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FreeRTOS移植SLAB内存管理

 4 years ago
source link: https://www.taterli.com/7122/
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之前一直用连续内存管理,要不碎片化严重,要不分配效率低下,最近读内核源码发现slab/slub/slob这个内存管理器,虽然现在已经多年没人维护,主流已经切换为slub,但是在单片机只有几MB片外内存来说,SLAB还是不错的,而且,已经有rtt移植了slab,就更方便我继续参考移植.

在STM32H769NI和LPC4357FET256测试OK.

驱动文件:

https://gist.github.com/nickfox-taterli/b1509673edc25ece10c6d8e3a927af48

头文件

#ifndef _BSP_SLAB_H_
#define _BSP_SLAB_H_

#include "<单片机特定头>.h"
#include "string.h"

#define SLAB_MEM_STATS
#define MM_PAGE_SIZE 4096
#define MM_PAGE_MASK                 (MM_PAGE_SIZE - 1)
#define MM_PAGE_BITS                 12

void slab_system_heap_init(void *begin_addr, void *end_addr);
void *slab_malloc(uint32_t size);
void *slab_realloc(void *ptr, uint32_t size);
void *slab_calloc(uint32_t count, uint32_t size);
void slab_free(void *ptr);

#ifdef SLAB_MEM_STATS
void slab_memory_info(uint32_t *total,uint32_t *used,uint32_t *max_used);
#endif

#endif

使用示例:

// SDRAM地址范围:0xA0000000 - 0xA2000000
slab_system_heap_init((void *)0xA0000000, (void *)0xA2000000);

for (;;)
{
    slab_memory_info(&total, &used, &max_used);
    buf = slab_malloc(3000);
    slab_memory_info(&total, &used, &max_used);
    slab_free(buf);
    vTaskDelay(1000);
}

report

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