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mm: convert deferred_split_huge_page() to deferred_split_folio() 

Now that both callers use a folio, pass the folio in and save a call to
compound_head().

Link: https://lkml.kernel.org/r/20230111142915.1001531-28-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2023-01-11 14:29:13 +00:00 committed by Andrew Morton
parent f8baa6be03
commit f158ed6195
4 changed files with 7 additions and 8 deletions
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6
Documentation/mm/transhuge.rst
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@ -153,8 +153,8 @@ clear where references should go after split: it will stay on the head page.
Note that split_huge_pmd() doesn't have any limitations on refcounting: Note that split_huge_pmd() doesn't have any limitations on refcounting:
pmd can be split at any point and never fails. pmd can be split at any point and never fails.
Partial unmap and deferred_split_huge_page() Partial unmap and deferred_split_folio()
============================================ ========================================
Unmapping part of THP (with munmap() or other way) is not going to free Unmapping part of THP (with munmap() or other way) is not going to free
memory immediately. Instead, we detect that a subpage of THP is not in use memory immediately. Instead, we detect that a subpage of THP is not in use
@ -166,6 +166,6 @@ the place where we can detect partial unmap. It also might be
counterproductive since in many cases partial unmap happens during exit(2) if counterproductive since in many cases partial unmap happens during exit(2) if
a THP crosses a VMA boundary. a THP crosses a VMA boundary.
The function deferred_split_huge_page() is used to queue a page for splitting. The function deferred_split_folio() is used to queue a folio for splitting.
The splitting itself will happen when we get memory pressure via shrinker The splitting itself will happen when we get memory pressure via shrinker
interface. interface.

4
include/linux/huge_mm.h
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@ -187,7 +187,7 @@ static inline int split_huge_page(struct page *page)
{ {
return split_huge_page_to_list(page, NULL); return split_huge_page_to_list(page, NULL);
} }
void deferred_split_huge_page(struct page *page); void deferred_split_folio(struct folio *folio);
void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd, void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
unsigned long address, bool freeze, struct folio *folio); unsigned long address, bool freeze, struct folio *folio);
@ -340,7 +340,7 @@ static inline int split_huge_page(struct page *page)
{ {
return 0; return 0;
} }
static inline void deferred_split_huge_page(struct page *page) {} static inline void deferred_split_folio(struct folio *folio) {}
#define split_huge_pmd(__vma, __pmd, __address) \ #define split_huge_pmd(__vma, __pmd, __address) \
do { } while (0) do { } while (0)

3
mm/huge_memory.c
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@ -2815,9 +2815,8 @@ void free_transhuge_page(struct page *page)
free_compound_page(page); free_compound_page(page);
} }
void deferred_split_huge_page(struct page *page) void deferred_split_folio(struct folio *folio)
{ {
struct folio *folio = page_folio(page);
struct deferred_split *ds_queue = get_deferred_split_queue(folio); struct deferred_split *ds_queue = get_deferred_split_queue(folio);
#ifdef CONFIG_MEMCG #ifdef CONFIG_MEMCG
struct mem_cgroup *memcg = folio_memcg(folio); struct mem_cgroup *memcg = folio_memcg(folio);

2
mm/rmap.c
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@ -1427,7 +1427,7 @@ void page_remove_rmap(struct page *page, struct vm_area_struct *vma,
*/ */
if (folio_test_pmd_mappable(folio) && folio_test_anon(folio)) if (folio_test_pmd_mappable(folio) && folio_test_anon(folio))
if (!compound || nr < nr_pmdmapped) if (!compound || nr < nr_pmdmapped)
deferred_split_huge_page(&folio->page); deferred_split_folio(folio);
} }
/* /*