RFR: 8352251: Implement Cooperative JFR Sampling [v16]

Markus Grönlund mgronlun at openjdk.org
Mon May 5 08:50:35 UTC 2025


> Greetings,
> 
> This is the implementation of JEP [JDK-8350338 Cooperative JFR Sampling](https://bugs.openjdk.org/browse/JDK-8350338).
> 
> Implementations in this change set are provided and have been tested on the following platforms:
> 
> - windows-x64
> - windows-x64-debug
> - linux-x64
> - linux-x64-debug
> - macosx-x64
> - macosx-x64-debug
> - linux-aarch64
> - linux-aarch64-debug
> - macosx-aarch64
> - macosx-aarch64-debug
> 
> Testing: tier1-6, jdk_jfr, stress testing.
> 
> Platform porters note:
> Some platform-specific code needs to be provided, mainly in the interpreter. Take a look at the following files for changes:
> 
> - src/hotspot/cpu/x86/frame_x86.cpp
> - src/hotspot/cpu/x86/interp_masm_x86.cpp
> - src/hotspot/cpu/x86/interp_masm_x86.hpp
> - src/hotspot/cpu/x86/javaFrameAnchor_x86.hpp
> - src/hotspot/cpu/x86/macroAssembler_x86.cpp
> - src/hotspot/cpu/x86/macroAssembler_x86.hpp
> - src/hotspot/cpu/x86/templateInterpreterGenerator_x86.cpp
> - src/hotspot/cpu/x86/templateTable_x86.cpp
> - src/hotspot/os_cpu/linux_x86/javaThread_linux_x86.hpp
> 
> Thanks
> Markus

Markus Grönlund has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 19 commits:

 - Merge branch 'master' into 8352251
 - Configuration and test for jdk.SafepointLatency event
 - include guards
 - push back pd constants into pd code
 - Attempt to build Windows-AARCH64
 - No invariants for sender_for_interpreter_frame
 - zero
 - Merge branch 'master' into 8352251
 - Refine SamplingLatency event description
 - Update default.jfc
 - ... and 9 more: https://git.openjdk.org/jdk/compare/8511220f...e448090e

-------------

Changes: https://git.openjdk.org/jdk/pull/24296/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24296&range=15
  Stats: 3381 lines in 82 files changed: 2071 ins; 960 del; 350 mod
  Patch: https://git.openjdk.org/jdk/pull/24296.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24296/head:pull/24296

PR: https://git.openjdk.org/jdk/pull/24296


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