JDK-8254723 : Add diagnostic command to write Linux perf map file
- Type: Enhancement
- Component: hotspot
- Sub-Component: svc
- Priority: P5
- Status: Resolved
- Resolution: Fixed
- OS: linux
- Submitted: 2020-10-14
- Updated: 2024-02-29
- Resolved: 2020-11-03
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| JDK 16 |
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16 b23Fixed  |
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Description
When using the Linux "perf" tool to do system profiling, symbol names of running Java methods cannot be decoded, resulting in unhelpful output such as: 10.52% [JIT] tid 236748 [.] 0x00007f6fdb75d223 Perf can read a simple text file format describing the mapping between address ranges and symbol names for a particular process: https://github.com/torvalds/linux/blob/master/tools/perf/Documentation/jit-interface.txt It's possible to generate this already for Java processes using a JVMTI plugin, e.g. with https://github.com/jvm-profiling-tools/perf-map-agent . However this requires compiling third-party code and then loading the agent into your Java process. It would be more convenient if Hotspot could write this file directly using a diagnostic command. The information required is almost identical to that of the existing Compiler.codelist command.
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