PageHead

函数名称：PageHead

函数原型：static inline __attribute__((__always_inline__)) int PageHead(struct page *page)

返回类型：int

参数：

类型	参数	名称
struct page *	page

**调用者**
名称	描述
lru_add_page_tail	sed by __split_huge_page_refcount()
page_remove_file_rmap
page_huge_active	Test to determine whether the hugepage is "active/in-use" (i.e. being linked* to hstate->hugepage_activelist.)* This function can be called for tail pages, but never returns true for them.
PageHeadHuge	PageHeadHuge() only returns true for hugetlbfs head page, but not for* normal or transparent huge pages.
isolate_huge_page
putback_active_hugepage
add_page_for_migration	Resolves the given address to a struct page, isolates it from the LRU and* puts it to the given pagelist
copy_huge_pmd
do_huge_pmd_wp_page_fallback
do_huge_pmd_wp_page
follow_trans_huge_pmd
zap_huge_pmd
unmap_page
get_mctgt_type_thp	We don't consider PMD mapped swapping or file mapped pages because THP does* not support them for now.* Caller should make sure that pmd_trans_huge(pmd) is true.
ClearPageCompound
PageTransHuge	PageHuge() only returns true for hugetlbfs pages, but not for* normal or transparent huge pages.* PageTransHuge() returns true for both transparent huge and* hugetlbfs pages, but not normal pages. PageTransHuge() can only be
PageDoubleMap	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)
SetPageDoubleMap
ClearPageDoubleMap
TestSetPageDoubleMap
TestClearPageDoubleMap
compound_order

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