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system/core/bootstat/bootstat.rc
# Record boot complete metrics.
on property:sys.boot_completed=1 && property:sys.logbootcomplete=1
# Record boot_complete and related stats (decryption, etc).
exec - root root -- /system/bin/bootstat --record_boot_complete
# Record the boot reason.
exec - root root -- /system/bin/bootstat --record_boot_reason
# Record time since factory reset.
exec - root root -- /system/bin/bootstat --record_time_since_factory_reset
# Log all boot events.
exec - root root -- /system/bin/bootstat -l
system/core/bootstat/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
10:34:07 liuyq: master-backup$ tree system/core/bootstat/
system/core/bootstat/
├── Android.bp
├── AndroidTest.xml
├── boot_event_record_store.cpp
├── boot_event_record_store.h
├── boot_event_record_store_test.cpp
├── bootstat.cpp
├── bootstat.rc
├── README.md
└── testrunner.cpp
0 directories, 9 files
10:34:13 liuyq: master-backup$
const char BOOTSTAT_DATA_DIR[] = "/data/misc/bootstat/";
========================================
Boot timing
-----------
Init records some boot timing information in system properties.
`ro.boottime.init`
> Time after boot in ns (via the CLOCK\_BOOTTIME clock) at which the first
stage of init started.
`ro.boottime.init.selinux`
> How long it took the first stage to initialize SELinux.
`ro.boottime.init.cold_boot_wait`
> How long init waited for ueventd's coldboot phase to end.
`ro.boottime.<service-name>`
> Time after boot in ns (via the CLOCK\_BOOTTIME clock) that the service was
first started.
ro.boot.boottime: for BootloaderTimingMap, not reported on all devices
// |ro.boot.boottime| is of the form 'stage1:time1,...,stageN:timeN', where timeN is in milliseconds.
RecordBootComplete
time_since_last_boot: only set when last_boot_time_utc has already set when the bootstat command with record_boot_complete option executed, unit is second
last_boot_time_utc: the time when the bootstat command with record_boot_complete option executed. normally the timing that property sys.boot_completed set to 1, unit is second
build_date: value from property ro.build.date.utc, seconds since 1970-01-01 00:00:00 UTC at the build time, unit is second
factory_reset_boot_complete_no_encryption: uptime gotten with CLOCK_BOOTTIME, set when the bootstat command with record_boot_complete option executed. normally the timing that property sys.boot_completed set to 1, which means the uptime when the boot complete. unit is second
factory_reset_boot_complete: same as factory_reset_boot_complete_no_encryption
ro.boottime.init: value get from property of ro.boottime.init, Time after boot in ns (via the CLOCK\_BOOTTIME clock) at which the first stage of init started.
ro.boottime.init.selinux: value get from property of ro.boottime.init.selinux, How long it took the first stage to initialize SELinux.
ro.boottime.init.cold_boot_wait: value get from property of ro.boottime.init.cold_boot_wait, How long init waited for ueventd's coldboot phase to end, unit is ms
boottime.bootloader.*: get from property of ro.boot.boottime where the unit is ms. this is not reported by all devices.
boottime.bootloader.total: the total time taken for bootloader. this is not reported by all devices. unit is ms
absolute_boot_time: total time that includes bootloader duration and the android boot time till property sys.boot_completed set to 1
RecordBootReason:
boot_reason: get from property ro.boot.bootreason, and contvert it to integer representation. 1 for unknown reason
RecordFactoryReset: Records two metrics related to the user resetting a device: the time at which the device is reset, and the time since the user last reset the device. The former is only set once per-factory reset.
factory_reset_current_time: the time when the bootstat command with record_time_since_factory_reset option executed. normally the timing that property sys.boot_completed set to 1, unit is second
factory_reset: The factory_reset boot event does not exist after the device is reset, so use this signal to mark the time of the factory reset.
factory_reset_record_value: only set when factory_reset has been set already. The value should be the same as factory_reset.
time_since_factory_reset: only set when factory_reset has been set already. it's the diff between current_time_utc and factory_reset_utc.
================================
hikey:/ # date
Mon Jul 10 07:16:36 GMT 2017
hikey:/ # bootstat -p
Boot events:
------------
last_boot_time_utc 1499670715
build_date 1499338003
factory_reset_boot_complete_no_encryption 59
factory_reset_boot_complete 59
ro.boottime.init 5766
ro.boottime.init.selinux 148
ro.boottime.init.cold_boot_wait 399
boottime.bootloader.total 0
absolute_boot_time 59
boot_reason 1
factory_reset_current_time 1499670715
factory_reset 1499670715
hikey:/ #
--------------------------------------
hikey:/ # date
Mon Jul 10 07:19:39 GMT 2017
hikey:/ # bootstat -p
Boot events:
------------
last_boot_time_utc 1499671056
build_date 1499338003
factory_reset_boot_complete_no_encryption 59
factory_reset_boot_complete 59
ro.boottime.init 5758
ro.boottime.init.selinux 160
ro.boottime.init.cold_boot_wait 429
boottime.bootloader.total 0
absolute_boot_time 26
boot_reason 1
factory_reset_current_time 1499671056
factory_reset 1499670715
time_since_last_boot 341
boot_complete_no_encryption 26
boot_complete 26
factory_reset_record_value 1499670715
time_since_factory_reset 341
hikey:/ #
================================================
auto time_since_epoch = android::base::boot_clock::now().time_since_epoch();
auto uptime = std::chrono::duration_cast<std::chrono::seconds>(time_since_epoch);
uptime.count()
time_t current_time_utc = time(nullptr);
-------------------------------------
#type=1400 audit(1499683876.156:131): avc: denied { write } for pid=2435 comm="bootstat" name="logd" dev="tmpfs" ino=10352 scontext=u:r:bootstat:s0 tcontext=u:object_r:logd_socket:s0 tclass=sock_file permissive=1
#type=1400 audit(31.215:138): avc: denied { connectto } for pid=2378 comm="bootstat" path="/dev/socket/logd" scontext=u:r:bootstat:s0 tcontext=u:r:logd:s0 tclass=unix_stream_socket permissive=1
---------------------------------------
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