LDD-Allocating Memory

1 #include <linux/slab.h>
2 void *kmalloc(size_t size, int flags);

1 kmem_cache_t *kmem_cache_create(const char *name, size_t size, size_t offset,
2             unsigned long flags, void (*constructor)(void *, kmem_cache_t *, unsigned long flags),
3             void (*destructor)(void *, kmem_cache_t *, unsigned long flags));

1 void *kmem_cache_alloc(kmem_cache_t *cache, int flags);
2 void kmem_cache_free(kmem_cache_t *cache, const void *obj);

1 int kmem_cache_destroy(kmem_cache_t *cache);

1 mempool_t *mempool_create(int min_nr,
2                           mempool_alloc_t *alloc_fn,
3                           mempool_free_t *free_fn,
4                           void *pool_data);

1 typedef void *(mempool_alloc_t)(int gfp_mask, void *pool_data);
2 typedef void (mempool_free_t)(void *element, void *pool_data);

1 int mempool_resize(mempool_t *pool, int new_min_nr, int gfp_mask);
2 void mempool_destory(mempool_t *pool);

1 get_zeroed_page(unsigned int flags);
2 __get_free_page(unsigned int flags);
3 __get_free_pages(unsigned int flags, unsigned int order);     //页面的数量为2^order，最大值为10或11

1 void free_page(unsigned long addr);
2 void free_pages(unsinged long addr, unsigned long order);

1 struct page *alloc_pages(unsigned int flags, unsigned int order);
2 struct page *alloc_page(unsigned int flags);

1 void __free_page(struct page *page);
2 void __free_pages(struct page *page, unsigned int order);
3 void free_hot_page(struct page *page);       //影响cache的行为
4 void free_cold_page(struct page *page);

1 #include <linux/vmalloc.h>
2 void *vmalloc(unsigned long size);
3 void vfree(void * addr);
4 void *ioremap(unsigned long offset, unsigned long size);
5 void iounmap(void * addr);

1 DEFINE_PER_CPU(type, name);
2 DEFINE_PER_CPU(int[3], my_percpu_array);

1 get_cpu_var(sockets_in_use)++;
2 put_cpu_var(sockets_in_use);

1 void *alloc_percpu(type);
2 void *__alloc_percpu(size_t size, size_t align);

1 int cpu;
2 cpu = get_cpu();    //防止cpu被抢占
3 ptr = per_cpu_ptr(per_cpu_var, cpu);
4 /* 操作每CPU变量*/
5 put_cpu();

1 DECLARE_PER_CPU(type, name);
2 EXPORT_PER_CPU_SYMBOL(per_cpu_var);
3 EXPORT_PER_CPU_SYMBOL_GPL(per_cpu_var);

1 #include <linux/bootmem.h>
2 void *alloc_bootmem(unsigned long size);
3 void *alloc_bootmem_low(unsigned long size);
4 void *alloc_bootmem_pages(unsigned long size);
5 void *alloc_bootmem_low_pages(unsigned long size);

1 void free_bootmem(unsigned long addr, unsigned long size);