The patch titled
Subject: mm/hugetlb: use folio->lru int demote_free_hugetlb_folios()
has been added to the -mm mm-unstable branch. Its filename is
mm-hugetlb-use-folio-lru-int-demote_free_hugetlb_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-use-folio-lru-int-demote_free_hugetlb_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: David Hildenbrand <david@xxxxxxxxxx>
Subject: mm/hugetlb: use folio->lru int demote_free_hugetlb_folios()
Date: Mon, 13 Jan 2025 14:16:11 +0100
We are demoting hugetlb folios to smaller hugetlb folios; let's avoid
messing with pages where avoidable and handle it more similar to
__split_huge_page_tail().
Link: https://lkml.kernel.org/r/20250113131611.2554758-7-david@xxxxxxxxxx
Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>
Reviewed-by: Sidhartha Kumar <sidhartha.kumar@xxxxxxxxxx>
Cc: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>
Cc: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Cc: Muchun Song <muchun.song@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/hugetlb.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
--- a/mm/hugetlb.c~mm-hugetlb-use-folio-lru-int-demote_free_hugetlb_folios
+++ a/mm/hugetlb.c
@@ -3826,13 +3826,15 @@ static long demote_free_hugetlb_folios(s
for (i = 0; i < pages_per_huge_page(src); i += pages_per_huge_page(dst)) {
struct page *page = folio_page(folio, i);
+ /* Careful: see __split_huge_page_tail() */
+ struct folio *new_folio = (struct folio *)page;
- page->mapping = NULL;
clear_compound_head(page);
prep_compound_page(page, dst->order);
- init_new_hugetlb_folio(dst, page_folio(page));
- list_add(&page->lru, &dst_list);
+ new_folio->mapping = NULL;
+ init_new_hugetlb_folio(dst, new_folio);
+ list_add(&new_folio->lru, &dst_list);
}
}
_
Patches currently in -mm which might be from david@xxxxxxxxxx are
docs-tmpfs-update-the-large-folios-policy-for-tmpfs-and-shmem.patch
mm-memory_hotplug-move-debug_pagealloc_map_pages-into-online_pages_range.patch
mm-page_isolation-dont-pass-gfp-flags-to-isolate_single_pageblock.patch
mm-page_isolation-dont-pass-gfp-flags-to-start_isolate_page_range.patch
mm-page_alloc-make-__alloc_contig_migrate_range-static.patch
mm-page_alloc-sort-out-the-alloc_contig_range-gfp-flags-mess.patch
mm-page_alloc-forward-the-gfp-flags-from-alloc_contig_range-to-post_alloc_hook.patch
powernv-memtrace-use-__gfp_zero-with-alloc_contig_pages.patch
mm-hugetlb-dont-map-folios-writable-without-vm_write-when-copying-during-fork.patch
mm-page_alloc-dont-use-__gfp_hardwall-when-migrating-pages-via-alloc_contig.patch
mm-memory_hotplug-dont-use-__gfp_hardwall-when-migrating-pages-via-memory-offlining.patch
mm-huge_memory-convert-has_hwpoisoned-into-a-pure-folio-flag.patch
mm-hugetlb-rename-isolate_hugetlb-to-folio_isolate_hugetlb.patch
mm-migrate-dont-call-folio_putback_active_hugetlb-on-dst-hugetlb-folio.patch
mm-hugetlb-rename-folio_putback_active_hugetlb-to-folio_putback_hugetlb.patch
mm-hugetlb-cgroup-convert-hugetlb_cgroup_css_offline-to-work-on-folios.patch
mm-hugetlb-use-folio-lru-int-demote_free_hugetlb_folios.patch
