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mm/vmscan: Free non-shmem folios without splitting them
We have to allocate memory in order to split a file-backed folio, so it's not a good idea to split them in the memory freeing path. It also doesn't work for XFS because pages have an extra reference count from page_has_private() and split_huge_page() expects that reference to have already been removed. Unfortunately, we still have to split shmem THPs because we can't handle swapping out an entire THP yet. Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
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@ -1739,8 +1739,8 @@ static unsigned int shrink_page_list(struct list_head *page_list,
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/* Adding to swap updated mapping */
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mapping = page_mapping(page);
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}
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} else if (unlikely(PageTransHuge(page))) {
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/* Split file THP */
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} else if (PageSwapBacked(page) && PageTransHuge(page)) {
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/* Split shmem THP */
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if (split_folio_to_list(folio, page_list))
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goto keep_locked;
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}
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