linux-kernel - Re: [PATCH] ftrace: update txt document

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Date:	Fri, 31 Oct 2008 08:30:07 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [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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