diff --git a/cmds/atrace/atrace.cpp b/cmds/atrace/atrace.cpp
index f0a52d8..a3d210a 100644
--- a/cmds/atrace/atrace.cpp
+++ b/cmds/atrace/atrace.cpp
@@ -106,14 +106,14 @@
         { REQ,      "/sys/kernel/debug/tracing/events/power/cpu_idle/enable" },
     } },
     { "disk",       "Disk I/O",         0, {
-        { REQ,      "/sys/kernel/debug/tracing/events/f2fs/f2fs_sync_file_enter/enable" },
-        { REQ,      "/sys/kernel/debug/tracing/events/f2fs/f2fs_sync_file_exit/enable" },
-        { REQ,      "/sys/kernel/debug/tracing/events/f2fs/f2fs_write_begin/enable" },
-        { REQ,      "/sys/kernel/debug/tracing/events/f2fs/f2fs_write_end/enable" },
-        { REQ,      "/sys/kernel/debug/tracing/events/ext4/ext4_da_write_begin/enable" },
-        { REQ,      "/sys/kernel/debug/tracing/events/ext4/ext4_da_write_end/enable" },
-        { REQ,      "/sys/kernel/debug/tracing/events/ext4/ext4_sync_file_enter/enable" },
-        { REQ,      "/sys/kernel/debug/tracing/events/ext4/ext4_sync_file_exit/enable" },
+        { OPT,      "/sys/kernel/debug/tracing/events/f2fs/f2fs_sync_file_enter/enable" },
+        { OPT,      "/sys/kernel/debug/tracing/events/f2fs/f2fs_sync_file_exit/enable" },
+        { OPT,      "/sys/kernel/debug/tracing/events/f2fs/f2fs_write_begin/enable" },
+        { OPT,      "/sys/kernel/debug/tracing/events/f2fs/f2fs_write_end/enable" },
+        { OPT,      "/sys/kernel/debug/tracing/events/ext4/ext4_da_write_begin/enable" },
+        { OPT,      "/sys/kernel/debug/tracing/events/ext4/ext4_da_write_end/enable" },
+        { OPT,      "/sys/kernel/debug/tracing/events/ext4/ext4_sync_file_enter/enable" },
+        { OPT,      "/sys/kernel/debug/tracing/events/ext4/ext4_sync_file_exit/enable" },
         { REQ,      "/sys/kernel/debug/tracing/events/block/block_rq_issue/enable" },
         { REQ,      "/sys/kernel/debug/tracing/events/block/block_rq_complete/enable" },
     } },