TieredStopAtLevel=3
• cb35d88: 8299158: Improve MD5 intrinsic on AArch64
• ed698e6: 8306718: Optimize and opensource some old AWT tests
• ... and 3 more: https://git.openjdk.org/jdk17u-dev/compare/7a4708b61f4be9369d8bdccedafc871f07fc60a2...master

Your commit was automatically rebased without conflicts.

[openjdk]

@GoeLin Pushed as commit 1248b15.

💡 You may see a message that your pull request was closed with unmerged commits. This can be safely ignored.

[GoeLin]

just a note, almost not related to this PR: gha scipts in 17u-dev can't cross-compile for risc-v yet

Hi @VladimirKempik @GoeLin, I just submit a backport PR to enable GHA cross-compiling for linux-riscv64 at #1562. Not sure if we should bump the GHA runner to 22.04 too as JDK-8293107 did?

Well, this PR is not the best place to discuss this.
Updating Ubuntu means that jdk17u is no more checked against old environments. As installations often stay on old OSes, this might introduce unwanted problems.