The patch titled
Subject: mm: introduce PageUnaccepted() page type
has been added to the -mm mm-unstable branch. Its filename is
mm-introduce-pageunaccepted-page-type.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-introduce-pageunaccepted-page-type.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: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Subject: mm: introduce PageUnaccepted() page type
Date: Fri, 9 Aug 2024 14:48:50 +0300
The new page type allows physical memory scanners to detect unaccepted
memory and handle it accordingly.
The page type is serialized with zone lock.
Link: https://lkml.kernel.org/r/20240809114854.3745464-5-kirill.shutemov@xxxxxxxxxxxxxxx
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Acked-by: David Hildenbrand <david@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxx>
Cc: Mike Rapoport (Microsoft) <rppt@xxxxxxxxxx>
Cc: Tom Lendacky <thomas.lendacky@xxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/page-flags.h | 8 ++++++++
mm/page_alloc.c | 2 ++
2 files changed, 10 insertions(+)
--- a/include/linux/page-flags.h~mm-introduce-pageunaccepted-page-type
+++ a/include/linux/page-flags.h
@@ -939,6 +939,7 @@ enum pagetype {
PG_hugetlb = 0x04000000,
PG_slab = 0x02000000,
PG_zsmalloc = 0x01000000,
+ PG_unaccepted = 0x00800000,
PAGE_TYPE_BASE = 0x80000000,
@@ -1072,6 +1073,13 @@ FOLIO_TEST_FLAG_FALSE(hugetlb)
PAGE_TYPE_OPS(Zsmalloc, zsmalloc, zsmalloc)
+/*
+ * Mark pages that has to be accepted before touched for the first time.
+ *
+ * Serialized with zone lock.
+ */
+PAGE_TYPE_OPS(Unaccepted, unaccepted, unaccepted)
+
/**
* PageHuge - Determine if the page belongs to hugetlbfs
* @page: The page to test.
--- a/mm/page_alloc.c~mm-introduce-pageunaccepted-page-type
+++ a/mm/page_alloc.c
@@ -6972,6 +6972,7 @@ static bool try_to_accept_memory_one(str
account_freepages(zone, -MAX_ORDER_NR_PAGES, MIGRATE_MOVABLE);
__mod_zone_page_state(zone, NR_UNACCEPTED, -MAX_ORDER_NR_PAGES);
+ __ClearPageUnaccepted(page);
spin_unlock_irqrestore(&zone->lock, flags);
accept_page(page, MAX_PAGE_ORDER);
@@ -7030,6 +7031,7 @@ static bool __free_unaccepted(struct pag
list_add_tail(&page->lru, &zone->unaccepted_pages);
account_freepages(zone, MAX_ORDER_NR_PAGES, MIGRATE_MOVABLE);
__mod_zone_page_state(zone, NR_UNACCEPTED, MAX_ORDER_NR_PAGES);
+ __SetPageUnaccepted(page);
spin_unlock_irqrestore(&zone->lock, flags);
if (first)
_
Patches currently in -mm which might be from kirill.shutemov@xxxxxxxxxxxxxxx are
mm-fix-endless-reclaim-on-machines-with-unaccepted-memory.patch
mm-reduce-deferred-struct-page-init-ifdeffery.patch
mm-accept-memory-in-__alloc_pages_bulk.patch
mm-introduce-pageunaccepted-page-type.patch
mm-rework-accept-memory-helpers.patch
mm-add-a-helper-to-accept-page.patch
mm-page_isolation-handle-unaccepted-memory-isolation.patch
mm-accept-to-promo-watermark.patch
