[PATCH 04/21] mm: zap_pte_range dont dirty anon

[Hugh Dickins]

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 <hugh@xxxxxxxxxxx>
---

 mm/memory.c |   10 ++++++----
 1 files changed, 6 insertions(+), 4 deletions(-)

--- mm03/mm/memory.c	2005-09-24 19:26:38.000000000 +0100
+++ mm04/mm/memory.c	2005-09-24 19:27:05.000000000 +0100
@@ -574,12 +574,14 @@ static void zap_pte_range(struct mmu_gat
 						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);
-
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