Main Content: Mapping of Physical Memory and Virtual Memory Initialization of Physical Memory at Boot Time Buddy System for Allocating Physical Memory Pages SLAB Allocator for Allocating Physical Memory Blocks vmalloc for Allocating Virtual Memory Pages mmap Memory Mapping Principles malloc for Dynamic Memory Allocation Page Fault Interrupts
`/proc/meminfo` is an important virtual file in the Linux system that provides detailed information about system memory usage. The following are the meanings of each metric: ## Main Memory Metrics 1. MemTotal: Total system memory (physical memory minus reserved and kernel-occupied portions) 2. MemFree: Memory that is completely unused 3. MemAvailable: Estimated memory available for … Read more
In Linux systems, the memory management mechanism utilizes free memory to cache various data to improve performance. Below is a detailed analysis of whether different components occupy **Cache** (cached memory): — ## **1. Relationship Between Memory and Cache** – **File System Cache (Cached)**: Linux actively caches read files in memory (i.e., `Cached`) to speed up … Read more
1. Origin of the Problem: When using a Linux system, we often find that the cache occupies a large amount of memory. For example, when checking memory status with the `free` command, we may see that `buff/cache` has already taken up 2.1G of memory. Since the Linux 2.4 version, “buffer” and “cache” have been unified … Read more
Recommended reading with complete source code | C Language Implementation of Library Management System (Data Persistence Version) with complete source code | C Language Implementation of Student Information Management System C Language Functions: From Beginner to Proficiency, a comprehensive article to thoroughly understand C Language Pointers: From Beginner to Proficiency, a comprehensive article to thoroughly … Read more
Scan the code to follow Chip Dynamics and say goodbye to “chip” congestion! Search WeChatChip Dynamics Imagine opening a Russian nesting doll, and inside is an even smaller doll, and then another… The concept of a pointer to a pointer in C language (double pointer) is like this nesting doll game! Each layer of pointer … Read more
Scan the code to follow Chip Dynamics and say goodbye to “chip” congestion! Search WeChatChip Dynamics In the world of C language, pointers are the “soul tool”, but ordinary pointers (like int* and char*) are like “custom keys”—a key can only open one lock. However, the void* pointer is like a “universal key”: it can … Read more
1. Introduction Board Support Package (BSP) is the hardware abstraction layer for VxWorks, responsible for initializing the processor, memory, clocks, interrupt controllers, and peripherals at system startup, and then handing control over to the operating system kernel. Without a suitable BSP, VxWorks cannot run on your hardware. BSPs are typically highly dependent on specific hardware … Read more
In ESP32 development, optimizing memory management is a key aspect of enhancing system performance and stability. Below are some memory management optimization strategies based on ESP32 features and common issues, covering heap memory configuration, peripheral optimization, static allocation, task stack management, and more: 1. Heap Memory Management Optimization 1.1 Initialize Heap Memory Manager ESP-IDF provides … Read more
Hello everyone, welcome to Lixin Embedded. Recently, while optimizing an industrial control project, I encountered the age-old problem of dynamic memory allocation once again. First, let’s talk about dynamic memory allocation. When coding on a PC, using new to create an object and delete to remove it is quite normal. Not enough memory? Just add … Read more