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When opening and closing activities in Settings, a measurably
significant amount of CPU time is spent processing and logging stats
events in statsd:
0.02% /apex/com.android.os.statsd/lib64/libstatspull.so @plt
0.01% /apex/com.android.os.statsd/bin/statsd @plt
0.01% /apex/com.android.os.statsd/bin/statsd SocketListener::runListener()
0.01% /apex/com.android.os.statsd/bin/statsd android::os::statsd::LogEvent::parseBuffer(unsigned char*, unsigned long)
0.01% /apex/com.android.os.statsd/bin/statsd android::os::statsd::LogEvent::parseAnnotations(unsigned char, int)
Over longer device uptimes with real-world usage, statsd uses a
substantial amount of total CPU time. We have no use for the stats
recorded by statsd, so disable the service entirely to save CPU in
potential hotpaths.
Test: simpleperf record -a; verify that statsd no longer appears in
sample hits