In addition to the predefined PAPI preset events, the PAPI library also
exposes a majority of the events native to each platform.
Native events form the basic building blocks for PAPI presets. They can also
be used directly to access functions specific to a given platform.
Not every native event on every platform can be represented
through the native event interface. Occasionally, exotic but
valuable events are not represented. There is presently no method
for representing these events in a PAPI event set.