blkcg_clear_delay 1234 block/blk-iocost.c 		blkcg_clear_delay(blkg);
blkcg_clear_delay  451 block/blk-iolatency.c 		blkcg_clear_delay(lat_to_blkg(iolat));
blkcg_clear_delay  763 block/blk-iolatency.c 		blkcg_clear_delay(blkg);