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From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
To: linux-fsdevel@vger.kernel.org, linux-mm@kvack.org,
	Andrew Morton <akpm@linux-foundation.org>
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Subject: [PATCH 3/7] mm: Add thp_order
Date: Mon, 29 Jun 2020 16:19:55 +0100
Message-ID: <20200629151959.15779-4-willy@infradead.org> (raw)
In-Reply-To: <20200629151959.15779-1-willy@infradead.org>

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


  parent reply index

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-29 15:19 [PATCH 0/7] THP prep patches Matthew Wilcox (Oracle)
2020-06-29 15:19 ` [PATCH 1/7] mm: Store compound_nr as well as compound_order Matthew Wilcox (Oracle)
2020-06-29 16:22   ` Ira Weiny
2020-06-29 16:24     ` Matthew Wilcox
2020-07-06 10:29   ` Kirill A. Shutemov
2020-08-11 22:53     ` Matthew Wilcox
2020-06-29 15:19 ` [PATCH 2/7] mm: Move page-flags include to top of file Matthew Wilcox (Oracle)
2020-06-29 15:19 ` Matthew Wilcox (Oracle) [this message]
2020-06-29 15:19 ` [PATCH 4/7] mm: Add thp_size Matthew Wilcox (Oracle)
2020-06-29 15:19 ` [PATCH 5/7] mm: Replace hpage_nr_pages with thp_nr_pages Matthew Wilcox (Oracle)
2020-06-29 17:40   ` Mike Kravetz
2020-06-29 18:14     ` Matthew Wilcox
2020-06-29 18:32       ` Matthew Wilcox
2020-07-01  1:33         ` Andrew Morton
2020-06-29 15:19 ` [PATCH 6/7] mm: Add thp_head Matthew Wilcox (Oracle)
2020-06-29 15:19 ` [PATCH 7/7] mm: Introduce offset_in_thp Matthew Wilcox (Oracle)
2020-06-29 17:11 ` [PATCH 0/7] THP prep patches William Kucharski
2020-06-29 18:13 ` Zi Yan

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