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

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Message-ID: <20130715182012.GB18505@redhat.com>
Date:	Mon, 15 Jul 2013 20:20:12 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	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 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().

Oleg.

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