count_vma_pages_range

Name:count_vma_pages_range

Proto:static unsigned long count_vma_pages_range(struct mm_struct *mm, unsigned long addr, unsigned long end)

Type:unsigned long

Parameter:

Type	Parameter	Name
struct mm_struct *	mm
unsigned long	addr
unsigned long	end

563

nr_pages = 0

567

vma = Look up the first VMA which intersects the interval start_addr..end_addr-1,NULL if none. Assume start_addr < end_addr.

568

If Not vma Then Return 0

571

nr_pages = min - return minimum of two values of the same or compatible types*@x: first value*@y: second value(end, The first byte after our end addresswithin vm_mm. ) - max - return maximum of two values of the same or compatible types*@x: first value*@y: second value(addr, Our start address within vm_mm. ) >> PAGE_SHIFT determines the page size

575

When vma cycle

578

If Our start address within vm_mm. > end Then Break

581

overlap_len = min - return minimum of two values of the same or compatible types*@x: first value*@y: second value(end, The first byte after our end addresswithin vm_mm. ) - Our start address within vm_mm.

582

nr_pages += overlap_len >> PAGE_SHIFT determines the page size

585

Return nr_pages

**Caller**
Name	Describe
mmap_region

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