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Type: Enhancement
Resolution: Fixed
Priority: P4
Fix Version/s: 26
Affects Version/s: 22
Component/s: hotspot
Labels:
- amazon-interest

Subcomponent:
compiler
Resolved In Build:
b19

We need functionality to relocate existing nmethods within CodeCache.
The main use case is to group hot nmethods in a separate code heap. Without this functionality, we need to use recompilation which is expensive for big methods.

Other uses cases:
- Save C1 nmethods when they are replaced by C2 nmethods having speculative code.
- Save C2 nmethods being removed as cold.

We might not need to support relocation of OSR nmethods.

blocks

JDK-8357926 Allow relocation of JVMCI nmethods

Open

causes

JDK-8370527 Memory leak after 8316694: Implement relocation of nmethod within CodeCache

Open

JDK-8369150 serviceability/jvmti/NMethodRelocation/NMethodRelocationTest.java failed with COH

Open

JDK-8369147 Various issues with new tests added by JDK-8316694

Resolved

JDK-8369642 [ubsan] nmethod::nmethod null pointer passed as argument 2 to memcpy

Resolved

JDK-8369257 PPC: compiler/whitebox/RelocateNMethodMultiplePaths.java fails with assertion

Resolved

JDK-8369148 compiler/whitebox/StressNMethodRelocation.java test timed out

Closed

JDK-8369149 compiler/whitebox/StressNMethodRelocation.java fails when running only with C1

Closed

JDK-8369151 serviceability/jvmti/NMethodRelocation/NMethodRelocationTest.java failed when run with different GC

Closed

relates to

JDK-8370571 [lworld] Complete JDK-8316694 implementation for Valhalla

Open

JDK-8326205 Grouping frequently called C2 nmethods in CodeCache

Open

JDK-8358213 Move nmethod immutable data to seperate class

Open

links to

Commit(master) openjdk/jdk/f740cd2a

Review(master) openjdk/jdk/23573

(4 causes, 3 relates to, 2 links to)

Assignee:: Chad Rakoczy

Reporter:: Evgeny Astigeevich

Votes:: 0 Vote for this issue

Watchers:: 11 Start watching this issue

Created:: 2023-09-21 13:29

Updated:: 5 days ago 02:54

Resolved:: 2025-10-04 14:20

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