Introduction to RT thread kernel (5) -- memory management

Basic concepts
There are two kinds of storage space in computer system , One is internal storage space RAM（ Ram ） Fast access , External storage space ROM（ read-only memory ） Stable stored data .

Two memory management algorithms
Static memory allocation algorithm ： Allocate memory blocks of the preset size during user initialization in the static memory pool , Ensure the reliability of the equipment, but consider the upper limit of memory , Memory efficiency is low , Efficient distribution and use
Dynamic memory allocation algorithm ： Allocate memory blocks of the size specified by the user in the dynamic memory pool , High memory efficiency , Memory pools are prone to fragmentation

Dynamic memory management algorithm Small memory management algorithm and SLAB Memory management algorithm

Interface function of static memory management ：

Initialize memory pool ：rt_mp_init
Out of memory pool ：rt_thread_detach
Create a memory pool ：rt_thread_create
Delete memory pool ：rt_thread_delete
Static memory application function :rt_mp_alloc
j Static memory release function ：rt_mp_free

Common interface functions for dynamic memory management ：
Memory heap system initialization ：rt_system_heap_init
Allocate memory blocks ：rt_malloc
Free memory block ：rt_free
Reallocate memory blocks ：rt_realloc
Allocate multiple memory blocks ：rt_calloc