The patch titled
Subject: khugepaged: remove hpage from collapse_huge_page()
has been added to the -mm mm-unstable branch. Its filename is
khugepaged-remove-hpage-from-collapse_huge_page.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/khugepaged-remove-hpage-from-collapse_huge_page.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: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>
Subject: khugepaged: remove hpage from collapse_huge_page()
Date: Wed, 3 Apr 2024 18:18:32 +0100
Work purely in terms of the folio. Removes a call to compound_head()
in put_page().
Link: https://lkml.kernel.org/r/20240403171838.1445826-4-willy@xxxxxxxxxxxxx
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/khugepaged.c | 12 +++++-------
1 file changed, 5 insertions(+), 7 deletions(-)
--- a/mm/khugepaged.c~khugepaged-remove-hpage-from-collapse_huge_page
+++ a/mm/khugepaged.c
@@ -1082,7 +1082,6 @@ static int collapse_huge_page(struct mm_
pte_t *pte;
pgtable_t pgtable;
struct folio *folio;
- struct page *hpage;
spinlock_t *pmd_ptl, *pte_ptl;
int result = SCAN_FAIL;
struct vm_area_struct *vma;
@@ -1099,7 +1098,6 @@ static int collapse_huge_page(struct mm_
mmap_read_unlock(mm);
result = alloc_charge_folio(&folio, mm, cc);
- hpage = &folio->page;
if (result != SCAN_SUCCEED)
goto out_nolock;
@@ -1198,7 +1196,7 @@ static int collapse_huge_page(struct mm_
*/
anon_vma_unlock_write(vma->anon_vma);
- result = __collapse_huge_page_copy(pte, hpage, pmd, _pmd,
+ result = __collapse_huge_page_copy(pte, &folio->page, pmd, _pmd,
vma, address, pte_ptl,
&compound_pagelist);
pte_unmap(pte);
@@ -1213,7 +1211,7 @@ static int collapse_huge_page(struct mm_
__folio_mark_uptodate(folio);
pgtable = pmd_pgtable(_pmd);
- _pmd = mk_huge_pmd(hpage, vma->vm_page_prot);
+ _pmd = mk_huge_pmd(&folio->page, vma->vm_page_prot);
_pmd = maybe_pmd_mkwrite(pmd_mkdirty(_pmd), vma);
spin_lock(pmd_ptl);
@@ -1225,14 +1223,14 @@ static int collapse_huge_page(struct mm_
update_mmu_cache_pmd(vma, address, pmd);
spin_unlock(pmd_ptl);
- hpage = NULL;
+ folio = NULL;
result = SCAN_SUCCEED;
out_up_write:
mmap_write_unlock(mm);
out_nolock:
- if (hpage)
- put_page(hpage);
+ if (folio)
+ folio_put(folio);
trace_mm_collapse_huge_page(mm, result == SCAN_SUCCEED, result);
return result;
}
_
Patches currently in -mm which might be from willy@xxxxxxxxxxxxx are
mm-always-initialise-folio-_deferred_list.patch
mm-create-folio_flag_false-and-folio_type_ops-macros.patch
mm-remove-folio_prep_large_rmappable.patch
mm-support-page_mapcount-on-page_has_type-pages.patch
mm-turn-folio_test_hugetlb-into-a-pagetype.patch
mm-turn-folio_test_hugetlb-into-a-pagetype-fix.patch
mm-remove-a-call-to-compound_head-from-is_page_hwpoison.patch
mm-free-up-pg_slab.patch
mm-free-up-pg_slab-fix.patch
mm-improve-dumping-of-mapcount-and-page_type.patch
hugetlb-remove-mention-of-destructors.patch
sh-remove-use-of-pg_arch_1-on-individual-pages.patch
xtensa-remove-uses-of-pg_arch_1-on-individual-pages.patch
mm-make-page_ext_get-take-a-const-argument.patch
mm-make-folio_test_idle-and-folio_test_young-take-a-const-argument.patch
mm-make-is_free_buddy_page-take-a-const-argument.patch
mm-make-page_mapped-take-a-const-argument.patch
mm-convert-arch_clear_hugepage_flags-to-take-a-folio.patch
mm-convert-arch_clear_hugepage_flags-to-take-a-folio-fix.patch
slub-remove-use-of-page-flags.patch
remove-references-to-page-flags-in-documentation.patch
proc-rewrite-stable_page_flags.patch
proc-rewrite-stable_page_flags-fix.patch
sparc-use-is_huge_zero_pmd.patch
mm-add-is_huge_zero_folio.patch
mm-add-pmd_folio.patch
mm-convert-migrate_vma_collect_pmd-to-use-a-folio.patch
mm-convert-huge_zero_page-to-huge_zero_folio.patch
mm-convert-do_huge_pmd_anonymous_page-to-huge_zero_folio.patch
dax-use-huge_zero_folio.patch
mm-rename-mm_put_huge_zero_page-to-mm_put_huge_zero_folio.patch
mm-use-rwsem-assertion-macros-for-mmap_lock.patch
filemap-remove-__set_page_dirty.patch
mm-correct-page_mapped_in_vma-for-large-folios.patch
mm-remove-vma_address.patch
mm-rename-vma_pgoff_address-back-to-vma_address.patch
khugepaged-inline-hpage_collapse_alloc_folio.patch
khugepaged-convert-alloc_charge_hpage-to-alloc_charge_folio.patch
khugepaged-remove-hpage-from-collapse_huge_page.patch
khugepaged-pass-a-folio-to-__collapse_huge_page_copy.patch
khugepaged-remove-hpage-from-collapse_file.patch
khugepaged-use-a-folio-throughout-collapse_file.patch
khugepaged-use-a-folio-throughout-hpage_collapse_scan_file.patch
