thp: ksm: free swap when swapcache page is replaced
When a swapcache page is replaced by a ksm page, it's best to free that swap immediately. Reported-by: Andrea Arcangeli <aarcange@redhat.com> Signed-off-by: Hugh Dickins <hughd@google.com> Signed-off-by: Andrea Arcangeli <aarcange@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>hifive-unleashed-5.1
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mm/ksm.c
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mm/ksm.c
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@ -800,6 +800,8 @@ static int replace_page(struct vm_area_struct *vma, struct page *page,
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set_pte_at_notify(mm, addr, ptep, mk_pte(kpage, vma->vm_page_prot));
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set_pte_at_notify(mm, addr, ptep, mk_pte(kpage, vma->vm_page_prot));
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page_remove_rmap(page);
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page_remove_rmap(page);
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if (!page_mapped(page))
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try_to_free_swap(page);
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put_page(page);
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put_page(page);
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pte_unmap_unlock(ptep, ptl);
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pte_unmap_unlock(ptep, ptl);
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