I have enabled the `CONFIG_DYNAMIC_DEBUG` flag in kernel config file. when I boot in my system I am able to mount the`/sys/kernel/debug` and there is `dynamic_debug/control` file too.

But when I issue any command like

```
echo -n 'module nfsd +p' > <debugfs>/dynamic_debug/control

```

it does not shows any output in `dmesg` OR `syslogd`. What am I doing wrong?