From: Chris Wilson on
Out of curiosity what motivated this patch? When adding the tracepoints,
I found the overhead of compiling in but not enabling them to be
insignificant, i.e. nearly unmeasurable in throughput benchmarks, so
didn't believe it warranted a config option. Especially one that advises
people to turn off what may be a useful aid in desktop systems.

Also is TRACER the right name, that would seem to confuse the option with
a standalone tracer as opposed to simply enabling tracepoints.

Chris Wilson, Intel Open Source Technology Centre
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