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Type: Enhancement
Resolution: Fixed
Priority: P4
Fix Version/s: 19
Affects Version/s: 19
Component/s: hotspot
Labels:
- c2

Subcomponent:
compiler
Resolved In Build:
b10

I am following up on the performance issue where the culprit seems to be the too low OptoLoopAlignment. To perform better experiments, I suggest allowing larger alignments.

Note that we cannot make OptoLoopAlignment larger than CodeEntryAlignment, because nmethod copy would break it, see assert in `MacroAssembler::align`. See ~~JDK-8273459~~ for latest discussion about it. So CodeEntryAlignment needs to be configurable as well.

No default value is changed, this only unblocks experiments.

relates to

JDK-8281829 runtime/CommandLine/OptionsValidation/TestOptionsWithRanges.java fails after JDK-8281467

Resolved

JDK-8281936 compiler/arguments/TestCodeEntryAlignment.java fails on AVX512 machines

Closed

JDK-8281586 x86: Default to larger OptoLoopAlignment

Open

JDK-8282355 compiler/arguments/TestCodeEntryAlignment.java failed "guarantee(sect->end() <= tend) failed: sanity"

Closed

JDK-8273459 Update code segment alignment to 64 bytes

Resolved

links to

Commit openjdk/jdk/b1564624

Review openjdk/jdk/7388

(2 links to)

Assignee:: Aleksey Shipilev

Reporter:: Aleksey Shipilev

Votes:: 0 Vote for this issue

Watchers:: 3 Start watching this issue

Created:: 2022-02-08 09:34

Updated:: 2022-02-24 14:23

Resolved:: 2022-02-14 22:21

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