diff --git a/cmds/atrace/atrace.rc b/cmds/atrace/atrace.rc
index 1c88ff9..406f909 100644
--- a/cmds/atrace/atrace.rc
+++ b/cmds/atrace/atrace.rc
@@ -127,6 +127,42 @@
     chmod 0666 /sys/kernel/debug/tracing/trace
     chmod 0666 /sys/kernel/tracing/trace
 
+# Read and truncate the per-CPU kernel trace.
+# Cannot use wildcards in .rc files. Update this if there is a phone with
+# more CPUs.
+    chmod 0666 /sys/kernel/debug/tracing/per_cpu/cpu0/trace
+    chmod 0666 /sys/kernel/tracing/per_cpu/cpu0/trace
+    chmod 0666 /sys/kernel/debug/tracing/per_cpu/cpu1/trace
+    chmod 0666 /sys/kernel/tracing/per_cpu/cpu1/trace
+    chmod 0666 /sys/kernel/debug/tracing/per_cpu/cpu2/trace
+    chmod 0666 /sys/kernel/tracing/per_cpu/cpu2/trace
+    chmod 0666 /sys/kernel/debug/tracing/per_cpu/cpu3/trace
+    chmod 0666 /sys/kernel/tracing/per_cpu/cpu3/trace
+    chmod 0666 /sys/kernel/debug/tracing/per_cpu/cpu4/trace
+    chmod 0666 /sys/kernel/tracing/per_cpu/cpu4/trace
+    chmod 0666 /sys/kernel/debug/tracing/per_cpu/cpu5/trace
+    chmod 0666 /sys/kernel/tracing/per_cpu/cpu5/trace
+    chmod 0666 /sys/kernel/debug/tracing/per_cpu/cpu6/trace
+    chmod 0666 /sys/kernel/tracing/per_cpu/cpu6/trace
+    chmod 0666 /sys/kernel/debug/tracing/per_cpu/cpu6/trace
+    chmod 0666 /sys/kernel/tracing/per_cpu/cpu7/trace
+    chmod 0666 /sys/kernel/debug/tracing/per_cpu/cpu8/trace
+    chmod 0666 /sys/kernel/tracing/per_cpu/cpu8/trace
+    chmod 0666 /sys/kernel/debug/tracing/per_cpu/cpu9/trace
+    chmod 0666 /sys/kernel/tracing/per_cpu/cpu9/trace
+    chmod 0666 /sys/kernel/debug/tracing/per_cpu/cpu10/trace
+    chmod 0666 /sys/kernel/tracing/per_cpu/cpu10/trace
+    chmod 0666 /sys/kernel/debug/tracing/per_cpu/cpu11/trace
+    chmod 0666 /sys/kernel/tracing/per_cpu/cpu11/trace
+    chmod 0666 /sys/kernel/debug/tracing/per_cpu/cpu12/trace
+    chmod 0666 /sys/kernel/tracing/per_cpu/cpu12/trace
+    chmod 0666 /sys/kernel/debug/tracing/per_cpu/cpu13/trace
+    chmod 0666 /sys/kernel/tracing/per_cpu/cpu13/trace
+    chmod 0666 /sys/kernel/debug/tracing/per_cpu/cpu14/trace
+    chmod 0666 /sys/kernel/tracing/per_cpu/cpu14/trace
+    chmod 0666 /sys/kernel/debug/tracing/per_cpu/cpu15/trace
+    chmod 0666 /sys/kernel/tracing/per_cpu/cpu15/trace
+
 on property:persist.debug.atrace.boottrace=1
     start boottrace