8294941: GHA: Cut down cross-compilation sysroots

[shipilev]

In GHA cross-compilation, we don't need everything from the sysroot, because we use native compilers for the compilation. Therefore, we can cut them even deeper and reclaim significant amount of cache space. This would also make cache eviction less likely, which saves time on recreating the sysroots when that happens.

Current sysroots take about 300M per arch, which quickly multiplies up for multiple arches (we build 5 now), users (ballparking at about 200 active contributors). This amounts to about 1500M caches per job, and 300G in caches across our org for a single JDK tree. Update releases also use GHA for their testing, but the number of contributors there is lower. Still, I think it slides to TB territory now.

In my local tests, new aarch64 sysroot tar.gz gets reduced from 315M to just 85M, about 3.7x improvement. Even deeper cuts are possible, but they would affect the redundant .so-s in /usr/lib/${arch}/. That would be much more fragile to do and might affect our builds. Therefore, I stopped at doing just these.

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Issue

• JDK-8294941: GHA: Cut down cross-compilation sysroots

Reviewers

• Christoph Langer (@RealCLanger - Reviewer)
• Erik Joelsson (@erikj79 - Reviewer)

Reviewing

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[mlbridge]

Webrevs

• 00: Full (05775355)

[RealCLanger]

Looks good.

[openjdk]

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

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

8294941: GHA: Cut down cross-compilation sysroots

Reviewed-by: clanger, erikj

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At the time when this comment was updated there had been 17 new commits pushed to the master branch:

• 67210ab: 8286394: Address possibly lossy conversions in jdk.naming.dns
• 7a194d3: 8290154: [JVMCI] partially implement JVMCI for RISC-V
• b38bed6: 8294308: Allow dynamically choosing the MEMFLAGS of a type without ResourceObj
• 118d93b: 8294907: Remove unused NativeLookup::dll_load
• 1fda842: 8291429: java/lang/Thread/virtual/ThreadAPI.java timed out on single core system
• 2d25c0a: 8292280: Unused field 'keyListener' in BasicRadioButtonUI
• 0ad6803: 8293810: Remove granting of RuntimePermission("stopThread") from tests
• cf84c8e: 8292975: javac produces code that crashes with LambdaConversionException
• f3a44a4: 8075916: The regression-swing case failed as colored text is not shown on disabled checkbox and radio button with Nimbus LAF
• 37bd4fb: 6852577: Only for Nimbus LAF UIManager.get("PasswordField.echoChar") is null
• ... and 7 more: https://git.openjdk.org/jdk/compare/2ceebf681ffd6f9bf6967fd81b30d721bc010b94...master

As there are no conflicts, your changes will automatically be rebased on top of these commits when integrating. If you prefer to avoid this automatic rebasing, please check the documentation for the /integrate command for further details.

➡️ To integrate this PR with the above commit message to the master branch, type /integrate in a new comment.

[shipilev]

Thanks! If any build-dev folks ack this, I can integrate this today :)

[erikj79]

Seems fine to me. Nice space savings!

[shipilev]

Thanks!

/integrate

[openjdk]

Going to push as commit a1747ef.
Since your change was applied there have been 17 commits pushed to the master branch:

• 67210ab: 8286394: Address possibly lossy conversions in jdk.naming.dns
• 7a194d3: 8290154: [JVMCI] partially implement JVMCI for RISC-V
• b38bed6: 8294308: Allow dynamically choosing the MEMFLAGS of a type without ResourceObj
• 118d93b: 8294907: Remove unused NativeLookup::dll_load
• 1fda842: 8291429: java/lang/Thread/virtual/ThreadAPI.java timed out on single core system
• 2d25c0a: 8292280: Unused field 'keyListener' in BasicRadioButtonUI
• 0ad6803: 8293810: Remove granting of RuntimePermission("stopThread") from tests
• cf84c8e: 8292975: javac produces code that crashes with LambdaConversionException
• f3a44a4: 8075916: The regression-swing case failed as colored text is not shown on disabled checkbox and radio button with Nimbus LAF
• 37bd4fb: 6852577: Only for Nimbus LAF UIManager.get("PasswordField.echoChar") is null
• ... and 7 more: https://git.openjdk.org/jdk/compare/2ceebf681ffd6f9bf6967fd81b30d721bc010b94...master

Your commit was automatically rebased without conflicts.

[openjdk]

@shipilev Pushed as commit a1747ef.

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