• vmalloc_init


    /* linux/mm/vmalloc.c*/
    struct vmap_area {
        unsigned long va_start;
        unsigned long va_end;
        unsigned long flags;
        struct rb_node rb_node;        /* address sorted rbtree */
        struct list_head list;        /* address sorted list */
        struct list_head purge_list;    /* "lazy purge" list */
        void *private;
        struct rcu_head rcu_head;
    };
    
    /*
    * 显示通过vmalloc分配的内存区域,个vm_struct通过红黑树管理,
    * 红黑树的各节点显示为vmap_area结构体
    */
    struct vm_struct {
        struct vm_struct    *next;
        void            *addr;
        unsigned long        size;
        unsigned long        flags;
        struct page        **pages;
        unsigned int        nr_pages;
        unsigned long        phys_addr;
        void            *caller;
    };
    
    struct vmap_block_queue {
        spinlock_t lock;
        struct list_head free;
        struct list_head dirty;
        unsigned int nr_dirty;
    };
    struct vmap_block {
        spinlock_t lock;
        struct vmap_area *va;
        struct vmap_block_queue *vbq;
        unsigned long free, dirty;
        DECLARE_BITMAP(alloc_map, VMAP_BBMAP_BITS);
        DECLARE_BITMAP(dirty_map, VMAP_BBMAP_BITS);
        union {
            struct list_head free_list;
            struct rcu_head rcu_head;
        };
    };
    /* Queue of free and dirty vmap blocks, for allocation and flushing purposes */
    static DEFINE_PER_CPU(struct vmap_block_queue, vmap_block_queue);
    
    void __init vmalloc_init(void)
    
    /*以下代码应该在 中执行*/
    int rc;
    rc = pcpu_embed_first_chunk(PERCPU_MODULE_RESERVE,PERCPU_DYNAMIC_RESERVE,
            PAGE_SIZE,NULL,pcpu_dfl_fc_alloc,pcpu_dfl_fc_free);  
    if (rc<0)  
        panic("Failed to initialize percpu areas.");
    
    /* 
    * linux/mm/vmalloc.c
    * 全局变量vmlist的初始化流程
    */
    struct vm_struct *vmlist;
    asmlinkage void __init start_kernel(void)
        -->setup_per_cpu_areas();
            -->ssize_t __init pcpu_embed_first_chunk(size_t static_size, size_t reserved_size,
                          ssize_t dyn_size, ssize_t unit_size)
                -->size_t __init pcpu_setup_first_chunk(pcpu_get_page_fn_t get_page_fn,
                         size_t static_size, size_t reserved_size,
                         ssize_t dyn_size, ssize_t unit_size,
                         void *base_addr,
                         pcpu_populate_pte_fn_t populate_pte_fn)
                    -->void __init vm_area_register_early(struct vm_struct *vm, size_t align)
                        -->vmlist = vm;
    
    /*建立vm_struct与vmap_area的关联*/
    #define RB_ROOT    (struct rb_root) { NULL, }
    static struct rb_root vmap_area_root = RB_ROOT;
    static LIST_HEAD(vmap_area_list);
    
    static void __insert_vmap_area(struct vmap_area *va)
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  • 原文地址:https://www.cnblogs.com/yangjiguang/p/8343945.html
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