The patch titled
Subject: mm: page_owner: add support for splitting to any order in split page_owner
has been added to the -mm mm-unstable branch. Its filename is
mm-page_owner-add-support-for-splitting-to-any-order-in-split-page_owner.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-page_owner-add-support-for-splitting-to-any-order-in-split-page_owner.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Zi Yan <ziy@xxxxxxxxxx>
Subject: mm: page_owner: add support for splitting to any order in split page_owner
Date: Mon, 3 Apr 2023 16:18:36 -0400
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/20230403201839.4097845-5-zi.yan@xxxxxxxx
Signed-off-by: Zi Yan <ziy@xxxxxxxxxx>
Cc: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Cc: Michal Koutný <mkoutny@xxxxxxxx>
Cc: Roman Gushchin <roman.gushchin@xxxxxxxxx>
Cc: Ryan Roberts <ryan.roberts@xxxxxxx>
Cc: Yang Shi <shy828301@xxxxxxxxx>
Cc: Yu Zhao <yuzhao@xxxxxxxxxx>
Cc: Zach O'Keefe <zokeefe@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/page_owner.h | 10 +++++-----
mm/huge_memory.c | 2 +-
mm/page_alloc.c | 4 ++--
mm/page_owner.c | 9 +++++----
4 files changed, 13 insertions(+), 12 deletions(-)
--- a/include/linux/page_owner.h~mm-page_owner-add-support-for-splitting-to-any-order-in-split-page_owner
+++ 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 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
__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(stru
{
}
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)
--- a/mm/huge_memory.c~mm-page_owner-add-support-for-splitting-to-any-order-in-split-page_owner
+++ a/mm/huge_memory.c
@@ -2557,7 +2557,7 @@ static void __split_huge_page(struct pag
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)) {
--- a/mm/page_alloc.c~mm-page_owner-add-support-for-splitting-to-any-order-in-split-page_owner
+++ a/mm/page_alloc.c
@@ -2780,7 +2780,7 @@ void split_page(struct page *page, unsig
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 l
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);
--- a/mm/page_owner.c~mm-page_owner-add-support-for-splitting-to-any-order-in-split-page_owner
+++ a/mm/page_owner.c
@@ -211,19 +211,20 @@ void __set_page_owner_migrate_reason(str
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_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);
_
Patches currently in -mm which might be from ziy@xxxxxxxxxx are
mm-memcg-use-order-instead-of-nr-in-split_page_memcg.patch
mm-page_owner-use-order-instead-of-nr-in-split_page_owner.patch
mm-memcg-make-memcg-huge-page-split-support-any-order-split.patch
mm-page_owner-add-support-for-splitting-to-any-order-in-split-page_owner.patch
mm-thp-split-huge-page-to-any-lower-order-pages.patch
mm-truncate-split-huge-page-cache-page-to-a-non-zero-order-if-possible.patch
mm-huge_memory-enable-debugfs-to-split-huge-pages-to-any-order.patch
