go/src/runtime/tracetime.go

const traceTimeDiv …

type traceTime …

// traceClockNow returns a monotonic timestamp. The clock this function gets
// the timestamp from is specific to tracing, and shouldn't be mixed with other
// clock sources.
//
// nosplit because it's called from exitsyscall and various trace writing functions,
// which are nosplit.
//
// traceClockNow is called by golang.org/x/exp/trace using linkname.
//
//go:linkname traceClockNow
//go:nosplit
func traceClockNow() traceTime { … }

// traceClockUnitsPerSecond estimates the number of trace clock units per
// second that elapse.
func traceClockUnitsPerSecond() uint64 { … }

// traceFrequency writes a batch with a single EvFrequency event.
//
// freq is the number of trace clock units per second.
func traceFrequency(gen uintptr) { … }