History

Mark Salyzyn 277eca138b adb: reboot: last boot command default For reboot [reboot_arg] requests via either reboot or adb reboot, if reboot_arg is empty then report "shell" or "adb" respectively. Test: boot_reason_test.sh shell_reboot adb_reboot Bug: 63736262 Change-Id: Ie613d9e62db6a705885e4e7520aede27af3aa1b9		2017-09-12 12:24:02 -07:00
..
.clang-format	bootstat: Set up clang-format-2 for bootstat.	2017-05-24 10:19:25 -07:00
Android.bp	bootstat: introduce sys.boot.reason	2017-09-12 09:28:25 -07:00
AndroidTest.xml	Add test config to bootstat_tests	2017-04-05 14:49:47 +00:00
boot_event_record_store.cpp	bootstat: Refactor init/utils/boot_clock into base/chrono_utils.	2017-03-30 14:24:12 -07:00
boot_event_record_store.h	Revert "Revert "bootstat: Handle v1 record files which do not contain file contents.""	2016-03-25 14:26:13 -07:00
boot_event_record_store_test.cpp	bootstat: Refactor init/utils/boot_clock into base/chrono_utils.	2017-03-30 14:24:12 -07:00
boot_reason_test.sh	adb: reboot: last boot command default	2017-09-12 12:24:02 -07:00
bootstat.cpp	adb: reboot: last boot command default	2017-09-12 12:24:02 -07:00
bootstat.rc	bootstat: introduce sys.boot.reason	2017-09-12 09:28:25 -07:00
README.md	bootstat: Record the time since factory reset on init.	2016-02-24 11:01:03 -08:00
testrunner.cpp	bootstat: Fix the base includes to be AOSP-friendly.	2016-01-20 01:28:48 +00:00

README.md

bootstat

The bootstat command records boot events (e.g., firmware_loaded, boot_complete) and the relative time at which these events occurred. The command also aggregates boot event metrics locally and logs the metrics for analysis.

Usage: bootstat [options]
options include:
  -h, --help            Show this help
  -l, --log             Log all metrics to logstorage
  -p, --print           Dump the boot event records to the console
  -r, --record          Record the timestamp of a named boot event
  --record_boot_reason  Record the reason why the device booted
  --record_time_since_factory_reset Record the time since the device was reset

Relative time

The timestamp recorded by bootstat is the uptime of the system, i.e., the number of seconds since the system booted.

Recording boot events

To record the relative time of an event during the boot phase, call bootstat with the -r option and the name of the boot event.

$ bootstat -r boot_complete

The relative time at which the command runs is recorded along with the name of the boot event to be persisted.

Logging boot events

To log the persisted boot events, call bootstat with the -l option.

$ bootstat -l

bootstat logs all boot events recorded using the -r option to the EventLog using the Tron histogram. These logs may be uploaded by interested parties for aggregation and analysis of boot time across different devices and versions.

Printing boot events

To print the set of persisted boot events, call bootstat with the -p option.

$ bootstat -p
Boot events:
------------
boot_complete   71