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对Java 的 -XX:+PreserveFramePointer 选项作说明 #740

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sharang merged 1 commit into from
Sep 23, 2025
Merged

对Java 的 -XX:+PreserveFramePointer 选项作说明 #740

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1 change: 1 addition & 0 deletions docs/zh/05-features/04-continuous-profiling/01-auto-profiling.md
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Expand Up @@ -65,6 +65,7 @@ permalink: /features/continuous-profiling/auto-profiling
- 编译 Rust：`RUSTFLAGS="-C force-frame-pointers=yes"`
- 编译 Golang：默认开启，无需额外编译参数
- 运行 Java：`-XX:+PreserveFramePointer`
- 开启此参数会禁用某些编译器优化，不过根据 [Netflix](https://netflixtechblog.com/java-in-flames-e763b3d32166) 和 [Brendan Gregg](https://www.brendangregg.com/FlameGraphs/cpuflamegraphs.html) 的实测结果，该配置通常只会引入 <1% 的性能损耗。因此，Netflix 早在 2015 年开始已经在生产环境大规模使用，以支撑其 Java 程序的每日性能分析。
- 启用 Agent 的 DWARF 栈回溯能力请参考[文档](../../configuration/agent/#inputs.ebpf.profile.unwinding)
- 对于编译型语言的应用进程，编译时需要注意保留符号表

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5 changes: 3 additions & 2 deletions translate/translated/05-features/04-continuous-profiling/01-auto-profiling.md
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Expand Up @@ -66,7 +66,8 @@ Two prerequisites must be met to obtain profiling data:
- Compile C/C++: `gcc -fno-omit-frame-pointer`
- Compile Rust: `RUSTFLAGS="-C force-frame-pointers=yes"`
- Compile Golang: Enabled by default, no extra compile parameters needed
- Run Java: `-XX:+PreserveFramePointer`
- Run Java: `-XX:+PreserveFramePointer`
- Enabling this parameter disables certain compiler optimizations. However, based on real-world measurements from [Netflix](https://netflixtechblog.com/java-in-flames-e763b3d32166) and [Brendan Gregg](https://www.brendangregg.com/FlameGraphs/cpuflamegraphs.html), this configuration typically introduces less than 1% performance overhead. As a result, Netflix has been widely using it in production since 2015 to support daily performance analysis of its Java applications.
- For enabling the Agent's DWARF stack unwinding capability, please refer to the [documentation](../../configuration/agent/#inputs.ebpf.profile.unwinding)
- For compiled languages, ensure the symbol table is preserved during compilation

Expand All @@ -89,4 +90,4 @@ The Off-CPU profiling feature **only** collects the following call stacks:
- Check whether the file contains a symbol table
```
readelf -WS $path | grep symtab
```
```
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