cobalt/tracing: Enhance cobalt_switch_context tracepoint
Adding PIDs and the state of the previous task will allow to track
Xenomai task switches in kernelshark (so far via out-of-tree patches,
upstream is planning for the necessary plugin concept).
Moreover, reporting the current priority on context switch helps
debugging unexpected or delayed context switches
Signed-off-by:
Jan Kiszka <jan.kiszka@siemens.com>
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