Re: [RFC][PATCH 0/2] tracing: Have trace_printk()s in the events/
directory
[Posted November 23, 2010 by corbet]
| From: |
| Peter Zijlstra <peterz-AT-infradead.org> |
| To: |
| Steven Rostedt <rostedt-AT-goodmis.org> |
| Subject: |
| Re: [RFC][PATCH 0/2] tracing: Have trace_printk()s in the events/
directory |
| Date: |
| Thu, 18 Nov 2010 11:41:06 +0100 |
| Message-ID: |
| <1290076866.2109.1305.camel@laptop> |
| Cc: |
| linux-kernel-AT-vger.kernel.org, Ingo Molnar <mingo-AT-elte.hu>,
Andrew Morton <akpm-AT-linux-foundation.org>,
Thomas Gleixner <tglx-AT-linutronix.de>,
Frederic Weisbecker <fweisbec-AT-gmail.com>,
Darren Hart <dvhart-AT-linux.intel.com>,
Linus Torvalds <torvalds-AT-linux-foundation.org>,
"jason.wessel" <jason.wessel-AT-windriver.com>,
Ted Ts'o <tytso-AT-mit.edu>,
Mathieu Desnoyers <mathieu.desnoyers-AT-efficios.com> |
| Archive-link: |
| Article, Thread
|
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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