8293020: jmod should not be treated as "small" tool for large modules

[shipilev]

This is similar to JDK-8245168, but the blanket change to allow all modules be compiled with default options is a net loss. Instead, we can hand-pick the major offenders (large modules) where running jmod with normal tool options improves performance.

I instrumented the jmod to tell me the times it needs to create individual modules, and hand-picked three top modules that take multiple seconds to run.

Motivational make clean-images images times:

# x86_64 Server, release

# Baseline
real	0m12.040s
user	1m4.872s
sys	0m10.805s

# Patched
real	0m10.785s  ; <--- 1.2s faster
user	1m7.031s
sys	0m10.985s

# x86_64 Server, fastdebug

# Baseline
real	0m19.263s
user	2m42.317s
sys	0m18.537s

# Patched
real	0m17.911s ;  <--- 1.1s faster
user	2m52.810s
sys	0m19.092s


# x86_64 Server, slowdebug

# Baseline
real	0m44.799s
user	10m7.106s
sys	0m17.578s

# Patched
real	0m46.975s   ; <--- 2.5 sec slower
user	11m1.155s
sys	0m17.060s

I think we can accept the slowdebug regression in favor of improvements on release and fastdebug that most people seem to be building every day.

---

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Issue

• JDK-8293020: jmod should not be treated as "small" tool for large modules

Reviewers

• Erik Joelsson (@erikj79 - Reviewer)
• Magnus Ihse Bursie (@magicus - Reviewer)
• Alan Bateman (@AlanBateman - Reviewer)

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• 02: Full - Incremental (3f60c7f2)
• 01: Full - Incremental (50ae27e7)
• 00: Full (3be7680d)

[openjdk]

@shipilev 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:

8293020: jmod should not be treated as "small" tool for large modules

Reviewed-by: erikj, ihse, alanb

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At the time when this comment was updated there had been 23 new commits pushed to the master branch:

• 6e24827: 8292878: x86: Make scratch register usage explicit in assembler code
• f5ebbf3: 8292657: Calling GetLocalXXX from virtual thread with thread parameter set to NULL returns carrier locals
• 550e5d7: 4958071: (spec) confusing exception list for javax.crypto.Cipher.init(...) for
• d3d2e66: 8293009: Remove unused field 'millisPerHour' in DateFormatSymbols
• f3ebb42: 8293036: x86_64: Move Continuation-related stub methods to MacroAssembler
• 1576f99: 8288759: GCC 12 fails to compile signature.cpp due to -Wstringop-overread
• f285cea: 8293037: Remove DebuggerBase.writeBytes() and related code from SA
• 343333a: 8293004: (fs) FileChannel.transferXXX use of copy_file_range needs fallback handling for ENOSYS
• b3450e9: 8292850: Unused field 'expiredTimersKey' in javax.swing.TimerQueue
• 6b7d4b1: 8293028: Remove GenCollectedHeap::handle_failed_promotion
• ... and 13 more: https://git.openjdk.org/jdk/compare/a476ec5c81968e9a8cf7fb02f61cc4a5c8c2d520...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]

/label core-libs

[openjdk]

@shipilev
The core-libs label was successfully added.

[shipilev]

If anyone from core-libs crowd wants to chime in, welcome. Otherwise, I'll integrate soon.

[shipilev]

/integrate

[openjdk]

Going to push as commit d2eed07.
Since your change was applied there have been 31 commits pushed to the master branch:

• 923c952: 8293098: GHA: Harmonize GCC version handling for host and cross builds
• 38377d5: 8291649: multiple tests failing with -Xcomp after JDK-8290034
• 2d7792c: 8293065: Zero build failure on AArch64 and RISCV64 after JDK-8293007
• c3380c0: 8292995: improve the SA page cache
• 1cf245d: 8292590: Product JVM crashes with FLAG_SET_XXX on non-product Flag
• 6335150: 6205692: (spec) javax.crypto.MacSpi.engineUpdate(ByteBuffer input): NPE should be specified
• 622be79: 8293090: Remove unused par_oop_since_save_marks_iterate_done
• 3d0ab2b: 8292858: G1: Remove redundant check in G1FlushHumongousCandidateRemSets
• 6e24827: 8292878: x86: Make scratch register usage explicit in assembler code
• f5ebbf3: 8292657: Calling GetLocalXXX from virtual thread with thread parameter set to NULL returns carrier locals
• ... and 21 more: https://git.openjdk.org/jdk/compare/a476ec5c81968e9a8cf7fb02f61cc4a5c8c2d520...master

Your commit was automatically rebased without conflicts.

[openjdk]

@shipilev Pushed as commit d2eed07.

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