Research areas: Windows & Linux platforms, C/C++ backend development, embedded systems and Linux kernel, etc.
This article explains the core principles of memory alignment on Linux, shows how misaligned data harms CPU cache and execution speed, provides concrete C code examples and benchmark results, and offers practical techniques—including compiler directives and struct layout tricks—to achieve optimal performance.
This article explains how subtle misconfigurations in the Linux kernel network protocol stack can cause high latency, walks through the stack’s layered architecture, details TCP/UDP mechanisms, and provides practical troubleshooting steps with tools like ethtool, ss, tcpdump, Wireshark, and bpftrace.
mmap, the classic Linux memory‑mapping technique, often surpasses the modern async io_uring in various I/O scenarios by eliminating redundant data copies, reducing system calls, and enabling zero‑copy access, while the article explains its fundamentals, workflow, performance comparisons, practical usage, pitfalls, and code examples.
This comprehensive guide explains why traditional I/O models become bottlenecks in high‑performance computing, introduces the modern io_uring framework with its submission and completion queues, walks through its design goals, core concepts, workflow, performance comparisons, optimization tips, real‑world use cases, and provides complete C examples for practical adoption.
This guide explains what kdump is, how it works, and provides step‑by‑step instructions for installing, configuring, and verifying kdump on Linux systems, plus tips for analyzing vmcore files with crash and GDB.
This comprehensive guide walks readers through the fundamentals of Linux shell scripting, covering essential commands, variables, control structures, functions, and practical automation scripts for monitoring, log analysis, and backups, while also addressing performance and security best practices.
This article explains the design, implementation, and practical use of the Linux kernel's intrusive linked‑list data structure, covering its core concepts, list_head definition, common macros, insertion, deletion, traversal, optimization techniques, concurrency control with RCU and memory barriers, and real‑world examples in device drivers and process scheduling.
This article explains how to use Linux's built‑in cgroups and taskset tools to monitor, limit, and bind process workloads, providing detailed commands, subsystem explanations, collaborative usage strategies, real‑world case studies, and troubleshooting tips for improving system performance and stability.
This article explains the purpose of dev_info, dev_dbg, and dev_err in Linux kernel logging, shows how to view their output, and provides step‑by‑step methods—including dynamic debug, kernel configuration, and module parameters—to enable or disable dev_dbg at runtime without recompiling or rebooting.
This article explains how Linux memory watermarks, kswapd, direct reclaim, and the OOM Killer interact, provides detailed code examples, shows real‑world case studies, and offers practical tuning steps—including kernel parameters, cgroup limits, and monitoring tools—to prevent system stalls and crashes.
