From: Zi Yan ziy@nvidia.com
mainline inclusion from mainline-v6.9-rc1 commit 46d44d09d24c5b451d6ab8f0fca5a40f651e3837 category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I9OCYO CVE: NA
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
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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.
Link: https://lkml.kernel.org/r/20240226205534.1603748-7-zi.yan@sent.com Signed-off-by: Zi Yan ziy@nvidia.com Cc: David Hildenbrand david@redhat.com Acked-by: David Hildenbrand david@redhat.com Cc: Kirill A. Shutemov kirill.shutemov@linux.intel.com Cc: Luis Chamberlain mcgrof@kernel.org Cc: "Matthew Wilcox (Oracle)" willy@infradead.org Cc: Michal Koutny mkoutny@suse.com Cc: Roman Gushchin roman.gushchin@linux.dev Cc: Ryan Roberts ryan.roberts@arm.com Cc: Yang Shi shy828301@gmail.com Cc: Yu Zhao yuzhao@google.com Cc: Zach O'Keefe zokeefe@google.com Signed-off-by: Andrew Morton akpm@linux-foundation.org Signed-off-by: Liu Shixin liushixin2@huawei.com --- include/linux/page_owner.h | 13 ++++++++----- mm/huge_memory.c | 2 +- mm/page_alloc.c | 4 ++-- mm/page_owner.c | 7 +++---- 4 files changed, 14 insertions(+), 12 deletions(-)
diff --git a/include/linux/page_owner.h b/include/linux/page_owner.h index 2b39c8e19d98..debdc25f08b9 100644 --- a/include/linux/page_owner.h +++ b/include/linux/page_owner.h @@ -11,7 +11,8 @@ 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 +32,11 @@ 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) { @@ -56,10 +58,11 @@ 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) +static inline void split_page_owner(struct page *page, 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 9f7b29f3b10c..b56bbb88bec9 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -2800,7 +2800,7 @@ 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 46a2b5950b4e..f54060a48806 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -2661,7 +2661,7 @@ 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); @@ -5055,7 +5055,7 @@ 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 125113b9f729..41993f140f1b 100644 --- a/mm/page_owner.c +++ b/mm/page_owner.c @@ -215,19 +215,18 @@ 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;
if (unlikely(!page_ext)) return;
- for (i = 0; i < nr; i++) { + for (i = 0; i < (1 << old_order); i++) { page_owner = get_page_owner(page_ext); - page_owner->order = 0; + page_owner->order = new_order; page_ext = page_ext_next(page_ext); } page_ext_put(page_ext);