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SubjectRe: [PATCH] ftrace: update txt document
Steven Rostedt wrote:
> I finally got around to looking at the review notes.
>
> On Sun, 26 Oct 2008, Randy Dunlap wrote:
>>>
>>> # sysctl kernel.ftrace_enabled=1
>>> - # echo ftrace > /debug/tracing/current_tracer
>>> + # echo function > /debug/tracing/current_tracer
>>> # echo 1 > /debug/tracing/tracing_enabled
>>> # usleep 1
>>> # echo 0 > /debug/tracing/tracing_enabled
>>> # cat /debug/tracing/trace
>>> -# tracer: ftrace
>>> +# tracer: function
>>> #
>>> # TASK-PID CPU# TIMESTAMP FUNCTION
>>> # | | | | |
>> General comment #2: debugfs is normally mounted at /sys/kernel/debug
>> (which Doc/x86/pat.txt, Doc/filesystems/relay.txt,
>> Doc/infiniband/ipoib.txt, and Doc/usb/usbmon.txt know about).
>> Please either use /sys/kernel/debug or use what Doc/kernel-parameters.txt
>> uses: <debugfs> (for the mount point). I.e., don't use a poor example
>> in the doc text.
>
> In the beginning of the document I did have a disclaimer:

OK, sorry about that. Somehow I missed seeing it.

> ------------------------
> To mount the debugfs system:
>
> # mkdir /debug
> # mount -t debugfs nodev /debug
>
> (Note: it is more common to mount at /sys/kernel/debug, but for simplicity
> this document will use /debug)
> ------------------------
>
> I know the recommended place is /sys/kernel/debug, but I never use it. And
> I know many others that do not either. It is just easier to make the
> /debug directory. I feel this is more of a guideline than something
> that must be enforced. But if you do feel strongly on this subject, I
> can change it to /sys/kernel/debug (which I absolutely loathe).


--
~Randy


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