bg_ratio          401 mm/page-writeback.c 	unsigned long bg_ratio = (dirty_background_ratio * PAGE_SIZE) / 100;
bg_ratio          421 mm/page-writeback.c 			bg_ratio = min(DIV_ROUND_UP(bg_bytes, global_avail),
bg_ratio          434 mm/page-writeback.c 		bg_thresh = (bg_ratio * available_memory) / PAGE_SIZE;