components/tracing/proto/event.proto

// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

syntax = "proto2";
option optimize_for = LITE_RUNTIME;

package tracing.proto;

// Note on field numbers: fields in the range [1, 15] can be encoded using a
// single byte preamble. Hence they should be used only for the most commonly
// used fields (to save trace size). Use the range 16+ for fields that are not
// expected to be used frequently.
message Event {
  // Using ASCII codes as enum values, according to the legacy phase arguments
  // ("ph") of the Trace Event Format doc (https://goo.gl/mSXylN).
  enum EventType {
    METADATA = 77;  // = 'M'.
    COMPLETE = 88;  // = 'X'.
  };

  optional EventType type = 1;

  oneof name {
    int64 name_id = 2;
    string name_str = 16;
  }

  optional int64 category_id = 4;

  optional uint64 timestamp = 5;
  optional uint64 thread_timestamp = 6;

  // TODO(primiano,kraynov): Add args and further fields in next CLs.
}