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thp: ksm: free swap when swapcache page is replaced

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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>
This commit is contained in:
Hugh Dickins 2011-01-13 15:46:28 -08:00 committed by Linus Torvalds
parent 240c879f20
commit ae52a2adb5
1 changed files with 2 additions and 0 deletions
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2
mm/ksm.c
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@ -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)); set_pte_at_notify(mm, addr, ptep, mk_pte(kpage, vma->vm_page_prot));
page_remove_rmap(page); page_remove_rmap(page);
if (!page_mapped(page))
try_to_free_swap(page);
put_page(page); put_page(page);
pte_unmap_unlock(ptep, ptl); pte_unmap_unlock(ptep, ptl);