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[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>
This commit is contained in:
Hugh Dickins 2005-10-29 18:15:54 -07:00 committed by Linus Torvalds
parent 0c942a4539
commit 6237bcd948
1 changed files with 6 additions and 4 deletions
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10
mm/memory.c
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@ -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);