obj_malloc

static unsigned long obj_malloc(struct size_class *class,
                struct zspage *zspage, unsigned long handle)
{
    int i, nr_page, offset;
    unsigned long obj;
    struct link_free *link;
 
    struct page *m_page;
    unsigned long m_offset;
    void *vaddr;
 
    handle |= OBJ_ALLOCATED_TAG;
    obj = get_freeobj(zspage);
 
    offset = obj * class->size;
    nr_page = offset >> PAGE_SHIFT;
    m_offset = offset & ~PAGE_MASK;
    m_page = get_first_page(zspage);
 
    for (i = 0; i < nr_page; i++)
        m_page = get_next_page(m_page);
 
    vaddr = kmap_atomic(m_page);
    link = (struct link_free *)vaddr + m_offset / sizeof(*link);
    set_freeobj(zspage, link->next >> OBJ_TAG_BITS);
    if (likely(!PageHugeObject(m_page)))
        /* record handle in the header of allocated chunk */
        link->handle = handle;
    else
        /* record handle to page->index */
        zspage->first_page->index = handle;
 
    kunmap_atomic(vaddr);
    mod_zspage_inuse(zspage, 1);
    zs_stat_inc(class, OBJ_USED, 1);
 
    obj = location_to_obj(m_page, obj);
 
    return obj;
}
函数源码
