[Bug 733187] integrating the tracer branch

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=733187

--- Comment #23 from Stefan Sauer (gstreamer, gtkdoc dev) <ensonic at sonicpulse.de> ---
Thiago, I merged your changes (with a small fix on the thread-id commit). I
also rebased the branch.

Regarding the thread id, yes, there are a few things that we could add to each
trace from the core. The problem is that modules need to know about it so that
its serialized in the trace message. An alternative idea would be to use a
thread-tracer that runs on all hooks and logs the current thread. The app that
analyzes the logs would need to combine logs based on timestamps. What I like
about it is that we can add all kind of other ressources this way. Right now
the rusage tracer already logs the thread-id. So if you agree tha aggregation
from the app is the way to go, we could drop the "tracer: gststats: add
thread-id to log line" commit again. WDYT?

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