linux-kernel - Re: [patch 08/17] LTTng instrumentation

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Date:	Thu, 24 Jul 2008 09:57:53 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
cc:	akpm@...ux-foundation.org, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org,
	Peter Zijlstra <peterz@...radead.org>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Hideo AOKI <haoki@...hat.com>,
	Takashi Nishiie <t-nishiie@...css.fujitsu.com>,
	Eduard - Gabriel Munteanu <eduard.munteanu@...ux360.ro>
Subject: Re: [patch 08/17] LTTng instrumentation - kernel



On Tue, 15 Jul 2008, Mathieu Desnoyers wrote:
>
>  /*
>   * Low level drivers may need that to know if they can schedule in
> @@ -601,6 +603,7 @@ asmlinkage int printk(const char *fmt, .
>  	int r;
>
>  	va_start(args, fmt);
> +	trace_kernel_printk(__builtin_return_address(0));

BTW, ftrace.h has macros that let you use CALLER_ADDR0 for
__builtin_return_address. It also converts it from a pointer to a long,
but makes the code look prettier.


>  	r = vprintk(fmt, args);
>  	va_end(args);
>
> @@ -677,6 +680,9 @@ asmlinkage int vprintk(const char *fmt,
>  	raw_local_irq_save(flags);
>  	this_cpu = smp_processor_id();
>
> +	trace_kernel_vprintk(__builtin_return_address(0),
> +		printk_buf, printed_len);
> +
>  	/*
>  	 * Ouch, printk recursed into itself!
>  	 */

-- Steve

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