linux-kernel - Re: [RFC][PATCH 0/2] tracing: Have trace

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Date:	Thu, 18 Nov 2010 11:41:06 +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>,
	Darren Hart <dvhart@...ux.intel.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"jason.wessel" <jason.wessel@...driver.com>,
	Ted Ts'o <tytso@....edu>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Subject: Re: [RFC][PATCH 0/2] tracing: Have trace_printk()s in the events/
 directory

On Wed, 2010-11-17 at 22:58 -0500, Steven Rostedt wrote:
> For example, I added a trace_printk() in kernel/sched.c at line 2180
> and it creates:
> 
> # ls /debug/tracing/events/printk/kernel/sched.c/2180/
> enable  format
> 
> The format is the printk format:
> 
> # cat /debug/tracing/events/printk/kernel/sched.c/2180/format 
> "migrate task %s:%d"

*groan*, so you're creating a tracepoint per instance?

That's going to be massive pain for perf.. I really don't see the point
in splitting all that out.
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