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Commit 1279013d authored by Jamie Gennis's avatar Jamie Gennis
Browse files

Enable tracing on user builds 

This change adds init.rc steps to:
 * allow kernel tracing to be enabled via adb
 * allow a limited set of kernel trace events to be enabled via adb
 * allow the kernel trace to be read via adb
 * allow all users to write to the kernel trace from userland

Bug: 6513400
Change-Id: Ic3c189b5697aa5edf88d2f507c932971bed6caff
parent 88f11846

rootdir/init.rc

+1 −5
Original line number Diff line number Diff line
@@ -6,6 +6,7 @@ 


import /init.${ro.hardware}.rc

import /init.usb.rc

import /init.trace.rc



on early-init

    # Set init and its forked children's oom_adj.
@@ -367,10 +368,6 @@ service console /system/bin/sh 
on property:ro.debuggable=1

    start console



# Allow writing to the kernel trace log.  Enabling tracing still requires root.

on property:ro.debuggable=1

    chmod 0222 /sys/kernel/debug/tracing/trace_marker



# adbd is controlled via property triggers in init.<platform>.usb.rc

service adbd /sbin/adbd

    class core
@@ -505,4 +502,3 @@ service mdnsd /system/bin/mdnsd 
    socket mdnsd stream 0660 mdnsr inet

    disabled

    oneshot

rootdir/init.trace.rc

0 → 100644
+31 −0
Original line number Diff line number Diff line 
## Permissions to allow system-wide tracing to the kernel trace buffer.

##

on boot



# Allow writing to the kernel trace log.

    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/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/cpufreq_interactive/enable

    chown root shell /sys/kernel/debug/tracing/tracing_on



    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/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/cpufreq_interactive/enable

    chmod 0664 /sys/kernel/debug/tracing/tracing_on



# Allow only the shell group to read and truncate the kernel trace.

    chown root shell /sys/kernel/debug/tracing/trace

    chmod 0660 /sys/kernel/debug/tracing/trace