linux-kernel - Re: [PATCH] tracing: Increase stack skip on event trigger

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Message-ID: <20150413180606.3cc13a7d@gandalf.local.home>
Date:	Mon, 13 Apr 2015 18:06:06 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Tom Zanussi <tom.zanussi@...ux.intel.com>,
	Minchan Kim <minchan@...nel.org>
Subject: Re: [PATCH] tracing: Increase stack skip on event trigger

On Thu, 26 Mar 2015 09:39:23 +0900
Namhyung Kim <namhyung@...nel.org> wrote:

> When 'stacktrace' trigger is used for event tracing, it should skip 4
> functions instead of 3.  Otherwise it'll contain ftrace_raw_event_XXX
> like below:
> 
>   # echo stacktrace > events/sched/sched_switch/trigger
>   # tail trace
>    => rcu_gp_kthread
>    => kthread
>    => ret_from_fork
>        ksoftirqd/0-3     [000] d..3    53.343993: <stack trace>
>    => ftrace_raw_event_sched_switch
>    => __schedule
>    => schedule
>    => smpboot_thread_fn
>    => kthread
>    => ret_from_fork
> 
> Reported-by: Minchan Kim <minchan@...nel.org>
> Cc: Tom Zanussi <tom.zanussi@...ux.intel.com>
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> ---

Hmm, this breaks when frame pointers are not enabled.

I may come up with something though.

-- Steve
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