Commit 6237bcd9 authored Oct 29, 2005 by Hugh Dickins Committed by Linus Torvalds Oct 29, 2005

[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>

parent 0c942a45

mm/memory.c

+6 −4

Original line number	Diff line number	Diff line
		@@ -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))
		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);