VMSCAN_THROTTLE_WRITEBACK
#define _VMSCAN_THROTTLE_WRITEBACK (1 << VMSCAN_THROTTLE_WRITEBACK)
VMSCAN_THROTTLE_WRITEBACK);
reclaim_throttle(pgdat, VMSCAN_THROTTLE_WRITEBACK);
case VMSCAN_THROTTLE_WRITEBACK:
if (reason == VMSCAN_THROTTLE_WRITEBACK)
reclaim_throttle(pgdat, VMSCAN_THROTTLE_WRITEBACK);
wake_up(&pgdat->reclaim_wait[VMSCAN_THROTTLE_WRITEBACK]);