All ftrace generated files are present under a common base folder.
This patch updates the FtraceCollector API to exposes just the common
base folder from where all the other paths can be generated.
This is a refactoring patch which makes it easier to add further attributes.
Signed-off-by: Patrick Bellasi <patrick.bellasi@arm.com>
When the cpufreq module is loaded, quite likely we want to run experiments
which involve an analysis of frequencies transitions. However, if during
an experiment there are not cpu_frequency events, the generated trace
does not allows to know at which frequency the experiment has been executed.
This happens for example when we are running at constant frequency or just
because the workload is not generating a variable capacity request in the
system.
This path ensure the a "cpu_frequency" events is always generated at the
beginning and at the end of a collected trace. This support is required
for example to properly plot CPUs frequencies event when there are not
CPUFreq generated changes of OPP.
Signed-off-by: Patrick Bellasi <patrick.bellasi@arm.com>
