From 6237bcd94851e9cf0ecd2520d744779df0f5a9a6 Mon Sep 17 00:00:00 2001 From: Hugh Dickins Date: Sat, 29 Oct 2005 18:15:54 -0700 Subject: [PATCH] [PATCH] mm: zap_pte_range dont dirty anon zap_pte_range already avoids wasting time to mark_page_accessed on anon pages: it can also skip anon set_page_dirty - the page only needs to be marked dirty if shared with another mm, but that will say pte_dirty too. Signed-off-by: Hugh Dickins Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/memory.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/mm/memory.c b/mm/memory.c index 222c13e46130..fd5d4c6dc762 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -574,12 +574,14 @@ static void zap_pte_range(struct mmu_gather *tlb, pmd_t *pmd, addr) != page->index) set_pte_at(tlb->mm, addr, pte, pgoff_to_pte(page->index)); - if (pte_dirty(ptent)) - set_page_dirty(page); if (PageAnon(page)) dec_mm_counter(tlb->mm, anon_rss); - else if (pte_young(ptent)) - mark_page_accessed(page); + else { + if (pte_dirty(ptent)) + set_page_dirty(page); + if (pte_young(ptent)) + mark_page_accessed(page); + } tlb->freed++; page_remove_rmap(page); tlb_remove_page(tlb, page); -- 2.30.2