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Re: [PATCH -tip 2/2] kprobetrace, doc: Add the explanation to remove probe points
- From: Masami Hiramatsu <mhiramat at redhat dot com>
- To: Masami Hiramatsu <mhiramat at redhat dot com>
- Cc: Ingo Molnar <mingo at elte dot hu>, lkml <linux-kernel at vger dot kernel dot org>, systemtap <systemtap at sources dot redhat dot com>, DLE <dle-develop at lists dot sourceforge dot net>, KOSAKI Motohiro <kosaki dot motohiro at jp dot fujitsu dot com>
- Date: Mon, 18 Jan 2010 23:22:27 -0500
- Subject: Re: [PATCH -tip 2/2] kprobetrace, doc: Add the explanation to remove probe points
- References: <20100117071411.GD19512@elte.hu> <20100119023512.31880.35535.stgit@localhost6.localdomain6>
Masami Hiramatsu wrote:
> From: Motohiro KOSAKI <kosaki.motohiro@jp.fujitsu.com>
>
> Latest kprobetrace can remove probe points selectively. thus
> documentation should be updated too.
>
> Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Masami Hiramatsu <mhiramat@redhat.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@redhat.com