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Driver timestamp and sampling period

Antonio Caggiano requested to merge driver-timestamp into master

Improve driver interface by:

  • Passing sampling period as an argument when enabling performance counters. Even though PanfrostDriver does not use it, IntelDriver needs this value for a proper initialization.

  • Returning a timestamp when dumping performance counters. PanfrostDriver just calculates a timestamp and returns it, but IntelDriver process perf records asynchronously, and these records have their own GPU timestamp which should be used instead.

Edited by Antonio Caggiano

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