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Subject[PATCH 04/21] 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 <hugh@veritas.com>
---
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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