commit c06be8a15d8d89bcc8ac505b25b5e828e90a5be6
author Jamie Gennis <jgennis@google.com> Tue Jun 12 13:05:49 2012 -0700
committer Android Git Automerger <android-git-automerger@android.com> Tue Jun 12 13:05:49 2012 -0700
tree 65d210c1b8bfbbe8c3534a14f44f36f9d3953b5c
parent 60f3d65c831a40897a942513147039eef20d2149
parent 1e96e16f81ce46adf5329b1db4662b53b927d4e2

am 1e96e16f: am 0f3974c3: Merge "Enable tracing on user builds" into jb-dev

* commit '1e96e16f81ce46adf5329b1db4662b53b927d4e2':
  Enable tracing on user builds

rootdir/init.rc

diff --git a/rootdir/init.rc b/rootdir/init.rc
index 7fb50a3..24200d0 100644
--- a/rootdir/init.rc
+++ b/rootdir/init.rc
@@ -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.
@@ -354,10 +355,6 @@
 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
@@ -492,4 +489,3 @@
     socket mdnsd stream 0660 mdnsr inet
     disabled
     oneshot
-

rootdir/init.trace.rc

diff --git a/rootdir/init.trace.rc b/rootdir/init.trace.rc
new file mode 100644
index 0000000..1d114f5
--- /dev/null
+++ b/rootdir/init.trace.rc
@@ -0,0 +1,31 @@
+## 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