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The Processes section of the Timeline view shows you the active processes in each bin. The entries are derived from process/thread trace data from the Linux kernel scheduler. Weighted colors reflect the number of samples in each process or thread.
Figure 6-8 Process bars
Here is what each of the colored bins in the processes section represent:
Figure 6-9 CPU contention dots in the Timeline view
If you select any number of processes or threads, all the charts in the Timeline view update to reflect only activity caused by the selected processes and threads. All charts that do not contain the necessary process information are blanked out.
Each of the multi-threaded or annotated processes in the list have a disclosure control. Use the control to show each of the threads and annotations for that process. Annotations shown here can be hierarchical, with annotation groups each containing a set of channels, as defined by the macros inserted in your code.