[PATCH v2 4/7] mm: page_owner: add support for splitting to any order in split page_owner.

[Zi Yan]

From: Zi Yan <ziy@xxxxxxxxxx>

It adds a new_order parameter to set new page order in page owner.
It prepares for upcoming changes to support split huge page to any
lower order.

Signed-off-by: Zi Yan <ziy@xxxxxxxxxx>
---
 include/linux/page_owner.h | 10 +++++-----
 mm/huge_memory.c           |  2 +-
 mm/page_alloc.c            |  4 ++--
 mm/page_owner.c            | 11 ++++++-----
 4 files changed, 14 insertions(+), 13 deletions(-)

diff --git a/include/linux/page_owner.h b/include/linux/page_owner.h
index d7878523adfc..a784ba69f67f 100644
--- a/include/linux/page_owner.h
+++ b/include/linux/page_owner.h
@@ -11,7 +11,7 @@ extern struct page_ext_operations page_owner_ops;
 extern void __reset_page_owner(struct page *page, unsigned short order);
 extern void __set_page_owner(struct page *page,
 			unsigned short order, gfp_t gfp_mask);
-extern void __split_page_owner(struct page *page, int order);
+extern void __split_page_owner(struct page *page, int old_order, int new_order);
 extern void __folio_copy_owner(struct folio *newfolio, struct folio *old);
 extern void __set_page_owner_migrate_reason(struct page *page, int reason);
 extern void __dump_page_owner(const struct page *page);
@@ -31,10 +31,10 @@ static inline void set_page_owner(struct page *page,
 		__set_page_owner(page, order, gfp_mask);
 }
 
-static inline void split_page_owner(struct page *page, int order)
+static inline void split_page_owner(struct page *page, int old_order, int new_order)
 {
 	if (static_branch_unlikely(&page_owner_inited))
-		__split_page_owner(page, order);
+		__split_page_owner(page, old_order, new_order);
 }
 static inline void folio_copy_owner(struct folio *newfolio, struct folio *old)
 {
@@ -56,11 +56,11 @@ static inline void reset_page_owner(struct page *page, unsigned short order)
 {
 }
 static inline void set_page_owner(struct page *page,
-			unsigned int order, gfp_t gfp_mask)
+			unsigned short order, gfp_t gfp_mask)
 {
 }
 static inline void split_page_owner(struct page *page,
-			int order)
+			int old_order, int new_order)
 {
 }
 static inline void folio_copy_owner(struct folio *newfolio, struct folio *folio)
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 106cde74d933..f8a8a72b207d 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -2557,7 +2557,7 @@ static void __split_huge_page(struct page *page, struct list_head *list,
 	unlock_page_lruvec(lruvec);
 	/* Caller disabled irqs, so they are still disabled here */
 
-	split_page_owner(head, order);
+	split_page_owner(head, order, 0);
 
 	/* See comment in __split_huge_page_tail() */
 	if (PageAnon(head)) {
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index ef559795525b..4845ff6c4223 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2780,7 +2780,7 @@ void split_page(struct page *page, unsigned int order)
 
 	for (i = 1; i < (1 << order); i++)
 		set_page_refcounted(page + i);
-	split_page_owner(page, order);
+	split_page_owner(page, order, 0);
 	split_page_memcg(page, order, 0);
 }
 EXPORT_SYMBOL_GPL(split_page);
@@ -4996,7 +4996,7 @@ static void *make_alloc_exact(unsigned long addr, unsigned int order,
 		struct page *page = virt_to_page((void *)addr);
 		struct page *last = page + nr;
 
-		split_page_owner(page, order);
+		split_page_owner(page, order, 0);
 		split_page_memcg(page, order, 0);
 		while (page < --last)
 			set_page_refcounted(last);
diff --git a/mm/page_owner.c b/mm/page_owner.c
index 64233b5b09d5..347861fe9c50 100644
--- a/mm/page_owner.c
+++ b/mm/page_owner.c
@@ -211,20 +211,21 @@ void __set_page_owner_migrate_reason(struct page *page, int reason)
 	page_ext_put(page_ext);
 }
 
-void __split_page_owner(struct page *page, int order)
+void __split_page_owner(struct page *page, int old_order, int new_order)
 {
 	int i;
 	struct page_ext *page_ext = page_ext_get(page);
 	struct page_owner *page_owner;
-	unsigned int nr = 1 << order;
+	unsigned int old_nr = 1 << old_order;
+	unsigned int new_nr = 1 << new_order;
 
 	if (unlikely(!page_ext))
 		return;
 
-	for (i = 0; i < nr; i++) {
+	for (i = 0; i < old_nr; i += new_nr) {
+		page_ext = lookup_page_ext(page + i);
 		page_owner = get_page_owner(page_ext);
-		page_owner->order = 0;
-		page_ext = page_ext_next(page_ext);
+		page_owner->order = new_order;
 	}
 	page_ext_put(page_ext);
 }
-- 
2.39.2