RFR: 8342818: Implement JEP 509: JFR CPU-Time Profiling [v31]
Johannes Bechberger
jbechberger at openjdk.org
Tue Jun 3 07:12:46 UTC 2025
> This is the code for the [JEP 509: CPU Time based profiling for JFR](https://openjdk.org/jeps/509).
>
> Currently tested using [this test suite](https://github.com/parttimenerd/basic-profiler-tests). This runs profiles the [Renaissance](https://renaissance.dev/) benchmark with
> - ... different heap sizes
> - ... different GCs
> - ... different samplers (the standard JFR and the new CPU Time Sampler and both)
> - ... different JFR recording durations
> - ... different chunk-sizes
Johannes Bechberger has updated the pull request incrementally with three additional commits since the last revision:
- Update src/hotspot/share/jfr/periodic/sampling/jfrCPUTimeThreadSampler.cpp
Co-authored-by: Aleksey Shipilëv <shipilev at amazon.de>
- Update src/hotspot/share/jfr/periodic/sampling/jfrCPUTimeThreadSampler.cpp
Co-authored-by: Aleksey Shipilëv <shipilev at amazon.de>
- Small fixes
-------------
Changes:
- all: https://git.openjdk.org/jdk/pull/25302/files
- new: https://git.openjdk.org/jdk/pull/25302/files/bef52132..c3dedefb
Webrevs:
- full: https://webrevs.openjdk.org/?repo=jdk&pr=25302&range=30
- incr: https://webrevs.openjdk.org/?repo=jdk&pr=25302&range=29-30
Stats: 17 lines in 4 files changed: 2 ins; 5 del; 10 mod
Patch: https://git.openjdk.org/jdk/pull/25302.diff
Fetch: git fetch https://git.openjdk.org/jdk.git pull/25302/head:pull/25302
PR: https://git.openjdk.org/jdk/pull/25302
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