wb_min_ratio      770 mm/page-writeback.c 	unsigned long wb_min_ratio, wb_max_ratio;
wb_min_ratio      782 mm/page-writeback.c 	wb_min_max_ratio(dtc->wb, &wb_min_ratio, &wb_max_ratio);
wb_min_ratio      784 mm/page-writeback.c 	wb_thresh += (thresh * wb_min_ratio) / 100;