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authorHugh Dickins <hugh@veritas.com>2005-10-29 18:15:54 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2005-10-29 21:40:36 -0700
commit6237bcd94851e9cf0ecd2520d744779df0f5a9a6 (patch)
tree5f34366cd527382489bd0bebbac8d39d59f1d5db /mm/memory.c
parent0c942a4539c09adf09097315cc174aefd0eeedf7 (diff)
downloadlwn-6237bcd94851e9cf0ecd2520d744779df0f5a9a6.tar.gz
lwn-6237bcd94851e9cf0ecd2520d744779df0f5a9a6.zip
[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 <hugh@veritas.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm/memory.c')
-rw-r--r--mm/memory.c10
1 files 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);