Linux Kernel Journey
This article explains how to measure, analyze, and improve CPU usage in software by examining key metrics, choosing efficient algorithms and data structures, leveraging compiler options, exploiting cache behavior and SIMD vectorization, and applying practical case studies with Linux profiling tools.
This 148‑page PowerPoint offers a thorough, still‑relevant overview of virtualization, detailing its core concepts, hardware mechanisms, software implementations, XEN and KVM architectures, peripheral virtualization, and the relationship to containers and Docker.
DeepSeek engineers highlighted Tencent’s open‑source TRMT and DeepEP contributions that boost GPU‑to‑GPU communication by up to 300%, double RoCE performance and add a further 30% gain on InfiniBand, while addressing lane‑utilization and CPU‑control bottlenecks through three targeted optimizations.
The article explains how the Linux kernel decides the CPU for a newly woken task, detailing the roles of wake_affine and select_idle_sibling, the influence of cache topology, run‑queue load, and various idle‑checking heuristics, with concrete examples and code snippets.
The article recaps the 3rd eBPF Developer Conference in Xi'an, highlighting talks on BPF‑on‑MPTCP, system‑wide PGO, bperf, autonomous‑driving use cases, and AI‑driven observability, while sharing the author's insights on continuous profiling, SysOM, and future challenges of scaling eBPF with large models.
The 3rd eBPF Developer Conference held on April 19, 2025 at Xi'an University of Posts and Telecommunications featured 36 expert talks on eBPF advancements, network and security innovations, observability, performance optimization, a vibrant project marketplace, student projects, and provides video and PPT resources for the community.
This article walks through the theory of Linux file systems, compares flash‑specific filesystems, outlines the essential rootfs directories, details required tools like a cross‑compiler and TFTP/NFS servers, and provides a complete step‑by‑step procedure—including BusyBox compilation, rootfs population, init scripts, and ramdisk creation—to produce a bootable root filesystem for an embedded board.
The article explains how Alibaba Cloud's SysOM console uses low‑overhead process hotspot tracing, stack unwinding, symbol resolution, eBPF and AI diagnostics to pinpoint CPU, memory, lock and network issues, offering visual flame‑graph analysis and real‑world case studies for faster root‑cause identification.
The article explains how Linux triggers a page fault when a process accesses a virtual memory page that is not resident in physical RAM, describes the underlying virtual memory and MMU concepts, the kernel data structures involved, the detailed fault‑handling flow, different fault types, and their performance impact.
The article traces the founder’s humble beginnings, the technical evolution of the Galaxy Thunder operating system, collaborative breakthroughs, market‑level analysis of OS monopolies, and a product philosophy that balances social responsibility with commercial viability, outlining concrete strategies for hardware compatibility, performance optimization, and future industry impact.
