PageDoubleMap

Name:PageDoubleMap indicates that the compound page is mapped with PTEs as well* as PMDs.* This is required for optimization of rmap operations for THP: we can postpone* per small page mapcount accounting (and its overhead from atomic operations)

Proto:static inline int PageDoubleMap(struct page *page)

Type:int

Parameter:

Type	Parameter	Name
struct page *	page

**Caller**
Name	Describe
__page_mapcount	Slow path of page_mapcount() for compound pages
mlock_vma_page	Mark page as mlocked if not already.* If page on LRU, isolate and putback to move to unevictable list.
try_to_munlock	ry_to_munlock - try to munlock a page@page: the page to be munlocked Called from munlock code. Checks all of the VMAs mapping the page* to make sure nobody else has this page mlocked. The page will be
page_trans_huge_map_swapcount
follow_trans_huge_pmd
total_mapcount
page_trans_huge_mapcount	This calculates accurately how many mappings a transparent hugepage* has (unlike page_mapcount() which isn't fully accurate)

Function report