RFR: 8305895: Implement JEP 450: Compact Object Headers (Experimental) [v13]

[Roberto Castañeda Lozano]

On Thu, 12 Sep 2024 11:46:35 GMT, Roberto Castañeda Lozano <rcastanedalo at openjdk.org> wrote:

>> Roman Kennke has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Revert accidental change of UCOH default
>
> src/hotspot/share/cds/filemap.cpp line 2457:
> 
>> 2455:                           compressed_oops(), compressed_class_pointers());
>> 2456:   if (compressed_oops() != UseCompressedOops || compressed_class_pointers() != UseCompressedClassPointers) {
>> 2457:     log_info(cds)("Unable to use shared archive.\nThe saved state of UseCompressedOops and UseCompressedClassPointers is "
> 
> The promotion of this CDS log line from `info` to `warning` triggers false failures in the `test/hotspot/jtreg/compiler/intrinsics/bmi` tests when running them with `-XX:-UseCompressedClassPointers`. These tests expect the standard output of different JVM runs to be identical, but the timestamps in the log messages tend to differ. I suggest adjusting the test configuration so that log timestamps are simply omitted, as in [this patch](https://github.com/robcasloz/jdk/commit/48f6e90ef6e0a71b55df536ed04a8b72130b5ea9) (feel free to merge it as-is or with any further changes you may find necessary).

This comment has been marked as "resolved" without any apparent action being taken, is that intentional?

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PR Review Comment: https://git.openjdk.org/jdk/pull/20677#discussion_r1758369787