a4a1a4ac85
This value is read from the ro.boot.bootreason system property. Bug: 21724738 Change-Id: I43bef3d85ba9c8d87669a91da1aa675d9a86e348
49 lines
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1.6 KiB
Markdown
49 lines
No EOL
1.6 KiB
Markdown
# bootstat #
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The bootstat command records boot events (e.g., `firmware_loaded`,
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`boot_complete`) and the relative time at which these events occurred. The
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command also aggregates boot event metrics locally and logs the metrics for
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analysis.
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Usage: bootstat [options]
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options include:
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-h, --help Show this help
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-l, --log Log all metrics to logstorage
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-p, --print Dump the boot event records to the console
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-r, --record Record the timestamp of a named boot event
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--record_boot_reason Record the reason why the device booted
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## Relative time ##
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The timestamp recorded by bootstat is the uptime of the system, i.e., the
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number of seconds since the system booted.
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## Recording boot events ##
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To record the relative time of an event during the boot phase, call `bootstat`
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with the `-r` option and the name of the boot event.
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$ bootstat -r boot_complete
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The relative time at which the command runs is recorded along with the name of
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the boot event to be persisted.
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## Logging boot events ##
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To log the persisted boot events, call `bootstat` with the `-l` option.
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$ bootstat -l
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bootstat logs all boot events recorded using the `-r` option to the EventLog
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using the Tron histogram. These logs may be uploaded by interested parties
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for aggregation and analysis of boot time across different devices and
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versions.
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## Printing boot events ##
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To print the set of persisted boot events, call `bootstat` with the `-p` option.
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$ bootstat -p
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Boot events:
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------------
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boot_complete 71 |