linux-kernel - Re: [PATCH 4/8] tracing/function: Introduce persistent trace option

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Date:	Tue, 10 Jul 2012 08:58:56 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Anton Vorontsov <anton.vorontsov@...aro.org>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Kees Cook <keescook@...omium.org>,
	Colin Cross <ccross@...roid.com>,
	Tony Luck <tony.luck@...el.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>, Arnd Bergmann <arnd@...db.de>,
	John Stultz <john.stultz@...aro.org>,
	Shuah Khan <shuahkhan@...il.com>, arve@...roid.com,
	Rebecca Schultz Zavin <rebecca@...roid.com>,
	Jesper Juhl <jj@...osbits.net>,
	Randy Dunlap <rdunlap@...otime.net>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Thomas Meyer <thomas@...3r.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Marco Stornelli <marco.stornelli@...il.com>,
	WANG Cong <xiyou.wangcong@...il.com>,
	linux-kernel@...r.kernel.org, devel@...verdev.osuosl.org,
	linaro-kernel@...ts.linaro.org, patches@...aro.org,
	kernel-team@...roid.com
Subject: Re: [PATCH 4/8] tracing/function: Introduce persistent trace option

On Mon, 2012-07-09 at 17:10 -0700, Anton Vorontsov wrote:

> +static struct tracer_flags func_flags;
> +
>  static void
>  function_trace_call(unsigned long ip, unsigned long parent_ip)
>  {
> @@ -97,6 +106,12 @@ function_trace_call(unsigned long ip, unsigned long parent_ip)
>  	disabled = atomic_inc_return(&data->disabled);
>  
>  	if (likely(disabled == 1)) {
> +		/*
> +		 * So far tracing doesn't support multiple buffers, so
> +		 * we make an explicit call for now.

I'm working on it ;-)

-- Steve

> +		 */
> +		if (unlikely(func_flags.val & TRACE_FUNC_OPT_PSTORE))
> +			pstore_ftrace_call(ip, parent_ip);
>  		pc = preempt_count();
>  		trace_function(tr, ip, parent_ip, flags, pc);
>  	}


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