shmem: Convert shmem_partial_swap_usage to XArray (7ae3424f) · Commits · 戴 / test

mm/shmem.c

+4 −14

Original line number	Diff line number	Diff line
		@@ -676,29 +676,19 @@ static int shmem_free_swap(struct address_space *mapping,
		unsigned long shmem_partial_swap_usage(struct address_space *mapping,
		pgoff_t start, pgoff_t end)
		{
		struct radix_tree_iter iter;
		void __rcu **slot;
		XA_STATE(xas, &mapping->i_pages, start);
		struct page *page;
		unsigned long swapped = 0;

		rcu_read_lock();

		radix_tree_for_each_slot(slot, &mapping->i_pages, &iter, start) {
		if (iter.index >= end)
		break;

		page = radix_tree_deref_slot(slot);

		if (radix_tree_deref_retry(page)) {
		slot = radix_tree_iter_retry(&iter);
		xas_for_each(&xas, page, end - 1) {
		if (xas_retry(&xas, page))
		continue;
		}

		if (xa_is_value(page))
		swapped++;

		if (need_resched()) {
		slot = radix_tree_iter_resume(slot, &iter);
		xas_pause(&xas);
		cond_resched_rcu();
		}
		}