66607ebc0e
Bad comment advise in LogBuffer.cpp results in partners failing to considering using ro.logd.size to set the platform buffer size default. NB: It is not good practice to increase the log buffer size to deal with logspam, as increases will result in logd scale issues getting closer to hitting the background cgroup cpu cap. Once we hit that cap, logd spirals, pruning old entries slower than the incoming log entries. logd.writer will take 100% cpu. Change-Id: If4a7a74f300d078eeaed0ffd3eb3fd77d1f9fe90
63 lines
4.1 KiB
Text
63 lines
4.1 KiB
Text
The properties that logd responds 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.build.type string if user, logd.statistics &
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ro.logd.kernel default false.
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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.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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- bool+ - "true", "false" and comma separated list of "eng" (forced false if
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ro.build.type is "user") 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.build.type 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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