linux-kernel - Re: [PATCHv2] tracing: let user specify tracing_thresh after selecting function

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Message-ID: <20140715090436.1d660119@gandalf.local.home>
Date:	Tue, 15 Jul 2014 09:04:36 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Stanislav Fomichev <stfomichev@...dex-team.ru>
Cc:	fweisbec@...il.com, mingo@...hat.com, jovi.zhangwei@...wei.com,
	namhyung.kim@....com, tom.zanussi@...ux.intel.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCHv2] tracing: let user specify tracing_thresh after
 selecting function_graph

On Tue, 15 Jul 2014 13:27:19 +0400
Stanislav Fomichev <stfomichev@...dex-team.ru> wrote:

> Hi Steven,
> 
> Did you have some spare time to check why I'm getting triple fault with the
> jump labels inside function tracers? Or will you just pull my another
> patch without them?

No, I don't want the overhead of that check if it isn't needed. You
don't need to put a jump label in there either.

Just create another ftrace_ops function that we can update that does
the check when the function is needed. Look at what happens when
someone sets the set_ftrace_pid file.

-- Steve
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