commit 1e96e16f81ce46adf5329b1db4662b53b927d4e2
author Jamie Gennis <jgennis@google.com> Tue Jun 12 12:41:25 2012 -0700
committer Android Git Automerger <android-git-automerger@android.com> Tue Jun 12 12:41:25 2012 -0700
tree 2cbae47a7ebff235414e48be05064dfd3f689a18
parent 2a2e10fbb38e4f4d7759f619275fa4ebd596259a
parent 0f3974c3d0ee2ffe5e0cb9a56658ba18d511f6ea

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

* commit '0f3974c3d0ee2ffe5e0cb9a56658ba18d511f6ea':
  Enable tracing on user builds

rootdir/init.rc

diff --git a/rootdir/init.rc b/rootdir/init.rc
index 2305572..bb7e4ea 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.
@@ -353,10 +354,6 @@
 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
@@ -491,4 +488,3 @@
     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