The patch titled
Subject: mm/page_alloc: move set_page_refcounted() to callers of post_alloc_hook()
has been added to the -mm mm-unstable branch. Its filename is
mm-page_alloc-move-set_page_refcounted-to-callers-of-post_alloc_hook.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-page_alloc-move-set_page_refcounted-to-callers-of-post_alloc_hook.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next via the mm-everything
branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days
------------------------------------------------------
From: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>
Subject: mm/page_alloc: move set_page_refcounted() to callers of post_alloc_hook()
Date: Mon, 25 Nov 2024 21:01:36 +0000
In preparation for allocating frozen pages, stop initialising the page
refcount in post_alloc_hook().
Link: https://lkml.kernel.org/r/20241125210149.2976098-5-willy@xxxxxxxxxxxxx
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Reviewed-by: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Hyeonggon Yoo <42.hyeyoo@xxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxxx>
Cc: Muchun Song <songmuchun@xxxxxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: William Kucharski <william.kucharski@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/compaction.c | 2 ++
mm/internal.h | 3 +--
mm/page_alloc.c | 3 ++-
3 files changed, 5 insertions(+), 3 deletions(-)
--- a/mm/compaction.c~mm-page_alloc-move-set_page_refcounted-to-callers-of-post_alloc_hook
+++ a/mm/compaction.c
@@ -83,6 +83,7 @@ static inline bool is_via_compact_memory
static struct page *mark_allocated_noprof(struct page *page, unsigned int order, gfp_t gfp_flags)
{
post_alloc_hook(page, order, __GFP_MOVABLE);
+ set_page_refcounted(page);
return page;
}
#define mark_allocated(...) alloc_hooks(mark_allocated_noprof(__VA_ARGS__))
@@ -1868,6 +1869,7 @@ again:
dst = (struct folio *)freepage;
post_alloc_hook(&dst->page, order, __GFP_MOVABLE);
+ set_page_refcounted(&dst->page);
if (order)
prep_compound_page(&dst->page, order);
cc->nr_freepages -= 1 << order;
--- a/mm/internal.h~mm-page_alloc-move-set_page_refcounted-to-callers-of-post_alloc_hook
+++ a/mm/internal.h
@@ -735,8 +735,7 @@ static inline void prep_compound_tail(st
extern void prep_compound_page(struct page *page, unsigned int order);
-extern void post_alloc_hook(struct page *page, unsigned int order,
- gfp_t gfp_flags);
+void post_alloc_hook(struct page *page, unsigned int order, gfp_t gfp_flags);
extern bool free_pages_prepare(struct page *page, unsigned int order);
extern int user_min_free_kbytes;
--- a/mm/page_alloc.c~mm-page_alloc-move-set_page_refcounted-to-callers-of-post_alloc_hook
+++ a/mm/page_alloc.c
@@ -1506,7 +1506,6 @@ inline void post_alloc_hook(struct page
int i;
set_page_private(page, 0);
- set_page_refcounted(page);
arch_alloc_page(page, order);
debug_pagealloc_map_pages(page, 1 << order);
@@ -1562,6 +1561,7 @@ static void prep_new_page(struct page *p
unsigned int alloc_flags)
{
post_alloc_hook(page, order, gfp_flags);
+ set_page_refcounted(page);
if (order && (gfp_flags & __GFP_COMP))
prep_compound_page(page, order);
@@ -6358,6 +6358,7 @@ static void split_free_pages(struct list
int i;
post_alloc_hook(page, order, __GFP_MOVABLE);
+ set_page_refcounted(page);
if (!order)
continue;
_
Patches currently in -mm which might be from willy@xxxxxxxxxxxxx are
mm-page_alloc-cache-page_zone-result-in-free_unref_page.patch
mm-make-alloc_pages_mpol-static.patch
mm-page_alloc-export-free_frozen_pages-instead-of-free_unref_page.patch
mm-page_alloc-move-set_page_refcounted-to-callers-of-post_alloc_hook.patch
mm-page_alloc-move-set_page_refcounted-to-callers-of-prep_new_page.patch
mm-page_alloc-move-set_page_refcounted-to-callers-of-get_page_from_freelist.patch
mm-page_alloc-move-set_page_refcounted-to-callers-of-__alloc_pages_cpuset_fallback.patch
mm-page_alloc-move-set_page_refcounted-to-callers-of-__alloc_pages_may_oom.patch
mm-page_alloc-move-set_page_refcounted-to-callers-of-__alloc_pages_direct_compact.patch
mm-page_alloc-move-set_page_refcounted-to-callers-of-__alloc_pages_direct_reclaim.patch
mm-page_alloc-move-set_page_refcounted-to-callers-of-__alloc_pages_slowpath.patch
mm-page_alloc-move-set_page_refcounted-to-end-of-__alloc_pages.patch
mm-page_alloc-add-__alloc_frozen_pages.patch
mm-mempolicy-add-alloc_frozen_pages.patch
slab-allocate-frozen-pages.patch
