8365512: Replace -Xcomp with -Xmixed for AOT assembly phase

[vnkozlov]

When debugging AOT code generation in Leyden repo I noticed that AOT JIT compilations are serial with -Xcomp even so we create a lot of compiler threads to speed up. It is because -Xcomp enforce blocking compilation and only one thread submits AOT compilations. Also -Xcomp triggers a lot more other, not AOT, compilations which we don't need during assembly phase.

I suggest to replace -Xcomp with -Xmixed for AOT assembly phase.

I want to push it into mainline first because in mainline we don't even do AOT compilation yet.

This should speed up AOT testing with -Xcomp.

Tested tier1-6,8,10 (-rt)

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Issue

• JDK-8365512: Replace -Xcomp with -Xmixed for AOT assembly phase (Enhancement - P4)

Reviewers

• Aleksey Shipilev (@shipilev - Reviewer)

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[bridgekeeper]

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[openjdk]

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

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

8365512: Replace -Xcomp with -Xmixed for AOT assembly phase

Reviewed-by: shade

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At the time when this comment was updated there had been 10 new commits pushed to the master branch:

• 4152099: 8365098: make/RunTests.gmk generates a wrong path to test artifacts on Alpine
• 98f54d9: 8365487: [asan] some oops (mode) related tests fail
• 7698c37: 8364556: JFR: Disable SymbolTableStatistics and StringTableStatistics in default.jfc
• ... and 7 more: https://git.openjdk.org/jdk/compare/4680dc983169d48fcf83eb50dc60e32e79d5d976...master

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[mlbridge]

Webrevs

• 01: Full - Incremental (60861d3a)
• 00: Full (08bd075f)

[shipilev]

This looks reasonable. I think the comment needs to be more explicit what and why we are doing this thing.

[shipilev]

Looks good!

[vnkozlov]

Thank you @shipilev

[vnkozlov]

/integrate

[openjdk]

Going to push as commit a65f200.
Since your change was applied there have been 17 commits pushed to the master branch:

• 8c363b3: 8364319: Move java.lang.constant.AsTypeMethodHandleDesc to jdk.internal
• c5cbcac: 8361730: The CodeBuilder.trying(BlockCodeBuilder,CatchBuilder) method generates corrupted bytecode in certain cases
• dccca0f: 8365572: Shenandoah: Remove unused thread local _paced_time field
• ... and 14 more: https://git.openjdk.org/jdk/compare/4680dc983169d48fcf83eb50dc60e32e79d5d976...master

Your commit was automatically rebased without conflicts.

[openjdk]

@vnkozlov Pushed as commit a65f200.

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