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Deepin Linux
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Deepin Linux

Research areas: Windows & Linux platforms, C/C++ backend development, embedded systems and Linux kernel, etc.

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Recent Articles

Latest from Deepin Linux

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Deepin Linux
Deepin Linux
Dec 14, 2025 · Fundamentals

Why Linux Kernel Memory Layout Is the Hidden Key to Preventing OOM Crashes

This article reveals how Linux kernel memory layout—its partitions, address allocation, and resource scheduling—directly impacts system stability, explains the roles of each memory region, demonstrates common pitfalls like fragmentation and dentry leaks, and provides practical debugging and optimization techniques for developers and operators.

Kernel MemoryLinuxOOM
0 likes · 60 min read
Why Linux Kernel Memory Layout Is the Hidden Key to Preventing OOM Crashes
Deepin Linux
Deepin Linux
Dec 12, 2025 · Fundamentals

Unlocking ARM64 Memory: How Virtual Addresses Map to Physical Memory

This article explains the fundamentals of Linux arm64 memory management, covering virtual and physical memory concepts, MMU operation, page table structures, address translation steps, page fault handling, and practical C++ examples for allocation, mapping, and performance optimization using huge pages and pre‑paging techniques.

ARM64Linuxmemory management
0 likes · 38 min read
Unlocking ARM64 Memory: How Virtual Addresses Map to Physical Memory
Deepin Linux
Deepin Linux
Dec 7, 2025 · Fundamentals

How CPU Context Switching Powers Multitasking: From Theory to Code

This article explains the fundamentals of CPU context switching, covering the hardware and kernel mechanisms, step‑by‑step saving and restoring of registers, scheduling algorithms, different types of switches, performance costs, optimization techniques, and includes a complete C++ simulation example.

CPUMultitaskingPerformance Optimization
0 likes · 42 min read
How CPU Context Switching Powers Multitasking: From Theory to Code
Deepin Linux
Deepin Linux
Dec 2, 2025 · Fundamentals

Why CPU Cache Misses Slow Down Your Linux System—and How to Fix Them

CPU caches bridge the speed gap between processors and memory, but cache misses can dramatically degrade performance, especially under high concurrency or big‑data workloads; this article explains cache architecture, common miss causes, diagnostic tools like perf and cachestat, and practical optimization techniques for Linux systems.

CPU cacheCache OptimizationLinux performance
0 likes · 44 min read
Why CPU Cache Misses Slow Down Your Linux System—and How to Fix Them
Deepin Linux
Deepin Linux
Nov 30, 2025 · Fundamentals

When Does C++ Generate a Default Copy Constructor? A Deep Dive

This article explains the role of copy constructors in C++, when the compiler automatically provides a default one, the situations that trigger copy construction, why bitwise copying can be unsafe, and how to implement proper deep‑copy semantics with clear code examples.

CCopy ConstructorDefault Constructor
0 likes · 31 min read
When Does C++ Generate a Default Copy Constructor? A Deep Dive
Deepin Linux
Deepin Linux
Nov 28, 2025 · Backend Development

Boosting C++ Thread Pool Performance: Queue and Memory Optimizations

This article explains why C++ thread pools often hit bottlenecks in high‑concurrency scenarios and provides practical techniques—such as lock‑granularity tuning, lock‑free queues, object‑pool reuse, and pre‑allocation—to improve task scheduling and memory management without relying on external frameworks.

C++OptimizationThread Pool
1 likes · 44 min read
Boosting C++ Thread Pool Performance: Queue and Memory Optimizations
Deepin Linux
Deepin Linux
Nov 27, 2025 · Backend Development

How epoll Scales to Millions of Connections Using Red‑Black Trees and Ready Lists

This article explains the inner workings of Linux's epoll mechanism, detailing how red‑black trees manage registered file descriptors and how a ready‑list delivers events in O(1) time, covering core APIs, data structures, insertion‑deletion logic, and the full kernel‑space to user‑space flow.

Event-drivenLinuxRed-Black Tree
0 likes · 54 min read
How epoll Scales to Millions of Connections Using Red‑Black Trees and Ready Lists
Deepin Linux
Deepin Linux
Nov 23, 2025 · Operations

Uncover the Hidden skb Buffer Bottleneck Causing Linux Network Packet Loss

Discover how the Linux kernel’s skb buffer can silently drop packets despite full NIC utilization, learn the three primary causes—driver ring buffer overflow, kernel queue saturation, and CPU interrupt imbalance—and follow step‑by‑step diagnostics with ethtool, softnet_stat, and sysctl to tune parameters and eliminate this hidden performance killer.

LinuxPerformancekernel
0 likes · 36 min read
Uncover the Hidden skb Buffer Bottleneck Causing Linux Network Packet Loss