I am trying to create an application that takes advantage of Dynamic
Voltage and Frequency Scaling (DVFS).  My phone is rooted and I can
successfully scale my device with the following command:

psProc = Runtime.getRuntime().exec(new String[]{"su", "-c", "echo
300000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed"});

However, this command is executed frequently since it appears within
the repaint method of a game.  I would like to execute "echo 300000 > /
sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed 300000", without
using "su", "-c", since switching to the root user may be slow.  Can I
grant an entire application super user privileges before hand so that
I may omit "su", "-c", in my execution?

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