nr_swap           572 mm/madvise.c   	int nr_swap = 0;
nr_swap           603 mm/madvise.c   			nr_swap--;
nr_swap           682 mm/madvise.c   	if (nr_swap) {
nr_swap           686 mm/madvise.c   		add_mm_counter(mm, MM_SWAPENTS, nr_swap);