+ mm-hugetlb-set-migratetype-for-bootmem-folios.patch added to mm-unstable branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: mm/hugetlb: set migratetype for bootmem folios
has been added to the -mm mm-unstable branch.  Its filename is
     mm-hugetlb-set-migratetype-for-bootmem-folios.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-hugetlb-set-migratetype-for-bootmem-folios.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: Frank van der Linden <fvdl@google.com>
Subject: mm/hugetlb: set migratetype for bootmem folios
Date: Thu, 6 Feb 2025 18:50:52 +0000

The pageblocks that back memblock allocated hugetlb folios might not have
the migrate type set, in the CONFIG_DEFERRED_STRUCT_PAGE_INIT case.

memblock allocated hugetlb folios might be given to the buddy allocator
eventually (if nr_hugepages is lowered), so make sure that the migrate
type for the pageblocks contained in them is set when initializing them. 
Set it to the default that memmap init also uses (MIGRATE_MOVABLE).

Link: https://lkml.kernel.org/r/20250206185109.1210657-13-fvdl@google.com
Signed-off-by: Frank van der Linden <fvdl@google.com>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Joao Martins <joao.m.martins@oracle.com>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Roman Gushchin (Cruise) <roman.gushchin@linux.dev>
Cc: Usama Arif <usamaarif642@gmail.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Yu Zhao <yuzhao@google.com>
Cc: Zhenguo Yao <yaozhenguo1@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/hugetlb.c |   21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

--- a/mm/hugetlb.c~mm-hugetlb-set-migratetype-for-bootmem-folios
+++ a/mm/hugetlb.c
@@ -3258,6 +3258,26 @@ static void __init hugetlb_folio_init_vm
 	prep_compound_head((struct page *)folio, huge_page_order(h));
 }
 
+/*
+ * memblock-allocated pageblocks might not have the migrate type set
+ * if marked with the 'noinit' flag. Set it to the default (MIGRATE_MOVABLE)
+ * here.
+ *
+ * Note that this will not write the page struct, it is ok (and necessary)
+ * to do this on vmemmap optimized folios.
+ */
+static void __init hugetlb_bootmem_init_migratetype(struct folio *folio,
+							  struct hstate *h)
+{
+	unsigned long nr_pages = pages_per_huge_page(h), i;
+
+	WARN_ON_ONCE(!pageblock_aligned(folio_pfn(folio)));
+
+	for (i = 0; i < nr_pages; i += pageblock_nr_pages)
+		set_pageblock_migratetype(folio_page(folio, i),
+					  MIGRATE_MOVABLE);
+}
+
 static void __init prep_and_add_bootmem_folios(struct hstate *h,
 					struct list_head *folio_list)
 {
@@ -3279,6 +3299,7 @@ static void __init prep_and_add_bootmem_
 					HUGETLB_VMEMMAP_RESERVE_PAGES,
 					pages_per_huge_page(h));
 		}
+		hugetlb_bootmem_init_migratetype(folio, h);
 		/* Subdivide locks to achieve better parallel performance */
 		spin_lock_irqsave(&hugetlb_lock, flags);
 		__prep_account_new_huge_page(h, folio_nid(folio));
_

Patches currently in -mm which might be from fvdl@google.com are

mm-cma-export-total-and-free-number-of-pages-for-cma-areas.patch
mm-cma-support-multiple-contiguous-ranges-if-requested.patch
mm-cma-introduce-cma_intersects-function.patch
mm-hugetlb-use-cma_declare_contiguous_multi.patch
mm-hugetlb-fix-round-robin-bootmem-allocation.patch
mm-hugetlb-remove-redundant-__clearpagereserved.patch
mm-hugetlb-use-online-nodes-for-bootmem-allocation.patch
mm-hugetlb-convert-cmdline-parameters-from-setup-to-early.patch
x86-mm-make-register_page_bootmem_memmap-handle-pte-mappings.patch
mm-bootmem_info-export-register_page_bootmem_memmap.patch
mm-sparse-allow-for-alternate-vmemmap-section-init-at-boot.patch
mm-hugetlb-set-migratetype-for-bootmem-folios.patch
mm-define-__init_reserved_page_zone-function.patch
mm-hugetlb-check-bootmem-pages-for-zone-intersections.patch
mm-sparse-add-vmemmap__hvo-functions.patch
mm-hugetlb-deal-with-multiple-calls-to-hugetlb_bootmem_alloc.patch
mm-hugetlb-move-huge_boot_pages-list-init-to-hugetlb_bootmem_alloc.patch
mm-hugetlb-add-pre-hvo-framework.patch
mm-hugetlb_vmemmap-fix-hugetlb_vmemmap_restore_folios-definition.patch
mm-hugetlb-do-pre-hvo-for-bootmem-allocated-pages.patch
x86-setup-call-hugetlb_bootmem_alloc-early.patch
x86-mm-set-arch_want_sparsemem_vmemmap_preinit.patch
mm-cma-simplify-zone-intersection-check.patch
mm-cma-introduce-a-cma-validate-function.patch
mm-cma-introduce-interface-for-early-reservations.patch
mm-hugetlb-add-hugetlb_cma_only-cmdline-option.patch
mm-hugetlb-enable-bootmem-allocation-from-cma-areas.patch
mm-hugetlb-move-hugetlb-cma-code-in-to-its-own-file.patch