Lines Matching +full:system +full:- +full:trace
4 to emit trace events and add more app-specific context to a Perfetto trace.
9 want to collect full-stack traces that overlay app trace events with system
10 trace events like scheduler traces, syscalls or any other Perfetto data
13 2. For app-specific tracing, whether you need to trace simple types of timeline
15 custom strongly-typed schema (e.g., for dumping the state of a subsystem of
16 your app into the trace).
18 For Android-only instrumentation, the advice is to keep using the existing
19 [android.os.Trace (SDK)][atrace-sdk] / [ATrace\_\* (NDK)][atrace-ndk] if they
20 are sufficient for your use cases. Atrace-based instrumentation is fully
21 supported in Perfetto. See the [Data Sources -> Android System -> Atrace
22 Instrumentation][atrace-ds] for details.
32 git clone https://android.googlesource.com/platform/external/perfetto -b v48.1
37 build systems. The sources are self-contained and require only a C++17 compliant
60 add_definitions(-DWIN32_LEAN_AND_MEAN -DNOMINMAX)
65 # Enable standards-compliant mode when using the Visual Studio compiler.
67 target_compile_options(example PRIVATE "/permissive-")
79 // The backends determine where trace events are recorded. You may select one
82 // 1) The in-process backend only records within the app itself.
85 // 2) The system backend writes events into a system Perfetto daemon,
86 // allowing merging app and system events (e.g., ftrace) on the same
95 You are now ready to instrument your app with trace events.
101 [track events](#track-events) and [custom data sources](#custom-data-sources).
105 Track events are the suggested option when dealing with app-specific tracing as
142 
147 To include your new track events in the trace, ensure that the `track_event`
148 data source is included in the trace config, with a list of enabled and disabled
163 See the [Track events page](track-events.md) for full instructions.
174 corresponding changes in [trace processor](/docs/analysis/trace-processor.md) to
199 // Data sources can also have per-instance state.
226 trace config to enable tracing:
230 auto* ds_cfg = cfg.add_data_sources()->mutable_config();
231 ds_cfg->set_name("com.example.custom_data_source");
234 Finally, call the `Trace()` method to record an event with your custom data
240 CustomDataSource::Trace([](CustomDataSource::TraceContext ctx) {
242 packet->set_timestamp(perfetto::TrackEvent::GetTraceTimeNs());
243 packet->set_for_testing()->set_str("Hello world!");
247 If necessary the `Trace()` method can access the custom data source state
250 `Trace()` method is called on another thread. For example:
253 CustomDataSource::Trace([](CustomDataSource::TraceContext ctx) {
255 DoSomethingWith(safe_handle->my_custom_state);
259 ## In-process vs System mode
262 both modes and respond both to in-process tracing requests and system tracing
263 requests. Both modes generate the same trace file format.
265 ### In-process mode
267 In this mode both the perfetto service and the app-defined data sources are
268 hosted fully in-process, in the same process of the profiled app. No connection
269 to the system `traced` daemon will be attempted.
271 In-process mode can be enabled by setting
278 The main advantage is that by running fully in-process, it doesn't require any
284 ### System mode
286 In this mode the app-defined data sources will connect to the external `traced`
289 System mode can be enabled by setting
295 full-stack performance investigations, looking all the way through syscalls and
305 When using system mode, the tracing session must be controlled from the outside,
306 using the `perfetto` command-line client (See
307 [reference](/docs/reference/perfetto-cli)). This is because when collecting
308 system traces, tracing data producers are not allowed to read back the trace
310 side-channel attacks.
312 - On Android 9 (Pie) and beyond, traced is shipped as part of the platform.
313 - On older versions of Android, traced can be built from sources using the the
314 [standalone NDK-based workflow](/docs/contributing/build-instructions.md) and
316 - On Linux and MacOS and Windows `traced` must be built and run separately. See
317 the [Linux quickstart](/docs/quickstart/linux-tracing.md) for instructions.
318 - On Windows the tracing protocol works over TCP/IP (
324 _Tracing through the API is currently only supported with the in-process mode.
325 When using system mode, use the `perfetto` cmdline client (see quickstart
328 First initialize a [TraceConfig](/docs/reference/trace-config-proto.autogen)
331 If your app includes [track events](track-events.md) (i.e, `TRACE_EVENT`), you
334 By default, all non-debug categories are enabled, but you can enable a specific
343 Next, build the main trace config together with the track event part:
347 cfg.add_buffers()->set_size_kb(1024); // Record up to 1 MiB.
348 auto* ds_cfg = cfg.add_data_sources()->mutable_config();
349 ds_cfg->set_name("track_event");
350 ds_cfg->set_track_event_config_raw(track_event_cfg.SerializeAsString());
356 ds_cfg = cfg.add_data_sources()->mutable_config();
357 ds_cfg->set_name("my_data_source");
360 After building the trace config, you can begin tracing:
365 tracing_session->Setup(cfg);
366 tracing_session->StartBlocking();
374 to record. After that, stop tracing and collect the protobuf-formatted trace
378 tracing_session->StopBlocking();
379 std::vector<char> trace_data(tracing_session->ReadTraceBlocking());
381 // Write the trace into a file.
383 output.open("example.perfetto-trace", std::ios::out | std::ios::binary);
393 int fd = open("example.perfetto-trace", O_RDWR | O_CREAT | O_TRUNC, 0600);
394 tracing_session->Setup(cfg, fd);
395 tracing_session->StartBlocking();
397 tracing_session->StopBlocking();
401 The resulting trace file can be directly opened in the
403 [Trace Processor](/docs/analysis/trace-processor.md).
405 [ipc]: /docs/design-docs/api-and-abi.md#socket-protocol
406 [atrace-ds]: /docs/data-sources/atrace.md
407 [atrace-ndk]: https://developer.android.com/ndk/reference/group/tracing
408 [atrace-sdk]: https://developer.android.com/reference/android/os/Trace