platform_system_core/logd/README.property
Mark Salyzyn 100658c303 init.rc: logd: Add logpersistd (nee logcatd)
- logpersistd is defined as a thread or process in the context of the
  logd domain. Here we define logpersistd as logcat -f in logd domain
  and call it logcatd to represent its service mechanics.
- Use logcatd to manage content in /data/misc/logd/ directory.
- Only turn on for persist.logd.logpersistd = logcatd.
- Add logpersist.start, logpersist.stop and logpersist.cat debug
  class executables, thus only in the eng and userdebug builds.

ToDo: Wish to add Developer Options menu to turn this feature on or
off, complicated by the fact that user builds have no tools with
access rights to /data/misc/logd.

Bug: 19608716
Change-Id: I57ad757f121c473d04f9fabe9d4820a0eca06f31
2015-06-02 15:17:59 -07:00

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The properties that logd responds to are:
name type default description
logd.auditd bool true Enable selinux audit daemon
logd.auditd.dmesg bool true selinux audit messages duplicated and
sent on to dmesg log
logd.klogd bool depends Enable klogd daemon
logd.statistics bool depends Enable logcat -S statistics.
ro.config.low_ram bool false if true, logd.statistics & logd.klogd
default false
ro.build.type string if user, logd.statistics & logd.klogd
default false
persist.logd.logpersistd string Enable logpersist daemon, "logcatd"
turns on logcat -f in logd context
persist.logd.size number 256K default size of the buffer for all
log ids at initial startup, at runtime
use: logcat -b all -G <value>
persist.logd.size.main number 256K Size of the buffer for the main log
persist.logd.size.system number 256K Size of the buffer for the system log
persist.logd.size.radio number 256K Size of the buffer for the radio log
persist.logd.size.event number 256K Size of the buffer for the event log
persist.logd.size.crash number 256K Size of the buffer for the crash log
NB:
- number support multipliers (K or M) for convenience. Range is limited
to between 64K and 256M for log buffer sizes. Individual logs override the
global default.