linux-kernel - Re: [PATCH 2/2][RFC] tracing: Add extract out softirq names used by irq trace events

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Date:	Sat, 13 Feb 2010 11:39:09 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Mathieu Desnoyers <compudj@...stal.dyndns.org>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Li Zefan <lizf@...fujitsu.com>, Christoph Hellwig <hch@....de>,
	Wu Fengguang <fengguang.wu@...el.com>
Subject: Re: [PATCH 2/2][RFC] tracing: Add extract out softirq names used
 by irq trace events

On Fri, 2010-02-12 at 14:09 -0500, Steven Rostedt wrote:
> plain text document attachment (irq-events.patch)
> The irq trace events that map the softirq vectors to strings
> shows up in the format files as names. To allow binary parsers to
> be able to convert these names to their actual numbers, this patch
> extracts those enums.
> 
> Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
> 
> ---
>  include/trace/events/irq.h |   11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> Index: linux-trace.git/include/trace/events/irq.h
> ===================================================================
> --- linux-trace.git.orig/include/trace/events/irq.h	2010-02-12 13:29:44.000000000 -0500
> +++ linux-trace.git/include/trace/events/irq.h	2010-02-12 13:33:20.000000000 -0500
> @@ -7,6 +7,17 @@
>  #include <linux/tracepoint.h>
>  #include <linux/interrupt.h>
>  
> +EXTRACT_TRACE_SYMBOL(HI_SOFTIRQ);
> +EXTRACT_TRACE_SYMBOL(TIMER_SOFTIRQ);
> +EXTRACT_TRACE_SYMBOL(NET_TX_SOFTIRQ);
> +EXTRACT_TRACE_SYMBOL(NET_RX_SOFTIRQ);
> +EXTRACT_TRACE_SYMBOL(BLOCK_SOFTIRQ);
> +EXTRACT_TRACE_SYMBOL(BLOCK_IOPOLL_SOFTIRQ);
> +EXTRACT_TRACE_SYMBOL(TASKLET_SOFTIRQ);
> +EXTRACT_TRACE_SYMBOL(SCHED_SOFTIRQ);
> +EXTRACT_TRACE_SYMBOL(HRTIMER_SOFTIRQ);
> +EXTRACT_TRACE_SYMBOL(RCU_SOFTIRQ);
> +

Still sucks you have to explicitly iterate them all, and far away from
the actual definition site too, its just asking to get out of whack with
reality.
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