[Perf] Adding timeout option

[abhishek agarwal]

Hi folks..

I was thinking that why cant we have a timeout option in perf stat
command.  The timeout feature will help us to profile a process for a
stipulated time (preferably in millisecs) and make perf stat return
after that time.

Eg:

perf stat --timeout=10 sleep 100

This will make perf return and report stats after 10 ms...

Hope anyone can shed some more light on the idea

Thanks & Regards,
Abhishek Agarwal
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