rootdir/init.trace.rc


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## Permissions to allow system-wide tracing to the kernel trace buffer.
##
on early-boot

# Allow writing to the kernel trace log.
    mount debugfs debugfs /sys/kernel/debug
    chmod 0755 /sys/kernel/debug
    chmod 0222 /sys/kernel/debug/tracing/trace_marker

# Allow the shell group to enable (some) kernel tracing.
    chown root shell /sys/kernel/debug/tracing/trace_clock
    chown root shell /sys/kernel/debug/tracing/buffer_size_kb
    chown root shell /sys/kernel/debug/tracing/options/overwrite
    chown root shell /sys/kernel/debug/tracing/options/record-cmd
    chown root shell /sys/kernel/debug/tracing/events/sched/sched_switch/enable
    chown root shell /sys/kernel/debug/tracing/events/sched/sched_wakeup/enable
    chown root shell /sys/kernel/debug/tracing/events/power/cpu_frequency/enable
    chown root shell /sys/kernel/debug/tracing/events/power/cpu_idle/enable
    chown root shell /sys/kernel/debug/tracing/events/power/clock_set_rate/enable
    chown root shell /sys/kernel/debug/tracing/events/cpufreq_interactive/enable
    # change to system owner for AMS to control
    chown system shell /sys/kernel/debug/tracing/tracing_on
    chown system shell /sys/kernel/debug/tracing/tracing_enabled
    chown root shell /sys/kernel/debug/tracing/set_event
    # change to system owner for capture performance log
    chown system shell /sys/kernel/debug/tracing/options/print-tgid

    chmod 0664 /sys/kernel/debug/tracing/trace_clock
    chmod 0664 /sys/kernel/debug/tracing/buffer_size_kb
    chmod 0664 /sys/kernel/debug/tracing/options/overwrite
    chmod 0664 /sys/kernel/debug/tracing/options/record-cmd
    chmod 0664 /sys/kernel/debug/tracing/events/sched/sched_switch/enable
    chmod 0664 /sys/kernel/debug/tracing/events/sched/sched_wakeup/enable
    chmod 0664 /sys/kernel/debug/tracing/events/power/cpu_frequency/enable
    chmod 0664 /sys/kernel/debug/tracing/events/power/cpu_idle/enable
    chmod 0664 /sys/kernel/debug/tracing/events/power/clock_set_rate/enable
    chmod 0664 /sys/kernel/debug/tracing/events/cpufreq_interactive/enable
    chmod 0664 /sys/kernel/debug/tracing/tracing_on
    chmod 0664 /sys/kernel/debug/tracing/tracing_enabled
    chmod 0664 /sys/kernel/debug/tracing/set_event

# Allow only the shell group to read and truncate the kernel trace.
    chown system shell /sys/kernel/debug/tracing/trace
    chmod 0664 /sys/kernel/debug/tracing/trace