Android Log

This data source is supported only on Android userdebug builds.

The "android.log" data source records log events from the Android log daemon (logd). These are the same log messages that are available via adb logcat.

Both textual events and binary-formatted events from the EventLog are supported.

This allows you to see log events time-synced with the rest of the trace. When recording long traces, it allows you to record event logs indefinitely, regardless of the Android log daemon buffer size (i.e. log events are periodically fetched and copied into the trace buffer).

The data source can be configured to filter event from specific log buffers and keep only the events matching specific tags or priority.

UI

At the UI level, log events are showed in two widgets:

  1. A summary track that allows to quickly glance at the distribution of events and their severity on the timeline.

  2. A table, time-synced with the viewport, that allows to see events within the selected time range.

SQL

select l.ts, t.tid, p.pid, p.name as process, l.prio, l.tag, l.msg from android_logs as l left join thread as t using(utid) left join process as p using(upid)
ts tid pid process prio tag msg
291474737298264 29128 29128 traced_probes 4 perfetto probes_producer.cc:231 Ftrace setup (target_buf=1)
291474852699265 625 625 surfaceflinger 3 SurfaceFlinger Finished setting power mode 1 on display 0
291474853274109 1818 1228 system_server 3 SurfaceControl Excessive delay in setPowerMode()
291474882474841 1292 1228 system_server 4 DisplayPowerController Unblocked screen on after 242 ms
291474918246615 1279 1228 system_server 4 am_pss Pid=28568 UID=10194 Process Name="com.google.android.apps.fitness" Pss=12077056 Uss=10723328 SwapPss=183296 Rss=55021568 StatType=0 ProcState=18 TimeToCollect=51

TraceConfig

Trace proto: AndroidLogConfig

Config proto: AndroidPowerConfig

Sample config:

data_sources: { config { name: "android.log" android_log_config { min_prio: PRIO_VERBOSE filter_tags: "perfetto" filter_tags: "my_tag_2" log_ids: LID_DEFAULT log_ids: LID_RADIO log_ids: LID_EVENTS log_ids: LID_SYSTEM log_ids: LID_CRASH log_ids: LID_KERNEL } } }