From ae52a2adb5afa5ac5ec5fb5c7b24777f84b6c926 Mon Sep 17 00:00:00 2001 From: Hugh Dickins Date: Thu, 13 Jan 2011 15:46:28 -0800 Subject: [PATCH] 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 Signed-off-by: Hugh Dickins Signed-off-by: Andrea Arcangeli Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/ksm.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/mm/ksm.c b/mm/ksm.c index 43bc893..b5b907c 100644 --- a/mm/ksm.c +++ b/mm/ksm.c @@ -800,6 +800,8 @@ static int replace_page(struct vm_area_struct *vma, struct page *page, set_pte_at_notify(mm, addr, ptep, mk_pte(kpage, vma->vm_page_prot)); page_remove_rmap(page); + if (!page_mapped(page)) + try_to_free_swap(page); put_page(page); pte_unmap_unlock(ptep, ptl); -- 2.7.4