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bootstat: Fix false metrics due to soft reboots.

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Use a flag to enable/disable logging metrics, set to false during soft
reboots.

Bug: 32807863
Change-Id: Ib1359327af4e18d40400c29961c454f7be1b8d0c
Test: None
(cherry picked from commit 800ceb45b1)
This commit is contained in:
James Hawkins 2017-01-17 13:27:05 -08:00
parent 00d5dad56f
commit b7893e6fa4
1 changed files with 19 additions and 1 deletions
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20
bootstat/bootstat.rc
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@ -11,8 +11,26 @@ on post-fs-data
on post-fs-data && property:init.svc.bootanim=running
exec - root root -- /system/bin/bootstat -r post_decrypt_time_elapsed
# sys.logbootcomplete is a signal to enable the bootstat logging mechanism.
# This signaling is necessary to prevent logging boot metrics after a soft
# reboot (e.g., adb shell stop && adb shell start). /proc/uptime is not reset
# during a soft reboot, which leads to false boot time metrics being reported.
#
# The 'on boot' event occurs once per hard boot (device power on), which
# switches the flag on. If the device performs a soft reboot, the flag is
# switched off and cannot be switched on until the device hard boots again.
# Enable bootstat logging on boot.
on boot
setprop sys.logbootcomplete 1
# Disable further bootstat logging on a soft reboot. A soft reboot is
# signaled by the zygote stopping.
on property:init.svc.zygote=stopping
setprop sys.logbootcomplete 0
# Record boot complete metrics.
on property:sys.boot_completed=1
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