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mm: debug_vm_pgtable: add debug_vm_pgtable_free_huge_page()

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Patch series "mm: hugetlb: allocate frozen gigantic folio", v6.

Introduce alloc_contig_frozen_pages() and cma_alloc_frozen_compound()
which avoid atomic operation about page refcount, and then convert to
allocate frozen gigantic folio by the new helpers in hugetlb to cleanup
the alloc_gigantic_folio().


This patch (of 6):

Add a new helper to free huge page to be consistency to
debug_vm_pgtable_alloc_huge_page(), and use HPAGE_PUD_ORDER instead of
open-code.

Also move the free_contig_range() under CONFIG_ALLOC_CONTIG since all
caller are built with CONFIG_ALLOC_CONTIG.

Link: https://lkml.kernel.org/r/20260109093136.1491549-2-wangkefeng.wang@huawei.com
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Acked-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Reviewed-by: Muchun Song <muchun.song@linux.dev>
Reviewed-by: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Cc: Brendan Jackman <jackmanb@google.com>
Cc: Jane Chu <jane.chu@oracle.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Cc: Mark Brown <broonie@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Kefeng Wang 2026-01-09 17:31:31 +08:00 • committed by Andrew Morton
parent 5747435e0f
commit 01152bd2e4
3 changed files with 19 additions and 23 deletions
Download patch file Download diff file Expand all files Collapse all files

2
include/linux/gfp.h
View file

@ -444,8 +444,8 @@ extern struct page *alloc_contig_pages_noprof(unsigned long nr_pages, gfp_t gfp_
int nid, nodemask_t *nodemask);
#define alloc_contig_pages(...) alloc_hooks(alloc_contig_pages_noprof(__VA_ARGS__))
#endif
void free_contig_range(unsigned long pfn, unsigned long nr_pages);
#endif
#ifdef CONFIG_CONTIG_ALLOC
static inline struct folio *folio_alloc_gigantic_noprof(int order, gfp_t gfp,

38
mm/debug_vm_pgtable.c
View file

@ -971,22 +971,26 @@ static unsigned long __init get_random_vaddr(void)
return random_vaddr;
}
static void __init
debug_vm_pgtable_free_huge_page(struct pgtable_debug_args *args,
unsigned long pfn, int order)
{
#ifdef CONFIG_CONTIG_ALLOC
if (args->is_contiguous_page) {
free_contig_range(pfn, 1 << order);
return;
}
#endif
__free_pages(pfn_to_page(pfn), order);
}
static void __init destroy_args(struct pgtable_debug_args *args)
{
struct page *page = NULL;
/* Free (huge) page */
if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE) &&
has_transparent_pud_hugepage() &&
args->pud_pfn != ULONG_MAX) {
if (args->is_contiguous_page) {
free_contig_range(args->pud_pfn,
(1 << (HPAGE_PUD_SHIFT - PAGE_SHIFT)));
} else {
page = pfn_to_page(args->pud_pfn);
__free_pages(page, HPAGE_PUD_SHIFT - PAGE_SHIFT);
}
debug_vm_pgtable_free_huge_page(args, args->pud_pfn, HPAGE_PUD_ORDER);
args->pud_pfn = ULONG_MAX;
args->pmd_pfn = ULONG_MAX;
args->pte_pfn = ULONG_MAX;
@ -995,20 +999,13 @@ static void __init destroy_args(struct pgtable_debug_args *args)
if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE) &&
has_transparent_hugepage() &&
args->pmd_pfn != ULONG_MAX) {
if (args->is_contiguous_page) {
free_contig_range(args->pmd_pfn, (1 << HPAGE_PMD_ORDER));
} else {
page = pfn_to_page(args->pmd_pfn);
__free_pages(page, HPAGE_PMD_ORDER);
}
debug_vm_pgtable_free_huge_page(args, args->pmd_pfn, HPAGE_PMD_ORDER);
args->pmd_pfn = ULONG_MAX;
args->pte_pfn = ULONG_MAX;
}
if (args->pte_pfn != ULONG_MAX) {
page = pfn_to_page(args->pte_pfn);
__free_page(page);
__free_page(pfn_to_page(args->pte_pfn));
args->pte_pfn = ULONG_MAX;
}
@ -1242,8 +1239,7 @@ static int __init init_args(struct pgtable_debug_args *args)
*/
if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE) &&
has_transparent_pud_hugepage()) {
page = debug_vm_pgtable_alloc_huge_page(args,
HPAGE_PUD_SHIFT - PAGE_SHIFT);
page = debug_vm_pgtable_alloc_huge_page(args, HPAGE_PUD_ORDER);
if (page) {
args->pud_pfn = page_to_pfn(page);
args->pmd_pfn = args->pud_pfn;

2
mm/page_alloc.c
View file

@ -7255,7 +7255,6 @@ retry:
}
return NULL;
}
#endif /* CONFIG_CONTIG_ALLOC */
void free_contig_range(unsigned long pfn, unsigned long nr_pages)
{
@ -7282,6 +7281,7 @@ void free_contig_range(unsigned long pfn, unsigned long nr_pages)
WARN(count != 0, "%lu pages are still in use!\n", count);
}
EXPORT_SYMBOL(free_contig_range);
#endif /* CONFIG_CONTIG_ALLOC */
/*
* Effectively disable pcplists for the zone by setting the high limit to 0