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TracingExtension contains a stack recording the port names passed through of the Packet. The target receiving the Packet can dump out the whole path of this Packet for the debug purpose. This mechanism can be enabled with the debug flag PortTrace. Change-Id: Ic11e708b35fdddc4f4b786d91b35fd4def08948c Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/71538 Reviewed-by: Jason Lowe-Power <power.jg@gmail.com> Maintainer: Jason Lowe-Power <power.jg@gmail.com> Tested-by: kokoro <noreply+kokoro@google.com> Reviewed-by: Yu-hsin Wang <yuhsingw@google.com>