linux-kernel - Re: [RFC PATCH V2] tracing/kprobe: Wait for disabling all running kprobe handlers

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Date:	Thu, 18 Jul 2013 10:35:53 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Frederic Weisbecker <fweisbec@...il.com>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	jovi.zhangwei@...wei.com, Jiri Olsa <jolsa@...hat.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Subject: Re: [RFC PATCH V2] tracing/kprobe: Wait for disabling all running
 kprobe handlers

On Thu, 2013-07-18 at 21:07 +0900, Masami Hiramatsu wrote:
> (2013/07/16 3:20), Oleg Nesterov wrote:
> > On 07/09, Masami Hiramatsu wrote:
> >>
> >> Wait for disabling all running kprobe handlers when a kprobe
> >> event is disabled, since the caller, trace_remove_event_call()
> >> supposes that a removing event is disabled completely by
> >> disabling the event.
> >> With this change, ftrace can ensure that there is no running
> >> event handlers after disabling it.
> >>
> >> Changes in V2:
> >>  - Comment (in code) for clarify why we need to wait there.
> >>
> >> Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
> > 
> > Agreed.
> > 
> > We need this change in any case, whatever we do in trace/trace_events.c
> > and in unregister_trace_probe().
> 
> Steven, I think this patch is still needed anyway even if we are
> discussing file handling bugs, because this fixes another timing bug.

Sure, I'll pull that into my queue now.

-- Steve


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