I want to create a custom application for tracing data without using tracelogger. 
I understand for that I will have to write  a Data-Capture utility which manages the buffer & collects the trace data.

From the "System Analysis Toolkit ", it seems that I will have to wait for the signal from the instrumented kernel when 
a high watermark is reached, but
1) which signal should I wait for ?
2) how does the kernel get to know that the signal has to be sent to "this custom application" & not tracelogger .