CMA 为了解决上述问题,三星公司的Michal Nazarewicz 与2010年提出CMA(contiguous memory allocator)The Contiguous Memory Allocator [LWN.net],用于解决连续物理内存申请问题: CMA试图采用一个灵活的解决方案以满足不同的需求,CMA同样将物理内存中预留出连续物理内存区域(CMA),但是该区域的物理内存不仅仅局限于CMA内存申...
* subsystems (like slab allocator) are available.*///1. memblock是系统最初的内存管理器,分为memory type和reserved type,CMA最开始就属于reserved type//2. 运行到这里,就表示memblock已经建立,并且buddy还没建立,CMA在buddy前建立OK//3. CMA建立OK后,接着memblock中的memory type会释放给buddy,reserved typ...
* subsystems (like slab allocator) are available. */ //1.memblock是系统最初的内存管理器,分为memory type和reserved type,CMA最开始就属于reserved type //2. 运行到这里,就表示memblock已经建立,并且buddy还没建立,CMA在buddy前建立OK //3. CMA建立OK后,接着memblock中的memory type会释放给buddy,reserved...
【Linux系列】CMA (Contiguous Memory Allocator) 简单介绍 CMA (Contiguous Memory Allocator) CMA是Linux内核中的一种内存分配机制,用于分配物理上连续的内存块。它主要解决了在系统运行一段时间后,物理内存碎片化导致难以分配大块连续物理内存的问题。 CMA的工作原理 在系统启动时,CMA会预留一块连续的物理内存区域。 ...
CMA的全称是contiguous memory allocator, 其工作原理是:预留一段的内存给 驱动使用,但当驱动不用的时候,memory allocator(buddy system)可以分配给用户进程用作匿名内存或者页缓存。而当驱动需要使用时,就将进程占用的内存通过回收或者迁移的方式将之前占用的预留内存腾出来, 供驱动使用。
Michal Nazarewicz于2010年提出Contiguous Memory Allocator（CMA），旨在提供一个灵活的解决方案，以满足不同需求。CMA将物理内存中预留出特定区域专门用于连续内存申请，该区域不仅用于CMA内存申请，还能用于标记为可移动的内存申请，避免了内存浪费。当CMA需要连续物理内存时，若发现申请区域已被可移动内存...
Linux Contiguous Memory Allocator (CMA) aims to provide both contiguous memory allocation and to maximize memory utilization based on page migration, but they suffer from unpredictably long latency and a high probability of allocation failure. Therefore, we introduce a new solution to this problem, ...
Almost one year ago, LWNlooked at the contiguous memory allocator (CMA) patcheswhich were meant to be an answer to this problem. This patch set followed the venerable tradition of reserving a chunk of memory at boot time for the sole purpose of satisfying large allocation requests. Over the ...
allocator>C This command will compact unused holes of memory into one region. Finally, the STAT command for reporting the status of memory is entered as: allocator>STAT Given this command, your program will report the regions of memory that are allocated and the regions that are unused. For ...
目前,Marek Szyprowski和Michal Nazarewicz实现了一套全新的Contiguous Memory Allocator。...声明连续内存内核启动过程中arch/arm/mm/init.c中的arm_memblock_init()会调用dma_contiguous_reserve(min(arm_dma_limit, arm_lowmem_limit...)); 该函数位于:drivers/base/dma-contiguous.c /** * dma_contiguous_...