Add ETW instrumentation to allow profilers to map JITed code to function names
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描述
Feature or enhancement
Proposal:
For Linux and macOS, currently cpython has perf maps/jitdump support (macOS support is added in #136461)
In here, Jeff mentioned that Windows support is possible through ETW JSCRIPT9::MethodLoad events instead of jitdump: https://github.com/python/cpython/pull/136461#issuecomment-3104217608
This will allow samply and also Windows Performance Analyzer to read and inject these JITed function names.
Firefox and Chrome both emit these events for jitted JS code:
https://bugzilla.mozilla.org/show_bug.cgi?id=1765402
https://bugs.chromium.org/p/v8/issues/detail?id=11043
For more specifically, code for this is here:
https://searchfox.org/mozilla-central/rev/387160feb07b75ae76bfc12df035a10f58d25168/js/src/jit/PerfSpewer.cpp#643
https://chromium.googlesource.com/v8/v8/+/88926769783fecb3bd3b08a7a0cb702b037d9f85/src/diagnostics/system-jit-win.cc
Some more links that were mentioned in other bugs:
https://github.com/Zhentar/UnityEtwSymbols/blob/e3614341a9553b2c916c9ebb12ace4a0eb46291b/etwSymbols.c
https://github.com/chakra-core/ChakraCore/blob/1eae003b7a981b4b691928daef27b5254a49f5eb/lib/Runtime/Language/AsmJsEncoder.cpp#L246
Note: ETW stands for Event Tracing for Windows
cc @pablogsal
Has this already been discussed elsewhere?
No response given
Links to previous discussion of this feature:
#136461.
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研究方向
先閱讀 issue 中連結的 perf maps 和 jitdump 文件,然後閱讀 #136461 中的討論,並比較其中參照的 Firefox、Chromium、UnityEtwSymbols 和 ChakraCore 實作。當 Windows ETW 事件公開 JITed Python 函式的名稱和位址,讓 samply 和 Windows Performance Analyzer 能夠進行對應時,即視為完成。
由索引模型根據 Issue 內容生成。
評估
- 技術堆疊
- python
- 領域
- performance
- Issue 類型
- 功能
- 難度
- 5/5
- 預估耗時
- 一週以上
- 活躍度
- 停滯
- 描述清晰度
- 基本清楚
- 新手友好度
- 25/100