PEP format specification

• File header
  • Format tag ["pep"]
  • Format version [uint16_t]
  • Number of profile traces N [uint16_t]
  • Has instruction address flag IAF [bool]
• 1..N profile traces:
  • Trace start tag ["@start"]
  • Trace label
    • Label size LS [uint16_t]
    • Label content of size LS [LS * sizeof(char)]
  • List of performance events
    • Number of events NE [uint8_t]
    • 1..NE performance events
      • Event length EL [uint8_t]
      • Event content [EL * sizeof(char)]
  • Measurements of performance events
    • Number of observations (row of measurement values) [uint32_t]
    • Measurements [NE * sizeof(long long int)]
    • Instruction address [if(IAF) then sizeof(inst_address_t)]; usually, inst_address_t == unsigned long
  • Trace end tag ["@end"]