[PATCH] mm: hugetlb: bail out unmapping after serving reference page

[Hillf Danton]

When unmapping given VM range, we could bail out if a reference page is
supplied and it is unmapped, which is a minor optimization.

Signed-off-by: Hillf Danton <dhillf@xxxxxxxxx>
---

--- a/mm/hugetlb.c	Wed Feb 22 19:34:12 2012
+++ b/mm/hugetlb.c	Wed Feb 22 19:50:26 2012
@@ -2280,6 +2280,9 @@ void __unmap_hugepage_range(struct vm_ar
 		if (pte_dirty(pte))
 			set_page_dirty(page);
 		list_add(&page->lru, &page_list);
+
+		if (page == ref_page)
+			break;
 	}
 	spin_unlock(&mm->page_table_lock);
 	flush_tlb_range(vma, start, end);
--
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/