mm: add thp_order (6ffbb458) · Commits · 戴 / test

This function returns the order of a transparent huge page. It compiles to 0 if CONFIG_TRANSPARENT_HUGEPAGE is disabled. Signed-off-by:

Zi Yan <ziy@nvidia.com> Cc: David Hildenbrand <david@redhat.com> Cc: Mike Kravetz <mike.kravetz@oracle.com> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Link: http://lkml.kernel.org/r/20200629151959.15779-4-willy@infradead.org Signed-off-by:

include/linux/huge_mm.h

+19 −0

Original line number	Diff line number	Diff line
		@@ -258,6 +258,19 @@ static inline spinlock_t pud_trans_huge_lock(pud_t pud,
		else
		return NULL;
		}

		/**
		* thp_order - Order of a transparent huge page.
		* @page: Head page of a transparent huge page.
		*/
		static inline unsigned int thp_order(struct page *page)
		{
		VM_BUG_ON_PGFLAGS(PageTail(page), page);
		if (PageHead(page))
		return HPAGE_PMD_ORDER;
		return 0;
		}

		static inline int hpage_nr_pages(struct page *page)
		{
		if (unlikely(PageTransHuge(page)))
		@@ -317,6 +330,12 @@ static inline struct list_head page_deferred_list(struct page page)
		#define HPAGE_PUD_MASK ({ BUILD_BUG(); 0; })
		#define HPAGE_PUD_SIZE ({ BUILD_BUG(); 0; })

		static inline unsigned int thp_order(struct page *page)
		{
		VM_BUG_ON_PGFLAGS(PageTail(page), page);
		return 0;
		}

		static inline int hpage_nr_pages(struct page *page)
		{
		VM_BUG_ON_PAGE(PageTail(page), page);