1. #! /system/bin/sh
  2.  
  3. #---
  4. RAHEAD=1024
  5. #--
  6. cat /sys/devices/virtual/bdi/179:0/read_ahead_kb
  7. echo "$RAHEAD" > /sys/devices/virtual/bdi/179:0/read_ahead_kb
  8. echo "read ahead $RAHEAD."