From: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx> Subject: mm/page_owner: change split_page_owner to take a count The implementation of split_page_owner() prefers a count rather than the old order of the page. When we support a variable size THP, we won't have the order at this point, but we will have the number of pages. So change the interface to what the caller and callee would prefer. Link: https://lkml.kernel.org/r/20200908195539.25896-4-willy@xxxxxxxxxxxxx Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx> Acked-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx> Reviewed-by: SeongJae Park <sjpark@xxxxxxxxx> Cc: Huang Ying <ying.huang@xxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- include/linux/page_owner.h | 6 +++--- mm/huge_memory.c | 2 +- mm/page_owner.c | 4 ++-- 3 files changed, 6 insertions(+), 6 deletions(-) --- a/include/linux/page_owner.h~mm-page_owner-change-split_page_owner-to-take-a-count +++ a/include/linux/page_owner.h @@ -11,7 +11,7 @@ extern struct page_ext_operations page_o extern void __reset_page_owner(struct page *page, unsigned int order); extern void __set_page_owner(struct page *page, unsigned int order, gfp_t gfp_mask); -extern void __split_page_owner(struct page *page, unsigned int order); +extern void __split_page_owner(struct page *page, unsigned int nr); extern void __copy_page_owner(struct page *oldpage, struct page *newpage); extern void __set_page_owner_migrate_reason(struct page *page, int reason); extern void __dump_page_owner(struct page *page); @@ -31,10 +31,10 @@ static inline void set_page_owner(struct __set_page_owner(page, order, gfp_mask); } -static inline void split_page_owner(struct page *page, unsigned int order) +static inline void split_page_owner(struct page *page, unsigned int nr) { if (static_branch_unlikely(&page_owner_inited)) - __split_page_owner(page, order); + __split_page_owner(page, nr); } static inline void copy_page_owner(struct page *oldpage, struct page *newpage) { --- a/mm/huge_memory.c~mm-page_owner-change-split_page_owner-to-take-a-count +++ a/mm/huge_memory.c @@ -2454,7 +2454,7 @@ static void __split_huge_page(struct pag ClearPageCompound(head); - split_page_owner(head, HPAGE_PMD_ORDER); + split_page_owner(head, HPAGE_PMD_NR); /* See comment in __split_huge_page_tail() */ if (PageAnon(head)) { --- a/mm/page_owner.c~mm-page_owner-change-split_page_owner-to-take-a-count +++ a/mm/page_owner.c @@ -204,7 +204,7 @@ void __set_page_owner_migrate_reason(str page_owner->last_migrate_reason = reason; } -void __split_page_owner(struct page *page, unsigned int order) +void __split_page_owner(struct page *page, unsigned int nr) { int i; struct page_ext *page_ext = lookup_page_ext(page); @@ -213,7 +213,7 @@ void __split_page_owner(struct page *pag if (unlikely(!page_ext)) return; - for (i = 0; i < (1 << order); i++) { + for (i = 0; i < nr; i++) { page_owner = get_page_owner(page_ext); page_owner->order = 0; page_ext = page_ext_next(page_ext); _
