When the user calls Tuner. TIS calls Tuner. During tuning, you can call stopTune or close to pause or end the Tuner. If TIS doesn't have enough information to use Tuner. TIS uses Tuner. The HAL might also report other scan messages to provide additional information about the signal.
TIS uses Frontend. During scanning, you can call stopScan or close to pause or end the scan. If TIS doesn't have a frequency list and the Vendor HAL can search for the frequency of the user-specified frontend to get the frontend resource, then Tuner.
The filter package is a collection of filter operations along with configuration, settings, callbacks, and events. The package includes the operations below. Refer to the Android source code for the complete list of operations. FilterConfiguration is derived from the classes below. The configurations are for the main filter type and they specify which protocol the filter uses to extract data. The settings are derived from the classes below. The settings are for the filter subtype and they specify what kinds of data the filter can exclude.
FilterEvent is derived from the classes below to report events for different kinds of data. Tuner HAL 1. The Tuner HAL supports filter linkage such that filters can be linked to other filters for multiple layers. The filters follow the rules below. TV Input Framework TIF used a "first-to-acquire win" mechanism, which means whichever app gets the resource first keeps the resource. However, this mechanism might not be ideal for some complicated use cases.
TRM uses a "foreground win" mechanism, which calculates the app's priority based on the app's foreground or background status and use case type.
TRM grants or revokes the resource based on the priority. TRM calculates the client's priority by using parameters from the client's profile and the priority value from the configuration file.
The priority might also be updated by an arbitrary priority value from the client. The predefined use cases are listed below. The default configuration file below provides priority values for predefined use cases. Users can change the values using a customized configuration file. This file is used to add, remove, or update the use case types and the use case priority values. TRM provides updateClientPriority for the client to update the arbitrary priority value and nice value.
The arbitrary priority value overwrites the priority value calculated from use case type and session ID. The nice value indicates how lenient the client's behavior is when it's in conflict with another client. The nice value decreases the client's priority value before its priority value is compared to the challenging client. The diagram below shows how resources are reclaimed and assigned when a resource conflict happens.
Figure Diagram of the reclaim mechanism for a conflict between Tuner resources. Content and code samples on this page are subject to the licenses described in the Content License. Docs Getting Started About. Core Topics Architecture. Overview Automotive.
Used for diverting trace data to non-Perfetto sources e. For example if we are tracing probabilistically, most traces will be uninteresting. Triggers allow us to keep only the interesting ones such as those traces during which the device temperature reached a certain threshold. Configuration for trace contents that reference earlier trace data. Future packets from that data source can then use the interned ids instead of duplicating the raw string contents.
The trace parser will then need to use that interning table to fully interpret the rest of the trace. Not for general use.
If set, saves the trace into an incident. When set applies a post-filter to the trace contents using the filter provided. Reintroduced in Android T with a different field number. However in case of traces with triggers, see TriggerConfig. The service will then periodically read packets out of the trace buffer and store it into the passed file.
If the file exists the service will NOT overwrite and will fail instead as a security precaution. This option has been introduced in Android R.
If non-zero tunes the write period. A min value of ms is enforced i. When non zero the periodic write stops once at most X bytes have been written into the file. This is to support early initialization and fast trace triggering.
This can be used only when the Consumer explicitly triggers the StartTracing method. This should not be used in a remote trace config via statsd, doing so will result in a hung trace session. This can be used for quasi-real-time streaming mode and to guarantee some partial ordering of events in the trace in windows of X ms. Default 5s. If set, sends an intent to the Traceur system app when the trace ends to notify it about the trace readiness. This field effectively acts as a z-index for bugreports.
This field was introduced in Android S. On user builds when --dropbox is set perfetto will refuse to trace unless this is also set. Added in Q. If specified, sets the logging to statsd of guardrails and checkpoints in the tracing service. The buffer operates as a conventional ring buffer. If the writer is faster than the reader or if the reader reads only after tracing is stopped newly written packets will overwrite old packets. As soon as the writer hits an unread chunk, it stops accepting new data in the buffer.
DataSourceConfig Filters and data-source specific config. It contains also the unique name of the data source, the one passed in the DataSourceDescriptor when they register on the service. This allows to enable a data source only for specific processes. The "repeated" fields have OR semantics: specifying a filter ["foo", "bar"] will enable data sources on both "foo" and "bar" if they exist.
This must match the name passed by the data source when it registers see RegisterDataSource. This field doesn't make a major difference for the Producer s. The final logging buffers, in fact, are completely owned by the Service. We just ask the Producer to copy this number into the chunk headers it emits, so that the Service can quickly identify the buffer where to move the chunks into without expensive lookups on its fastpath.
The intended use case for this is checking if two data sources, one of which produces metadata for the other one, belong to the same trace session and hence should be linked together. This field was introduced in Aug after Android P. This can be used, for example, to write trace data into ETW or for logging trace points to the console.
Data sources that don't use that API e. In theory this should never be needed. All the code that is part of the platform i. However, if anything in the pipeline client or backend ends up breaking this forward compat plan, this field will become the escape hatch to allow future data sources to get some meaningful configuration.
This system app is expected to not expose the trace to the user of the device. This is determined by checking the UID initiating the trace. Unfortunately that makes ksyms integration tests hard. This flag forces the kernel symbolizer to be initialized synchronously on the data source start and hence avoiding timing races in tests. CompactSchedConfig Configuration for compact encoding of scheduler events.
Non-multiples will be rounded down to the nearest multiple. If not specificed, the default is used. Cost: 0. Otherwise, only the counters specified below are reported. Cost: 4. This option can be used to record unchanging values.
Set to 1 for perfect accuracy. Adaptive sampling is disabled when set to 0. If it contains " ", everything after the first is discared. This transformation is also applied to the processes' command lines when matching. If left empty, only samples "malloc". Introduced in Android On unmodified userdebug builds, this will lead to system crashes. Zygote will crash when trying to launch a new process as it will have an unexpected open socket to heapprofd.
Defaults to 8 MiB. If larger than MiB, truncated to MiB. Use with caution as this will significantly slow down the target process. Needs to be larger than us, otherwise no retries are done. Only match processes on startup. This causes ProfilePacket. This auto-detection can be disabled with this. This can be useful if lots of uninteresting objects, e.
A dump is always created at the beginning of the trace. Available from Android S. PackagesListConfig Data source that lists details such as version code about packages on an Android device.
Otherwise, emit info about all packages. Timebase What event to sample on, and how often. Star 7. New issue. Jump to bottom. Labels area-System. Net question. Milestone 1. Copy link. Hi All, Googling around I found that Windows.
Thanks, -Brian The text was updated successfully, but these errors were encountered:. Create, FileAccess. Write, FileShare. ReadAsync buffer, 0, buffer. WriteLine string. BytesTransferred and e. This is a closed issue. There are no changes to reporting progress. My previous feedback is still accurate: There are no progress callback features of System. Microsoft used a clever way to guide me to learn their source code! Sign up for free to subscribe to this conversation on GitHub.
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