trace

const (
	// Special P identifiers:
	FakeP    = 1000000 + iota
	TimerP   // depicts timer unblocks
	NetpollP // depicts network unblocks
	SyscallP // depicts returns from syscalls
)

const (
	EvNone           = 0  // unused
	EvBatch          = 1  // start of per-P batch of events [pid, timestamp]
	EvFrequency      = 2  // contains tracer timer frequency [frequency (ticks per second)]
	EvStack          = 3  // stack [stack id, number of PCs, array of PCs]
	EvGomaxprocs     = 4  // current value of GOMAXPROCS [timestamp, GOMAXPROCS, stack id]
	EvProcStart      = 5  // start of P [timestamp, thread id]
	EvProcStop       = 6  // stop of P [timestamp]
	EvGCStart        = 7  // GC start [timestamp, stack id]
	EvGCDone         = 8  // GC done [timestamp]
	EvGCScanStart    = 9  // GC scan start [timestamp]
	EvGCScanDone     = 10 // GC scan done [timestamp]
	EvGCSweepStart   = 11 // GC sweep start [timestamp, stack id]
	EvGCSweepDone    = 12 // GC sweep done [timestamp]
	EvGoCreate       = 13 // goroutine creation [timestamp, new goroutine id, start PC, stack id]
	EvGoStart        = 14 // goroutine starts running [timestamp, goroutine id]
	EvGoEnd          = 15 // goroutine ends [timestamp]
	EvGoStop         = 16 // goroutine stops (like in select{}) [timestamp, stack]
	EvGoSched        = 17 // goroutine calls Gosched [timestamp, stack]
	EvGoPreempt      = 18 // goroutine is preempted [timestamp, stack]
	EvGoSleep        = 19 // goroutine calls Sleep [timestamp, stack]
	EvGoBlock        = 20 // goroutine blocks [timestamp, stack]
	EvGoUnblock      = 21 // goroutine is unblocked [timestamp, goroutine id, stack]
	EvGoBlockSend    = 22 // goroutine blocks on chan send [timestamp, stack]
	EvGoBlockRecv    = 23 // goroutine blocks on chan recv [timestamp, stack]
	EvGoBlockSelect  = 24 // goroutine blocks on select [timestamp, stack]
	EvGoBlockSync    = 25 // goroutine blocks on Mutex/RWMutex [timestamp, stack]
	EvGoBlockCond    = 26 // goroutine blocks on Cond [timestamp, stack]
	EvGoBlockNet     = 27 // goroutine blocks on network [timestamp, stack]
	EvGoSysCall      = 28 // syscall enter [timestamp, stack]
	EvGoSysExit      = 29 // syscall exit [timestamp, goroutine id, real timestamp]
	EvGoSysBlock     = 30 // syscall blocks [timestamp]
	EvGoWaiting      = 31 // denotes that goroutine is blocked when tracing starts [goroutine id]
	EvGoInSyscall    = 32 // denotes that goroutine is in syscall when tracing starts [goroutine id]
	EvHeapAlloc      = 33 // memstats.heap_alloc change [timestamp, heap_alloc]
	EvNextGC         = 34 // memstats.next_gc change [timestamp, next_gc]
	EvTimerGoroutine = 35 // denotes timer goroutine [timer goroutine id]
	EvFutileWakeup   = 36 // denotes that the previous wakeup of this goroutine was futile [timestamp]
	EvCount          = 37
)