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mm: Add split_folio_to_list()

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This is a convenience function; split_huge_page_to_list() can take
any page in a folio (and does so on purpose because that page will
be the one which keeps the refcount).  But it's convenient for the
callers to pass the folio instead of the first page in the folio.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Matthew Wilcox (Oracle) 2022-01-18 08:56:47 -05:00
parent 4ba1119cd5
commit 346cf61311
2 changed files with 11 additions and 5 deletions
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6
include/linux/huge_mm.h
View File

@ -483,6 +483,12 @@ static inline bool thp_migration_supported(void)
}
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
static inline int split_folio_to_list(struct folio *folio,
struct list_head *list)
{
return split_huge_page_to_list(&folio->page, list);
}
/**
* thp_size - Size of a transparent huge page.
* @page: Head page of a transparent huge page.

10
mm/vmscan.c
View File

@ -1715,16 +1715,16 @@ retry:
* tail pages can be freed without IO.
*/
if (!compound_mapcount(page) &&
split_huge_page_to_list(page,
page_list))
split_folio_to_list(folio,
page_list))
goto activate_locked;
}
if (!add_to_swap(page)) {
if (!PageTransHuge(page))
goto activate_locked_split;
/* Fallback to swap normal pages */
if (split_huge_page_to_list(page,
page_list))
if (split_folio_to_list(folio,
page_list))
goto activate_locked;
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
count_vm_event(THP_SWPOUT_FALLBACK);
@ -1740,7 +1740,7 @@ retry:
}
} else if (unlikely(PageTransHuge(page))) {
/* Split file THP */
if (split_huge_page_to_list(page, page_list))
if (split_folio_to_list(folio, page_list))
goto keep_locked;
}