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Deepin Linux
Deepin Linux
Mar 24, 2025 · Fundamentals

Understanding Page Fault Handling and Virtual Memory Management in the uCore Kernel

This article explains how Linux-like operating systems use virtual memory and the MMU to map virtual addresses to physical memory, describes the data structures (vma_struct and mm_struct) used by uCore, details the page‑fault handling flow, classifies fault types, and shows how these mechanisms affect system performance.

KernelMemory ManagementOperating System
0 likes · 27 min read
Understanding Page Fault Handling and Virtual Memory Management in the uCore Kernel
OPPO Kernel Craftsman
OPPO Kernel Craftsman
Aug 9, 2024 · Fundamentals

Linux Kernel Memory Management Locks and Optimization Case Studies

The article examines Linux kernel 6.9 memory-management locks—PG_locked, lru_lock, mmap_lock, anon_vma rwsem, mapping i_mmap_rwsem, and shrinker_rwsem—explaining their roles and presenting eight community-driven optimizations such as per-memcg lru_lock, per-VMA locks, speculative faults, and lock-less shrinker techniques to improve concurrency and performance.

LRU LockLinux kernelMemory Management
0 likes · 24 min read
Linux Kernel Memory Management Locks and Optimization Case Studies
Deepin Linux
Deepin Linux
Jul 17, 2024 · Fundamentals

Understanding Page Fault Handling and Virtual Memory Management in uCore OS

This article explains the principles of virtual memory, the data structures and functions used in uCore to manage page faults, and how the operating system handles demand paging, page swapping, and invalid accesses through detailed code examples and workflow descriptions.

KernelMemory ManagementOperating System
0 likes · 23 min read
Understanding Page Fault Handling and Virtual Memory Management in uCore OS
Deepin Linux
Deepin Linux
Nov 9, 2023 · Fundamentals

Understanding Linux Memory Mapping (mmap): API, Implementation, and Use Cases

This article explains Linux memory mapping (mmap), covering its purpose, API parameters, different mapping types, internal kernel implementation, page‑fault handling, copy‑on‑write semantics, practical use cases, and includes a complete Objective‑C example demonstrating file mapping and manipulation.

Copy-on-WriteLinux kernelMMAP
0 likes · 27 min read
Understanding Linux Memory Mapping (mmap): API, Implementation, and Use Cases
Xianyu Technology
Xianyu Technology
Sep 14, 2022 · Operations

Root Cause Analysis of Nighttime Service Latency Caused by Major Page Faults in Category Client

The nightly service latency spikes were traced to major page faults triggered by the category client’s lazy mmap of a 1.7 GB off‑heap store during package switches, not to GC or CPU throttling, and were resolved by upgrading to a version that pre‑loads the store in 64 MB chunks with brief pauses.

ContainerJVMPerformance
0 likes · 15 min read
Root Cause Analysis of Nighttime Service Latency Caused by Major Page Faults in Category Client
OPPO Kernel Craftsman
OPPO Kernel Craftsman
Jun 11, 2021 · Fundamentals

Analysis of Linux mmap File Read Process and Page Fault Handling

The article walks through Linux’s mmap file‑read workflow—from the kernel entry point and VMA creation, through page‑fault handling that allocates pages and invokes synchronous or asynchronous readahead, to munmap’s unmapping steps and the deferred file‑cache reclamation mechanisms.

KernelLinuxMMAP
0 likes · 10 min read
Analysis of Linux mmap File Read Process and Page Fault Handling
360 Smart Cloud
360 Smart Cloud
Jun 1, 2021 · Fundamentals

Physical Address Space Management and Memory Allocation in Linux (NUMA, Nodes, Zones, Pages, Slab, and Page Fault Handling)

This article explains how Linux manages physical address space using SMP and NUMA architectures, describes the node, zone, and page data structures, details page allocation via the buddy system and slab allocator, and outlines user‑ and kernel‑mode page‑fault handling, swapping, and address translation mechanisms.

KernelLinuxMemory Management
0 likes · 17 min read
Physical Address Space Management and Memory Allocation in Linux (NUMA, Nodes, Zones, Pages, Slab, and Page Fault Handling)
Tencent Cloud Developer
Tencent Cloud Developer
Sep 3, 2019 · Mobile Development

Improving iOS App Launch Speed with Binary Reordering and Page Fault Reduction

By generating an order file that places frequently executed code contiguously, the authors reduce iOS app cold‑launch page faults by about 15%, achieving roughly a 10% launch‑time improvement without code changes, using runtime hooking and static analysis to build the symbol ordering.

App LaunchBinary ReorderingHooking
0 likes · 13 min read
Improving iOS App Launch Speed with Binary Reordering and Page Fault Reduction