diff --git a/cmds/atrace/atrace.rc b/cmds/atrace/atrace.rc
index 3ea1d56..89ce1e5 100644
--- a/cmds/atrace/atrace.rc
+++ b/cmds/atrace/atrace.rc
@@ -6,141 +6,86 @@
     chmod 0222 /sys/kernel/debug/tracing/trace_marker
     chmod 0222 /sys/kernel/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/tracing/trace_clock
-    chown root shell /sys/kernel/debug/tracing/buffer_size_kb
-    chown root shell /sys/kernel/tracing/buffer_size_kb
-    chown root shell /sys/kernel/debug/tracing/options/overwrite
-    chown root shell /sys/kernel/tracing/options/overwrite
-    chown root shell /sys/kernel/debug/tracing/options/print-tgid
-    chown root shell /sys/kernel/tracing/options/print-tgid
-    chown root shell /sys/kernel/debug/tracing/saved_cmdlines_size
-    chown root shell /sys/kernel/tracing/saved_cmdlines_size
-    chown root shell /sys/kernel/debug/tracing/events/sched/sched_switch/enable
-    chown root shell /sys/kernel/tracing/events/sched/sched_switch/enable
-    chown root shell /sys/kernel/debug/tracing/events/sched/sched_wakeup/enable
-    chown root shell /sys/kernel/tracing/events/sched/sched_wakeup/enable
-    chown root shell /sys/kernel/debug/tracing/events/sched/sched_blocked_reason/enable
-    chown root shell /sys/kernel/tracing/events/sched/sched_blocked_reason/enable
-    chown root shell /sys/kernel/debug/tracing/events/sched/sched_cpu_hotplug/enable
-    chown root shell /sys/kernel/tracing/events/sched/sched_cpu_hotplug/enable
-    chown root shell /sys/kernel/debug/tracing/events/cgroup/enable
-    chown root shell /sys/kernel/tracing/events/cgroup/enable
-    chown root shell /sys/kernel/debug/tracing/events/power/cpu_frequency/enable
-    chown root shell /sys/kernel/tracing/events/power/cpu_frequency/enable
-    chown root shell /sys/kernel/debug/tracing/events/power/cpu_idle/enable
-    chown root shell /sys/kernel/tracing/events/power/cpu_idle/enable
-    chown root shell /sys/kernel/debug/tracing/events/power/clock_set_rate/enable
-    chown root shell /sys/kernel/tracing/events/power/clock_set_rate/enable
-    chown root shell /sys/kernel/debug/tracing/events/power/cpu_frequency_limits/enable
-    chown root shell /sys/kernel/tracing/events/power/cpu_frequency_limits/enable
-    chown root shell /sys/kernel/debug/tracing/events/cpufreq_interactive/enable
-    chown root shell /sys/kernel/tracing/events/cpufreq_interactive/enable
-    chown root shell /sys/kernel/debug/tracing/events/vmscan/mm_vmscan_direct_reclaim_begin/enable
-    chown root shell /sys/kernel/tracing/events/vmscan/mm_vmscan_direct_reclaim_begin/enable
-    chown root shell /sys/kernel/debug/tracing/events/vmscan/mm_vmscan_direct_reclaim_end/enable
-    chown root shell /sys/kernel/tracing/events/vmscan/mm_vmscan_direct_reclaim_end/enable
-    chown root shell /sys/kernel/debug/tracing/events/vmscan/mm_vmscan_kswapd_wake/enable
-    chown root shell /sys/kernel/tracing/events/vmscan/mm_vmscan_kswapd_wake/enable
-    chown root shell /sys/kernel/debug/tracing/events/vmscan/mm_vmscan_kswapd_sleep/enable
-    chown root shell /sys/kernel/tracing/events/vmscan/mm_vmscan_kswapd_sleep/enable
-    chown root shell /sys/kernel/debug/tracing/events/binder/binder_transaction/enable
-    chown root shell /sys/kernel/tracing/events/binder/binder_transaction/enable
-    chown root shell /sys/kernel/debug/tracing/events/binder/binder_transaction_received/enable
-    chown root shell /sys/kernel/tracing/events/binder/binder_transaction_received/enable
-    chown root shell /sys/kernel/debug/tracing/events/binder/binder_lock/enable
-    chown root shell /sys/kernel/tracing/events/binder/binder_lock/enable
-    chown root shell /sys/kernel/debug/tracing/events/binder/binder_locked/enable
-    chown root shell /sys/kernel/tracing/events/binder/binder_locked/enable
-    chown root shell /sys/kernel/debug/tracing/events/binder/binder_unlock/enable
-    chown root shell /sys/kernel/tracing/events/binder/binder_unlock/enable
-    chown root shell /sys/kernel/debug/tracing/events/lowmemorykiller/enable
-    chown root shell /sys/kernel/tracing/events/lowmemorykiller/enable
+# Grant unix world read/write permissions to kernel tracepoints.
+# Access control to these files is now entirely in selinux policy.
+    chmod 0666 /sys/kernel/debug/tracing/trace_clock
+    chmod 0666 /sys/kernel/tracing/trace_clock
+    chmod 0666 /sys/kernel/debug/tracing/buffer_size_kb
+    chmod 0666 /sys/kernel/tracing/buffer_size_kb
+    chmod 0666 /sys/kernel/debug/tracing/options/overwrite
+    chmod 0666 /sys/kernel/tracing/options/overwrite
+    chmod 0666 /sys/kernel/debug/tracing/options/print-tgid
+    chmod 0666 /sys/kernel/tracing/options/print-tgid
+    chmod 0666 /sys/kernel/debug/tracing/saved_cmdlines_size
+    chmod 0666 /sys/kernel/tracing/saved_cmdlines_size
+    chmod 0666 /sys/kernel/debug/tracing/events/sched/sched_switch/enable
+    chmod 0666 /sys/kernel/tracing/events/sched/sched_switch/enable
+    chmod 0666 /sys/kernel/debug/tracing/events/sched/sched_wakeup/enable
+    chmod 0666 /sys/kernel/tracing/events/sched/sched_wakeup/enable
+    chmod 0666 /sys/kernel/debug/tracing/events/sched/sched_blocked_reason/enable
+    chmod 0666 /sys/kernel/tracing/events/sched/sched_blocked_reason/enable
+    chmod 0666 /sys/kernel/debug/tracing/events/sched/sched_cpu_hotplug/enable
+    chmod 0666 /sys/kernel/tracing/events/sched/sched_cpu_hotplug/enable
+    chmod 0666 /sys/kernel/debug/tracing/events/cgroup/enable
+    chmod 0666 /sys/kernel/tracing/events/cgroup/enable
+    chmod 0666 /sys/kernel/debug/tracing/events/power/cpu_frequency/enable
+    chmod 0666 /sys/kernel/tracing/events/power/cpu_frequency/enable
+    chmod 0666 /sys/kernel/debug/tracing/events/power/cpu_idle/enable
+    chmod 0666 /sys/kernel/tracing/events/power/cpu_idle/enable
+    chmod 0666 /sys/kernel/debug/tracing/events/power/clock_set_rate/enable
+    chmod 0666 /sys/kernel/tracing/events/power/clock_set_rate/enable
+    chmod 0666 /sys/kernel/debug/tracing/events/power/cpu_frequency_limits/enable
+    chmod 0666 /sys/kernel/tracing/events/power/cpu_frequency_limits/enable
+    chmod 0666 /sys/kernel/debug/tracing/events/cpufreq_interactive/enable
+    chmod 0666 /sys/kernel/tracing/events/cpufreq_interactive/enable
+    chmod 0666 /sys/kernel/debug/tracing/events/vmscan/mm_vmscan_direct_reclaim_begin/enable
+    chmod 0666 /sys/kernel/tracing/events/vmscan/mm_vmscan_direct_reclaim_begin/enable
+    chmod 0666 /sys/kernel/debug/tracing/events/vmscan/mm_vmscan_direct_reclaim_end/enable
+    chmod 0666 /sys/kernel/tracing/events/vmscan/mm_vmscan_direct_reclaim_end/enable
+    chmod 0666 /sys/kernel/debug/tracing/events/vmscan/mm_vmscan_kswapd_wake/enable
+    chmod 0666 /sys/kernel/tracing/events/vmscan/mm_vmscan_kswapd_wake/enable
+    chmod 0666 /sys/kernel/debug/tracing/events/vmscan/mm_vmscan_kswapd_sleep/enable
+    chmod 0666 /sys/kernel/tracing/events/vmscan/mm_vmscan_kswapd_sleep/enable
+    chmod 0666 /sys/kernel/debug/tracing/tracing_on
+    chmod 0666 /sys/kernel/tracing/tracing_on
+    chmod 0666 /sys/kernel/debug/tracing/events/binder/binder_transaction/enable
+    chmod 0666 /sys/kernel/tracing/events/binder/binder_transaction/enable
+    chmod 0666 /sys/kernel/debug/tracing/events/binder/binder_transaction_received/enable
+    chmod 0666 /sys/kernel/tracing/events/binder/binder_transaction_received/enable
+    chmod 0666 /sys/kernel/debug/tracing/events/binder/binder_lock/enable
+    chmod 0666 /sys/kernel/tracing/events/binder/binder_lock/enable
+    chmod 0666 /sys/kernel/debug/tracing/events/binder/binder_locked/enable
+    chmod 0666 /sys/kernel/tracing/events/binder/binder_locked/enable
+    chmod 0666 /sys/kernel/debug/tracing/events/binder/binder_unlock/enable
+    chmod 0666 /sys/kernel/tracing/events/binder/binder_unlock/enable
+    chmod 0666 /sys/kernel/debug/tracing/events/i2c/enable
+    chmod 0666 /sys/kernel/tracing/events/i2c/enable
+    chmod 0666 /sys/kernel/debug/tracing/events/i2c/i2c_read/enable
+    chmod 0666 /sys/kernel/tracing/events/i2c/i2c_read/enable
+    chmod 0666 /sys/kernel/debug/tracing/events/i2c/i2c_write/enable
+    chmod 0666 /sys/kernel/tracing/events/i2c/i2c_write/enable
+    chmod 0666 /sys/kernel/debug/tracing/events/i2c/i2c_result/enable
+    chmod 0666 /sys/kernel/tracing/events/i2c/i2c_result/enable
+    chmod 0666 /sys/kernel/debug/tracing/events/i2c/i2c_reply/enable
+    chmod 0666 /sys/kernel/tracing/events/i2c/i2c_reply/enable
+    chmod 0666 /sys/kernel/debug/tracing/events/i2c/smbus_read/enable
+    chmod 0666 /sys/kernel/tracing/events/i2c/smbus_read/enable
+    chmod 0666 /sys/kernel/debug/tracing/events/i2c/smbus_write/enable
+    chmod 0666 /sys/kernel/tracing/events/i2c/smbus_write/enable
+    chmod 0666 /sys/kernel/debug/tracing/events/i2c/smbus_result/enable
+    chmod 0666 /sys/kernel/tracing/events/i2c/smbus_result/enable
+    chmod 0666 /sys/kernel/debug/tracing/events/i2c/smbus_reply/enable
+    chmod 0666 /sys/kernel/tracing/events/i2c/smbus_reply/enable
+    chmod 0666 /sys/kernel/debug/tracing/events/lowmemorykiller/enable
+    chmod 0666 /sys/kernel/tracing/events/lowmemorykiller/enable
 
-    chown root shell /sys/kernel/debug/tracing/tracing_on
-    chown root shell /sys/kernel/tracing/tracing_on
-
-    chmod 0664 /sys/kernel/debug/tracing/trace_clock
-    chmod 0664 /sys/kernel/tracing/trace_clock
-    chmod 0664 /sys/kernel/debug/tracing/buffer_size_kb
-    chmod 0664 /sys/kernel/tracing/buffer_size_kb
-    chmod 0664 /sys/kernel/debug/tracing/options/overwrite
-    chmod 0664 /sys/kernel/tracing/options/overwrite
-    chmod 0664 /sys/kernel/debug/tracing/options/print-tgid
-    chmod 0664 /sys/kernel/tracing/options/print-tgid
-    chmod 0664 /sys/kernel/debug/tracing/saved_cmdlines_size
-    chmod 0664 /sys/kernel/tracing/saved_cmdlines_size
-    chmod 0664 /sys/kernel/debug/tracing/events/sched/sched_switch/enable
-    chmod 0664 /sys/kernel/tracing/events/sched/sched_switch/enable
-    chmod 0664 /sys/kernel/debug/tracing/events/sched/sched_wakeup/enable
-    chmod 0664 /sys/kernel/tracing/events/sched/sched_wakeup/enable
-    chmod 0664 /sys/kernel/debug/tracing/events/sched/sched_blocked_reason/enable
-    chmod 0664 /sys/kernel/tracing/events/sched/sched_blocked_reason/enable
-    chmod 0664 /sys/kernel/debug/tracing/events/sched/sched_cpu_hotplug/enable
-    chmod 0664 /sys/kernel/tracing/events/sched/sched_cpu_hotplug/enable
-    chmod 0664 /sys/kernel/debug/tracing/events/cgroup/enable
-    chmod 0664 /sys/kernel/tracing/events/cgroup/enable
-    chmod 0664 /sys/kernel/debug/tracing/events/power/cpu_frequency/enable
-    chmod 0664 /sys/kernel/tracing/events/power/cpu_frequency/enable
-    chmod 0664 /sys/kernel/debug/tracing/events/power/cpu_idle/enable
-    chmod 0664 /sys/kernel/tracing/events/power/cpu_idle/enable
-    chmod 0664 /sys/kernel/debug/tracing/events/power/clock_set_rate/enable
-    chmod 0664 /sys/kernel/tracing/events/power/clock_set_rate/enable
-    chmod 0664 /sys/kernel/debug/tracing/events/power/cpu_frequency_limits/enable
-    chmod 0664 /sys/kernel/tracing/events/power/cpu_frequency_limits/enable
-    chmod 0664 /sys/kernel/debug/tracing/events/cpufreq_interactive/enable
-    chmod 0664 /sys/kernel/tracing/events/cpufreq_interactive/enable
-    chmod 0664 /sys/kernel/debug/tracing/events/vmscan/mm_vmscan_direct_reclaim_begin/enable
-    chmod 0664 /sys/kernel/tracing/events/vmscan/mm_vmscan_direct_reclaim_begin/enable
-    chmod 0664 /sys/kernel/debug/tracing/events/vmscan/mm_vmscan_direct_reclaim_end/enable
-    chmod 0664 /sys/kernel/tracing/events/vmscan/mm_vmscan_direct_reclaim_end/enable
-    chmod 0664 /sys/kernel/debug/tracing/events/vmscan/mm_vmscan_kswapd_wake/enable
-    chmod 0664 /sys/kernel/tracing/events/vmscan/mm_vmscan_kswapd_wake/enable
-    chmod 0664 /sys/kernel/debug/tracing/events/vmscan/mm_vmscan_kswapd_sleep/enable
-    chmod 0664 /sys/kernel/tracing/events/vmscan/mm_vmscan_kswapd_sleep/enable
-    chmod 0664 /sys/kernel/debug/tracing/tracing_on
-    chmod 0664 /sys/kernel/tracing/tracing_on
-    chmod 0664 /sys/kernel/debug/tracing/events/binder/binder_transaction/enable
-    chmod 0664 /sys/kernel/tracing/events/binder/binder_transaction/enable
-    chmod 0664 /sys/kernel/debug/tracing/events/binder/binder_transaction_received/enable
-    chmod 0664 /sys/kernel/tracing/events/binder/binder_transaction_received/enable
-    chmod 0664 /sys/kernel/debug/tracing/events/binder/binder_lock/enable
-    chmod 0664 /sys/kernel/tracing/events/binder/binder_lock/enable
-    chmod 0664 /sys/kernel/debug/tracing/events/binder/binder_locked/enable
-    chmod 0664 /sys/kernel/tracing/events/binder/binder_locked/enable
-    chmod 0664 /sys/kernel/debug/tracing/events/binder/binder_unlock/enable
-    chmod 0664 /sys/kernel/tracing/events/binder/binder_unlock/enable
-    chmod 0664 /sys/kernel/debug/tracing/events/i2c/enable
-    chmod 0664 /sys/kernel/tracing/events/i2c/enable
-    chmod 0664 /sys/kernel/debug/tracing/events/i2c/i2c_read/enable
-    chmod 0664 /sys/kernel/tracing/events/i2c/i2c_read/enable
-    chmod 0664 /sys/kernel/debug/tracing/events/i2c/i2c_write/enable
-    chmod 0664 /sys/kernel/tracing/events/i2c/i2c_write/enable
-    chmod 0664 /sys/kernel/debug/tracing/events/i2c/i2c_result/enable
-    chmod 0664 /sys/kernel/tracing/events/i2c/i2c_result/enable
-    chmod 0664 /sys/kernel/debug/tracing/events/i2c/i2c_reply/enable
-    chmod 0664 /sys/kernel/tracing/events/i2c/i2c_reply/enable
-    chmod 0664 /sys/kernel/debug/tracing/events/i2c/smbus_read/enable
-    chmod 0664 /sys/kernel/tracing/events/i2c/smbus_read/enable
-    chmod 0664 /sys/kernel/debug/tracing/events/i2c/smbus_write/enable
-    chmod 0664 /sys/kernel/tracing/events/i2c/smbus_write/enable
-    chmod 0664 /sys/kernel/debug/tracing/events/i2c/smbus_result/enable
-    chmod 0664 /sys/kernel/tracing/events/i2c/smbus_result/enable
-    chmod 0664 /sys/kernel/debug/tracing/events/i2c/smbus_reply/enable
-    chmod 0664 /sys/kernel/tracing/events/i2c/smbus_reply/enable
-    chmod 0664 /sys/kernel/debug/tracing/events/lowmemorykiller/enable
-    chmod 0664 /sys/kernel/tracing/events/lowmemorykiller/enable
-
-    # Tracing disabled by default
+# Tracing disabled by default
     write /sys/kernel/debug/tracing/tracing_on 0
     write /sys/kernel/tracing/tracing_on 0
 
-# Allow only the shell group to read and truncate the kernel trace.
-    chown root shell /sys/kernel/debug/tracing/trace
-    chown root shell /sys/kernel/tracing/trace
-    chmod 0660 /sys/kernel/debug/tracing/trace
-    chmod 0660 /sys/kernel/tracing/trace
+# Read and truncate the kernel trace.
+    chmod 0666 /sys/kernel/debug/tracing/trace
+    chmod 0666 /sys/kernel/tracing/trace
 
 on property:persist.debug.atrace.boottrace=1
     start boottrace
diff --git a/cmds/atrace/atrace_userdebug.rc b/cmds/atrace/atrace_userdebug.rc
index 5fd28e2..9d632cc 100644
--- a/cmds/atrace/atrace_userdebug.rc
+++ b/cmds/atrace/atrace_userdebug.rc
@@ -1,47 +1,43 @@
 ## Permissions to allow additional system-wide tracing to the kernel trace buffer.
 ## The default list of permissions is set in frameworks/native/cmds/atrace/atrace.rc
 
-# Allow the shell group to enable kernel tracepoints:
+# Grant unix world read/write permissions to enable kernel tracepoints.
+# Access control to these files is now entirely in selinux policy.
 
 on post-fs
-    chown root shell /sys/kernel/debug/tracing/events/sync/enable
-    chown root shell /sys/kernel/debug/tracing/events/workqueue/enable
-    chown root shell /sys/kernel/debug/tracing/events/regulator/enable
-    chown root shell /sys/kernel/debug/tracing/events/pagecache/enable
+    chmod 0666 /sys/kernel/tracing/events/sync/enable
+    chmod 0666 /sys/kernel/debug/tracing/events/sync/enable
+    chmod 0666 /sys/kernel/tracing/events/workqueue/enable
+    chmod 0666 /sys/kernel/debug/tracing/events/workqueue/enable
+    chmod 0666 /sys/kernel/tracing/events/regulator/enable
+    chmod 0666 /sys/kernel/debug/tracing/events/regulator/enable
+    chmod 0666 /sys/kernel/tracing/events/pagecache/enable
+    chmod 0666 /sys/kernel/debug/tracing/events/pagecache/enable
 
     # irq
-    chown root shell /sys/kernel/debug/tracing/events/irq/enable
-    chown root shell /sys/kernel/debug/tracing/events/ipi/enable
+    chmod 0666 /sys/kernel/tracing/events/irq/enable
+    chmod 0666 /sys/kernel/debug/tracing/events/irq/enable
+    chmod 0666 /sys/kernel/tracing/events/ipi/enable
+    chmod 0666 /sys/kernel/debug/tracing/events/ipi/enable
 
     # disk
-    chown root shell /sys/kernel/debug/tracing/events/f2fs/f2fs_sync_file_enter/enable
-    chown root shell /sys/kernel/debug/tracing/events/f2fs/f2fs_sync_file_exit/enable
-    chown root shell /sys/kernel/debug/tracing/events/f2fs/f2fs_write_begin/enable
-    chown root shell /sys/kernel/debug/tracing/events/f2fs/f2fs_write_end/enable
-    chown root shell /sys/kernel/debug/tracing/events/ext4/ext4_da_write_begin/enable
-    chown root shell /sys/kernel/debug/tracing/events/ext4/ext4_da_write_end/enable
-    chown root shell /sys/kernel/debug/tracing/events/ext4/ext4_sync_file_enter/enable
-    chown root shell /sys/kernel/debug/tracing/events/ext4/ext4_sync_file_exit/enable
-    chown root shell /sys/kernel/debug/tracing/events/block/block_rq_issue/enable
-    chown root shell /sys/kernel/debug/tracing/events/block/block_rq_complete/enable
-
-    chmod 0664 /sys/kernel/debug/tracing/events/sync/enable
-    chmod 0664 /sys/kernel/debug/tracing/events/workqueue/enable
-    chmod 0664 /sys/kernel/debug/tracing/events/regulator/enable
-    chmod 0664 /sys/kernel/debug/tracing/events/pagecache/enable
-
-    # irq
-    chmod 0664 /sys/kernel/debug/tracing/events/irq/enable
-    chmod 0664 /sys/kernel/debug/tracing/events/ipi/enable
-
-    # disk
-    chmod 0664 /sys/kernel/debug/tracing/events/f2fs/f2fs_sync_file_enter/enable
-    chmod 0664 /sys/kernel/debug/tracing/events/f2fs/f2fs_sync_file_exit/enable
-    chmod 0664 /sys/kernel/debug/tracing/events/f2fs/f2fs_write_begin/enable
-    chmod 0664 /sys/kernel/debug/tracing/events/f2fs/f2fs_write_end/enable
-    chmod 0664 /sys/kernel/debug/tracing/events/ext4/ext4_da_write_begin/enable
-    chmod 0664 /sys/kernel/debug/tracing/events/ext4/ext4_da_write_end/enable
-    chmod 0664 /sys/kernel/debug/tracing/events/ext4/ext4_sync_file_enter/enable
-    chmod 0664 /sys/kernel/debug/tracing/events/ext4/ext4_sync_file_exit/enable
-    chmod 0664 /sys/kernel/debug/tracing/events/block/block_rq_issue/enable
-    chmod 0664 /sys/kernel/debug/tracing/events/block/block_rq_complete/enable
+    chmod 0666 /sys/kernel/tracing/events/f2fs/f2fs_sync_file_enter/enable
+    chmod 0666 /sys/kernel/debug/tracing/events/f2fs/f2fs_sync_file_enter/enable
+    chmod 0666 /sys/kernel/tracing/events/f2fs/f2fs_sync_file_exit/enable
+    chmod 0666 /sys/kernel/debug/tracing/events/f2fs/f2fs_sync_file_exit/enable
+    chmod 0666 /sys/kernel/tracing/events/f2fs/f2fs_write_begin/enable
+    chmod 0666 /sys/kernel/debug/tracing/events/f2fs/f2fs_write_begin/enable
+    chmod 0666 /sys/kernel/tracing/events/f2fs/f2fs_write_end/enable
+    chmod 0666 /sys/kernel/debug/tracing/events/f2fs/f2fs_write_end/enable
+    chmod 0666 /sys/kernel/tracing/events/ext4/ext4_da_write_begin/enable
+    chmod 0666 /sys/kernel/debug/tracing/events/ext4/ext4_da_write_begin/enable
+    chmod 0666 /sys/kernel/tracing/events/ext4/ext4_da_write_end/enable
+    chmod 0666 /sys/kernel/debug/tracing/events/ext4/ext4_da_write_end/enable
+    chmod 0666 /sys/kernel/tracing/events/ext4/ext4_sync_file_enter/enable
+    chmod 0666 /sys/kernel/debug/tracing/events/ext4/ext4_sync_file_enter/enable
+    chmod 0666 /sys/kernel/tracing/events/ext4/ext4_sync_file_exit/enable
+    chmod 0666 /sys/kernel/debug/tracing/events/ext4/ext4_sync_file_exit/enable
+    chmod 0666 /sys/kernel/tracing/events/block/block_rq_issue/enable
+    chmod 0666 /sys/kernel/debug/tracing/events/block/block_rq_issue/enable
+    chmod 0666 /sys/kernel/tracing/events/block/block_rq_complete/enable
+    chmod 0666 /sys/kernel/debug/tracing/events/block/block_rq_complete/enable