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This document includes: - PCIe basic concepts and bandwidth comparison - PCIe topology structure (Root Complex, Switch, Endpoint) - Configuration space layout and BAR registers - Transaction Layer Protocol (TLP) types - Linux kernel PCI subsystem architecture - Device enumeration flow with code analysis - Driver loading and probe sequence - Key data structures (pci_dev, pci_driver, pci_bus) - Practical examples and debugging tips Suitable for technical sharing and knowledge transfer. Co-authored-by: 15605196882 <15605196882@163.com>
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Detailed documentation of schedutil cpufreq governor including: - Overall architecture and component relationships - Trigger points from CFS/RT/DL/SCX schedulers - Core processing flow with function call chains - Fast path vs slow path frequency update mechanisms - Key function interfaces at each layer - Data structures (sugov_policy, sugov_cpu, sugov_tunables) - Frequency calculation formulas and IO wait boost - Sequence diagrams for both fast and slow paths - Debugging and tracing techniques Based on Linux 6.19-rc7 kernel source code. Co-authored-by: 15605196882 <15605196882@163.com>
Added comprehensive section on CPPC (Collaborative Processor Performance Control): - CPPC uses the same schedutil framework as other drivers - Fast switch condition depends on DESIRED_PERF register location - System Memory/IO enables fast path, PCC requires slow path - Detailed cppc_cpufreq_fast_switch() and cppc_set_perf() flow - Complete call chains for both fast and slow paths with CPPC - Comparison table: CPPC vs Intel P-State vs ACPI CPUFreq - CPPC-specific debugging commands This clarifies that CPPC frequency scaling follows the same schedutil governor flow, with driver-layer differences. Co-authored-by: 15605196882 <15605196882@163.com>
Detailed documentation covering: - NOHZ_FULL (Full Dynticks/Adaptive Ticks) concepts and mechanisms - Linux tick mechanism evolution (HZ_PERIODIC → NO_HZ_IDLE → NO_HZ_FULL) - Working principles with state transition diagrams - Kernel configuration options and boot parameters - Housekeeping CPU mechanism and isolation types - Tick dependency management API - RCU callback offloading (rcu_nocbs) - OS jitter sources and mitigation strategies - Application scenarios: - Real-time systems - High Performance Computing (HPC) - Low-latency trading systems - Virtualization/cloud computing - Best practice configurations with example scripts - Debugging and verification techniques - Known limitations and caveats Based on kernel source analysis of tick-sched.c, isolation.c, and official kernel documentation. Co-authored-by: 15605196882 <15605196882@163.com>
- 新增 1.5 节：PCIe 发展历程 - 前 PCIe 时代（PCI 1.0 ~ PCI-X 2.0） - PCIe 各代际发展（1.0 ~ 7.0），包含技术要点、带宽参数、关键里程碑 - 带宽演进时间线图 - PCI-SIG 标准管理组织介绍 - 新增第 11 节：pci-utils 基本用法 - 安装方式（多发行版） - lspci 详细用法及常用选项组合 - setpci 读写配置空间寄存器用法 - update-pciids 更新 PCI ID 数据库 - 实用调试场景（链路降速排查、MSI-X 检查、未知设备识别、Bug 报告导出） - libpci 编程接口示例 - 更新目录和参考资料 - 文档版本更新为 1.1 Co-authored-by: Slim6882 <jackYoung0915@users.noreply.github.com>
- 为所有 11 个主章节补充二级子节目录 - 保持缩进对齐：1-9 章用 3 空格缩进，10-11 章用 4 空格缩进 - 所有子节标题均带有锚点链接，方便页内跳转 Co-authored-by: Slim6882 <jackYoung0915@users.noreply.github.com>
Pcie发展与pci-utils
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PCIe_Knowledge_Summary.mdto document PCIe essentials and Linux kernel device loading for a presentation.