Module track_event

Nested message and enum types in TrackEvent.

Modules

legacy_event

Nested message and enum types in LegacyEvent.

Structs

LegacyEvent

Apart from {category, time, thread time, tid, pid}, other legacy trace event attributes are initially simply proxied for conversion to a JSON trace. We intend to gradually transition these attributes to similar native features in TrackEvent (e.g. async + flow events), or deprecate them without replacement where transition is unsuitable.

Enums

CounterValueField

A new value for a counter track. |track_uuid| should refer to a track with a CounterDescriptor, and |type| should be TYPE_COUNTER. For a more efficient encoding of counter values that are sampled at the beginning/end of a slice, see |extra_counter_values| and |extra_counter_track_uuids|. Counter values can optionally be encoded in as delta values (positive or negative) on each packet sequence (see CounterIncrementalBase).

NameField

Optional name of the event for its display in trace viewer. May be left unspecified for events with typed arguments.

SourceLocationField

This field is used only if the source location represents the function that executes during this event.

ThreadInstructionCount

Deprecated. Use |extra_counter_values| and |extra_counter_track_uuids| to encode thread instruction count instead.

ThreadTime

Deprecated. Use |extra_counter_values| and |extra_counter_track_uuids| to encode thread time instead.

Timestamp

Deprecated. Use the |timestamp| and |timestamp_clock_id| fields in TracePacket instead.

Type

Type of the TrackEvent (required if |phase| in LegacyEvent is not set).