linux-kernel - Re: [PATCH -tip 2/2] kprobetrace, doc: Add the explanation to remove probe points

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Date:	Mon, 18 Jan 2010 23:22:27 -0500
From:	Masami Hiramatsu <mhiramat@...hat.com>
To:	Masami Hiramatsu <mhiramat@...hat.com>
CC:	Ingo Molnar <mingo@...e.hu>, lkml <linux-kernel@...r.kernel.org>,
	systemtap <systemtap@...rces.redhat.com>,
	DLE <dle-develop@...ts.sourceforge.net>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Subject: Re: [PATCH -tip 2/2] kprobetrace,	doc: Add the explanation to remove
 probe points

Masami Hiramatsu wrote:
> From: Motohiro KOSAKI <kosaki.motohiro@...fujitsu.com>
> 
> Latest kprobetrace can remove probe points selectively. thus
> documentation should be updated too.
> 
> Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>

Signed-off-by: Masami Hiramatsu <mhiramat@...hat.com>

Since I've delivered this patch.:-)

> ---
> 
>  Documentation/trace/kprobetrace.txt |    7 +++++++
>  1 files changed, 7 insertions(+), 0 deletions(-)
> 
> diff --git a/Documentation/trace/kprobetrace.txt b/Documentation/trace/kprobetrace.txt
> index ab57f02..a9100b2 100644
> --- a/Documentation/trace/kprobetrace.txt
> +++ b/Documentation/trace/kprobetrace.txt
> @@ -24,6 +24,7 @@ Synopsis of kprobe_events
>  -------------------------
>    p[:[GRP/]EVENT] SYMBOL[+offs]|MEMADDR [FETCHARGS]	: Set a probe
>    r[:[GRP/]EVENT] SYMBOL[+0] [FETCHARGS]		: Set a return probe
> +  -:[GRP/]EVENT						: Clear a probe
>  
>   GRP		: Group name. If omitted, use "kprobes" for it.
>   EVENT		: Event name. If omitted, the event name is generated
> @@ -122,6 +123,12 @@ REC->dfd, REC->filename, REC->flags, REC->mode
>  
>   This clears all probe points.
>  
> + Or,
> +
> +  echo -:myprobe >> kprobe_events
> +
> + This clears probe points selectively.
> +
>   Right after definition, each event is disabled by default. For tracing these
>  events, you need to enable it.
>  
> 
> --
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-- 
Masami Hiramatsu

Software Engineer
Hitachi Computer Products (America), Inc.
Software Solutions Division

e-mail: mhiramat@...hat.com

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