Commit 6237bcd9 authored by Hugh Dickins's avatar Hugh Dickins Committed by Linus Torvalds
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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: default avatarHugh Dickins <hugh@veritas.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 0c942a45
......@@ -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);
......
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