df5d12850a
(cherry pick from 2591d483c8)
Best practices so that device can set logd.logpersistd properties.
Values can be overriden with trampolines for persist.logd.logpersistd
values except as designed for empty content to keep out of the way.
This allows us to set logd.logpersistd* for a non-persistent collection
that does not survive a reboot, and to use persist.logd.logpersistd*
for persistent collection that does survive a reboot.
Added logd.logpersistd.enable to gate when logpersist service can be
run allowing the properties to be adjusted safely prior to this state
as is the case for device property.
NB: /init will complain when trying to trampoline an empty property,
this is acceptable for functionality, but may be considered
annoying from the logging perspective.
Bug: 28788401
Bug: 28813587
Bug: 28936216
Bug: 29831823
Change-Id: I97317e8eedfae4daa8e3ef39e64e7c5c23d8b573
72 lines
4.7 KiB
Text
72 lines
4.7 KiB
Text
The properties that logd and friends react to are:
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name type default description
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ro.logd.auditd bool true Enable selinux audit daemon
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ro.logd.auditd.dmesg bool true selinux audit messages duplicated and
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sent on to dmesg log
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persist.logd.security bool false Enable security buffer.
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ro.device_owner bool false Override persist.logd.security to false
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ro.logd.kernel bool+ svelte+ Enable klogd daemon
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ro.logd.statistics bool+ svelte+ Enable logcat -S statistics.
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ro.debuggable number if not "1", logd.statistics &
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ro.logd.kernel default false.
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logd.logpersistd.enable bool auto Safe to start logpersist daemon service
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logd.logpersistd string persist Enable logpersist daemon, "logcatd"
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turns on logcat -f in logd context.
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Responds to logcatd, clear and stop.
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logd.logpersistd.buffer persist logpersistd buffers to collect
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logd.logpersistd.size persist logpersistd size in MB
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persist.logd.logpersistd string Enable logpersist daemon, "logcatd"
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turns on logcat -f in logd context.
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persist.logd.logpersistd.buffer all logpersistd buffers to collect
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persist.logd.logpersistd.size 256 logpersistd size in MB
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persist.logd.size number ro Global default size of the buffer for
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all log ids at initial startup, at
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runtime use: logcat -b all -G <value>
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ro.logd.size number svelte default for persist.logd.size. Larger
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platform default sizes than 256KB are
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known to not scale well under log spam
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pressure. Address the spam first,
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resist increasing the log buffer.
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persist.logd.size.<buffer> number ro Size of the buffer for <buffer> log
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ro.logd.size.<buffer> number svelte default for persist.logd.size.<buffer>
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ro.config.low_ram bool false if true, logd.statistics, logd.kernel
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default false, logd.size 64K instead
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of 256K.
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persist.logd.filter string Pruning filter to optimize content.
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At runtime use: logcat -P "<string>"
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ro.logd.filter string "~! ~1000/!" default for persist.logd.filter.
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This default means to prune the
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oldest entries of chattiest UID, and
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the chattiest PID of system
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(1000, or AID_SYSTEM).
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persist.logd.timestamp string ro The recording timestamp source.
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"m[onotonic]" is the only supported
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key character, otherwise realtime.
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ro.logd.timestamp string realtime default for persist.logd.timestamp
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log.tag string persist The global logging level, VERBOSE,
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DEBUG, INFO, WARN, ERROR, ASSERT or
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SILENT. Only the first character is
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the key character.
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persist.log.tag string build default for log.tag
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log.tag.<tag> string persist The <tag> specific logging level.
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persist.log.tag.<tag> string build default for log.tag.<tag>
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NB:
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- auto - managed by /init
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- bool+ - "true", "false" and comma separated list of "eng" (forced false if
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ro.debuggable is not "1") or "svelte" (forced false if ro.config.low_ram is
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true).
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- svelte - see ro.config.low_ram for details.
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- svelte+ - see ro.config.low_ram and ro.debuggable for details.
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- ro - <base property> temporary override, ro.<base property> platform default.
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- persist - <base property> override, persist.<base property> platform default.
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- build - VERBOSE for native, DEBUG for jvm isLoggable, or developer option.
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- number - support multipliers (K or M) for convenience. Range is limited
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to between 64K and 256M for log buffer sizes. Individual log buffer ids
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such as main, system, ... override global default.
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- Pruning filter is of form of a space-separated list of [~][UID][/PID]
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references, where '~' prefix means to blacklist otherwise whitelist. For
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blacklisting, UID or PID may be a '!' to instead reference the chattiest
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client, with the restriction that the PID must be in the UID group 1000
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(system or AID_SYSTEM).
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