[ltt-dev] new ltt-trace-control module based on debugfs(v2)

[Zhaolei]

Hi Mathieu,

I modified ltt-trace-control.ko to support "overwrite" mode of each channel.
I tested it on x86, lttng 2.6.27.4-lttng-0.52, result seems ok.

run.sh in attachment can be used to test module's functions.

B.R.
Zhaolei
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