[tesla-dev] new option for iterations in PowerTOP

[Rafael Vanoni]

Here's a patch for

# RFE to have PowerTOP have an option to specify number of iterations

This functionality is useful for users who'd like to include the output 
of PowerTOP in automated scripts. It's basically an extension of the -d 
mode that causes the tool to dump output for a specified number of 
iterations.

For instance,

powertop 3

powertop -t 1 3

powertop 3 -t 1

are all valid PowerTOP options with this patch.

Let me know what you think.

thanks
Rafael
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