Troubleshooting perf import issues

Warning in the Timeline view:

Missing cluster map.

Streamline attempts to determine the cluster configuration based on which processor, or subset of processors, each recorded event is associated with. Streamline also attempts to assign appropriate CPU names, such as Arm^® Cortex^® A53 and Arm Cortex A57, to these clusters.

This warning means that it is not possible to know from the recorded data what the CPU clusters on the device were. As perf record does not explicitly store the names of clusters, heuristics are used to work them out. However, this method can fail, which means that processor PMU counters are not separated into different clusters. Therefore counter values appear as though there is no clustering.