The patch titled
Subject: mm/page_alloc: move set_page_refcounted() to callers of prep_new_page()
has been added to the -mm mm-unstable branch. Its filename is
mm-page_alloc-move-set_page_refcounted-to-callers-of-prep_new_page.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-prep_new_page.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: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>
Subject: mm/page_alloc: move set_page_refcounted() to callers of prep_new_page()
Date: Mon, 25 Nov 2024 21:01:37 +0000
In preparation for allocating frozen pages, stop initialising the page
refcount in prep_new_page().
Link: https://lkml.kernel.org/r/20241125210149.2976098-6-willy@xxxxxxxxxxxxx
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Hyeonggon Yoo <42.hyeyoo@xxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxxx>
Cc: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Cc: Muchun Song <songmuchun@xxxxxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: William Kucharski <william.kucharski@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
--- a/mm/page_alloc.c~mm-page_alloc-move-set_page_refcounted-to-callers-of-prep_new_page
+++ a/mm/page_alloc.c
@@ -1561,7 +1561,6 @@ 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);
@@ -3472,6 +3471,7 @@ try_this_zone:
gfp_mask, alloc_flags, ac->migratetype);
if (page) {
prep_new_page(page, order, gfp_mask, alloc_flags);
+ set_page_refcounted(page);
/*
* If this is a high-order atomic allocation then check
@@ -3696,8 +3696,10 @@ __alloc_pages_direct_compact(gfp_t gfp_m
count_vm_event(COMPACTSTALL);
/* Prep a captured page if available */
- if (page)
+ if (page) {
prep_new_page(page, order, gfp_mask, alloc_flags);
+ set_page_refcounted(page);
+ }
/* Try get a page from the freelist if available */
if (!page)
@@ -4676,6 +4678,7 @@ retry_this_zone:
nr_account++;
prep_new_page(page, 0, gfp, 0);
+ set_page_refcounted(page);
if (page_list)
list_add(&page->lru, page_list);
else
@@ -6498,6 +6501,7 @@ int alloc_contig_range_noprof(unsigned l
check_new_pages(head, order);
prep_new_page(head, order, gfp_mask, 0);
+ set_page_refcounted(head);
} else {
ret = -EINVAL;
WARN(true, "PFN range: requested [%lu, %lu), allocated [%lu, %lu)\n",
_
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
