[PATCH 3/7] mm: Add thp_order
From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Date: 2020-06-29 21:13:24
Also in:
linux-fsdevel
Subsystem:
memory management - thp (transparent huge page), the rest · Maintainers:
Andrew Morton, David Hildenbrand, Lorenzo Stoakes, Linus Torvalds
This function returns the order of a transparent huge page. It compiles to 0 if CONFIG_TRANSPARENT_HUGEPAGE is disabled. Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> --- include/linux/huge_mm.h | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+)
diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index 71f20776b06c..dd19720a8bc2 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h@@ -265,6 +265,19 @@ 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)))
@@ -324,6 +337,12 @@ 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);
--
2.27.0