OpenResty XRay による Core Dump の自動分析技術
- core dump ファイルの確認
- core dump ファイルを分析
- 全自動分析とレポート作成
- core dump ファイルの確認
- core dump ファイルを分析
- 全自動分析とレポート作成
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dynamic-tracing
C++ による C++ アプリケーションの動的トレース技術
- 対象 C++ プログラムを設定
- C++（または Y++）アナライザーの作成
- 対象プログラムとアナライザーの実行
- 複雑な C++ アプリケーションのサポート強化
- デバッグシンボルについて
- 結論
- 対象 C++ プログラムを設定
- C++（または Y++）アナライザーの作成
- 対象プログラムとアナライザーの実行
- 複雑な C++ アプリケーションのサポート強化
- デバッグシンボルについて
- 結論
OpenResty XRay を使用して Linux カーネルのトレースサブシステムにおける 2 つのバグを捕捉
- ユーザー空間メモリ読み取り時のカーネルデッドロック
- カーネル内の x86 ブレークポイント挿入におけるデータ競合
- ユーザー空間メモリ読み取り時のカーネルデッドロック
- カーネル内の x86 ブレークポイント挿入におけるデータ競合
The Wonderland of Dynamic Tracing (Part 1 of 3)
- Dynamic Tracing
- What It Is
- Too Good to be True?
- How it Works
- Still Having Doubts?
- The Advantages of Dynamic Tracing
- DTrace
- SystemTap
- DTrace and SystemTap
- Applications of SystemTap in Production
- Dynamic Tracing
- What It Is
- Too Good to be True?
- How it Works
- Still Having Doubts?
- The Advantages of Dynamic Tracing
- DTrace
- SystemTap
- DTrace and SystemTap
- Applications of SystemTap in Production
The Wonderland of Dynamic Tracing (Part 2 of 3)
- Flame Graphs
- Methodology
- Knowledge Is Power
- Open-Source and Debug Symbols
- Flame Graphs
- Methodology
- Knowledge Is Power
- Open-Source and Debug Symbols
The Wonderland of Dynamic Tracing (Part 3 of 3)
- Dynamic Tracing Support in Linux Kernels
- Hardware Tracing
- Analyze Remains of Dead Process
- Traditional Debugging Technologies
- A Messy World of Debugging
- OpenResty XRay
- Dynamic Tracing Support in Linux Kernels
- Hardware Tracing
- Analyze Remains of Dead Process
- Traditional Debugging Technologies
- A Messy World of Debugging
- OpenResty XRay
Resolving Bilibili’s major site incident with OpenResty XRay
- The incident
- Process of resolution
- Hardening after the incident
- OpenResty XRay Services
- The incident
- Process of resolution
- Hardening after the incident
- OpenResty XRay Services
Tracing the Slowest PCRE Regular Expressions in OpenResty or Nginx Processes
- System Environment
- Narrowing Down the Culprit without Guessing
- Limiting the execution overhead of PCRE
- Non-Backtracking Regular Expression Engines
- Lua’s Builtin Patterns
- Tracing Applications inside Containers
- How The Tools are Implemented
- The Overhead of the Tools
- System Environment
- Narrowing Down the Culprit without Guessing
- Limiting the execution overhead of PCRE
- Non-Backtracking Regular Expression Engines
- Lua’s Builtin Patterns
- Tracing Applications inside Containers
- How The Tools are Implemented
- The Overhead of the Tools
Listing Loaded Lua Modules in OpenResty or Nginx Processes
- System Environment
- Names of Loaded Lua Modules
- Running Directly in the Web Console
- Tracing Applications inside Containers
- How The Tools are Implemented
- The Overhead of the Tools
- System Environment
- Names of Loaded Lua Modules
- Running Directly in the Web Console
- Tracing Applications inside Containers
- How The Tools are Implemented
- The Overhead of the Tools
Ylang: Universal Language for eBPF, Stap+, GDB, and More (Part 4 of 4)
- Transparent Container Tracing
- Efficient Stack Unwinding
- Analyzing Dead Processes (Core Dumps)
- Very Low Tracing Overhead
- Standard Ylang Libraries & Tools
- Network Filtering & Control
- The Ylang Compiler’s Implementation
- Operating System Support
- Contributions to Open-Source Communities
- Transparent Container Tracing
- Efficient Stack Unwinding
- Analyzing Dead Processes (Core Dumps)
- Very Low Tracing Overhead
- Standard Ylang Libraries & Tools
- Network Filtering & Control
- The Ylang Compiler’s Implementation
- Operating System Support
- Contributions to Open-Source Communities
Ylang: Universal Language for eBPF, Stap+, GDB, and More (Part 3 of 4)
- The Language Syntax (Continued)
- String Literals
- Built-in Regex Support
- Full Control-Flow Support
- Floating-Point Number Support
- Compared to Open-Source Toolchains
- Transparent Debug Symbol Handling
- Debug Symbols: No Runtime Overhead
- Centralized Package Database
- Fuzzy Matching Debug Symbols
- The Language Syntax (Continued)
- String Literals
- Built-in Regex Support
- Full Control-Flow Support
- Floating-Point Number Support
- Compared to Open-Source Toolchains
- Transparent Debug Symbol Handling
- Debug Symbols: No Runtime Overhead
- Centralized Package Database
- Fuzzy Matching Debug Symbols
Ylang: Universal Language for eBPF, Stap+, GDB, and More (Part 2 of 4)
- The Language Syntax (Continued)
- Macros with Extensions
- Tracer and Tracee Spaces
- Probes
- Extended Variable Types
- The Language Syntax (Continued)
- Macros with Extensions
- Tracer and Tracee Spaces
- Probes
- Extended Variable Types
Ylang: Universal Language for eBPF, Stap+, GDB, and More (Part 1 of 4)
- What is Dynamic Tracing
- Why the “Y” Name
- Getting Started
- Various Backends and Runtimes
- Why a Unified Frontend Language
- The Language Syntax
- What is Dynamic Tracing
- Why the “Y” Name
- Getting Started
- Various Backends and Runtimes
- Why a Unified Frontend Language
- The Language Syntax
Introduction to Lua-Land CPU Flame Graphs
- What is a Flame Graph
- Simple Lua samples
- Complicated Lua applications
- Sampling overhead
- Safety
- Compatibility
- Other types of Lua-land Flame Graphs
- What is a Flame Graph
- Simple Lua samples
- Complicated Lua applications
- Sampling overhead
- Safety
- Compatibility
- Other types of Lua-land Flame Graphs
Memory Fragmentation in OpenResty and Nginx's Shared Memory Zones
- An empty zone
- Filling entries of similar sizes
- Deleting odd-numbered keys
- Deleting the keys in the first half
- Mitigating Fragmentation
- An empty zone
- Filling entries of similar sizes
- Deleting odd-numbered keys
- Deleting the keys in the first half
- Mitigating Fragmentation
How OpenResty and Nginx Shared Memory Zones Consume RAM
- Slabs and pages
- What is allocated is not what is paid for
- Fake Memory Leaks
- HUP reload
- Slabs and pages
- What is allocated is not what is paid for
- Fake Memory Leaks
- HUP reload
How OpenResty and Nginx Allocate and Manage Memory
- On The System Level
- On The Application Level
- For Traditional Nginx Servers
- On The System Level
- On The Application Level
- For Traditional Nginx Servers
