The patch titled
Subject: mm: page_isolation: handle unaccepted memory isolation
has been added to the -mm mm-unstable branch. Its filename is
mm-page_isolation-handle-unaccepted-memory-isolation.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-page_isolation-handle-unaccepted-memory-isolation.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: page_isolation: handle unaccepted memory isolation
Date: Fri, 9 Aug 2024 14:48:53 +0300
Page isolation machinery doesn't know anything about unaccepted memory and
considers it non-free. It leads to alloc_contig_pages() failure.
Treat unaccepted memory as free and accept memory on pageblock isolation.
Once memory is accepted it becomes PageBuddy() and page isolation knows
how to deal with them.
Link: https://lkml.kernel.org/r/20240809114854.3745464-8-kirill.shutemov@xxxxxxxxxxxxxxx
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
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>
---
mm/page_isolation.c | 8 ++++++++
1 file changed, 8 insertions(+)
--- a/mm/page_isolation.c~mm-page_isolation-handle-unaccepted-memory-isolation
+++ a/mm/page_isolation.c
@@ -152,6 +152,9 @@ static int set_migratetype_isolate(struc
unsigned long flags;
unsigned long check_unmovable_start, check_unmovable_end;
+ if (PageUnaccepted(page))
+ accept_page(page);
+
spin_lock_irqsave(&zone->lock, flags);
/*
@@ -367,6 +370,11 @@ static int isolate_single_pageblock(unsi
VM_BUG_ON(!page);
pfn = page_to_pfn(page);
+ if (PageUnaccepted(page)) {
+ pfn += MAX_ORDER_NR_PAGES;
+ continue;
+ }
+
if (PageBuddy(page)) {
int order = buddy_order(page);
_
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
