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mm/vmscan: Free non-shmem folios without splitting them

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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>
This commit is contained in:
Matthew Wilcox (Oracle) 2020-09-30 16:15:46 -04:00
parent 84fbbe2189
commit 820c4e2e6f
1 changed files with 2 additions and 2 deletions
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mm/vmscan.c
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@ -1739,8 +1739,8 @@ static unsigned int shrink_page_list(struct list_head *page_list,
/* Adding to swap updated mapping */
mapping = page_mapping(page);
}
} else if (unlikely(PageTransHuge(page))) {
/* Split file THP */
} else if (PageSwapBacked(page) && PageTransHuge(page)) {
/* Split shmem THP */
if (split_folio_to_list(folio, page_list))
goto keep_locked;
}