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Add fjmethodid=lazy: profile HotSpot without jmethodIDs - #868

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rkennke wants to merge 26 commits into

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investigate/lazy-jmethodid-vm-resolution

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Add fjmethodid=lazy: profile HotSpot without jmethodIDs#868
rkennke wants to merge 26 commits into
mainfrom
investigate/lazy-jmethodid-vm-resolution

Commits on Oct 20, 2026
- Add fjmethodid=lazy: resolve raw Method* frames via a class liveness registry
  
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  b952432
- Tag raw Method* frames with a KlassRegistry epoch to reject reused Klass* addresses
  
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  7c89a1a
- Locate Klass::_trace_id by probing array klasses
  
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  917a860
- Tag raw Method* frames with the holder's JFR trace ID when calibrated
  
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  ee02b48
- Mark each raw frame's tag kind and validate the trace-ID offset against JFR in CI
  
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  7639625
- Harden lazy resolution against metadata reuse and redefinition
  
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  d56eb54
- Validate the trace-ID offset against jdk.ClassDefine instead of execution samples
  
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  ffd8a82
- Cache raw frame resolutions per dump
  
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  368abe6
- Let JVMTI validate redefinition arguments before the hooks inspect them
  
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  4b2a5df
- Stress-test lazy resolution against live class redefinition
  
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  5c36b52
- Drop registry-epoch tags; lazy mode requires JFR trace IDs
  
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  16b4528
- Catch a malformed trace ID in LazyTraceIdJfrValidationTest's log parser
  
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  ad7f3c7
- Add working plan for combining #864 and #867
  
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  0941484
- Resolve raw frames from VM metadata instead of allocating jmethodIDs
  
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  61ea24c
- Update the combined plan: PR structure, phase 1 status, Linux hand-over
  
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  73545b6
- Run LazyRedefinitionStressTest on JDK 8
  
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  fa6e033
- Count lazy frames whose Method* can no longer be read
  
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  3345c67
- Retry trace-ID calibration on fresh array dimensions
  
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  e47ef4b
- Fail on unparsable child-JVM output instead of skipping
  
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  cfaa923
- Name hidden classes as JVMTI does when resolving raw frames
  
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  efbea15
- Remove the working plan document
  
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  cf1186d
- Report KlassRegistry's table size and purges as counters
  
  rkennke
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  72781e2
- Pin classes per dump instead of registering every class
  
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  1d01b40
- Harden per-dump pinning
  
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  ca1782b
- Recheck untracked redefinitions after reading a raw frame's metadata
  
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  3399d34
- Clear the OutOfMemoryError of a failed redefinition-mark allocation
  
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  c903a50

Commits

Commits on Oct 20, 2026