Use per cpu spinlock on trace list.<br>
Finish the control module, libltt and lttctl : netlink interface<br>
Finish integrating lttctl with lttd.<br>
+fix lttctl signal waiting : use a flag.<br>
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* TODO<br>
-> this information is so small that we can repeat it. Makes flight recorder
easier to decode.<br>
Add trace start structure to facility channel.<br>
+fix genevent : take no lock if num traces active is 0.<br>
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