Commit ae52a2ad authored Jan 13, 2011 by Hugh Dickins Committed by Linus Torvalds Jan 13, 2011

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>

parent 240c879f

mm/ksm.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -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);