[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>
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0c942a4539
Коммит
6237bcd948
10
mm/memory.c
10
mm/memory.c
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@ -574,12 +574,14 @@ static void zap_pte_range(struct mmu_gather *tlb, pmd_t *pmd,
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addr) != page->index)
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set_pte_at(tlb->mm, addr, pte,
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pgoff_to_pte(page->index));
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if (pte_dirty(ptent))
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set_page_dirty(page);
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if (PageAnon(page))
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dec_mm_counter(tlb->mm, anon_rss);
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else if (pte_young(ptent))
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mark_page_accessed(page);
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else {
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if (pte_dirty(ptent))
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set_page_dirty(page);
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if (pte_young(ptent))
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mark_page_accessed(page);
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}
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tlb->freed++;
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page_remove_rmap(page);
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tlb_remove_page(tlb, page);
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