linux-kernel - Re: Tracing configuration review

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Date:	Tue, 8 Jun 2010 10:35:17 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Chase Douglas <chase.douglas@...onical.com>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Prasad <prasad@...ux.vnet.ibm.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Eduard - Gabriel Munteanu <eduard.munteanu@...ux360.ro>,
	Soeren Sandmann <sandmann@...mi.au.dk>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Subject: Re: Tracing configuration review

On Tue, 25 May 2010 17:09:59 -0400 Chase Douglas wrote:

> On Tue, 2010-05-25 at 22:13 +0200, Frederic Weisbecker wrote:
> > On Tue, May 25, 2010 at 03:31:46PM -0400, Chase Douglas wrote:
> > > The following options are what I am looking to set for our x86
> > > configurations. I've only included those that I am not 100% sure of.
> > > Comments are what I could gather from documentation and Kconfig, but
> > > they may not be accurate:
> 
> <snip>
> 
> > > # CONFIG_SCHED_TRACER is not set (headed for deprecation?)
> > 
> > 
> > We want to deprecate it in the long term, but for now we
> > don't have any replacement. Cool for RT latency tracing.
> 
> I thought that the functionality is the same as what you get by:
> 
> echo 1 > (debufs)/tracing/events/sched/enable
> 
> > > CONFIG_KSYM_TRACER=y (no performance impact by default)
> > 
> > 
> > IMO, it is deprecated. The perf interface is much more powerful and flexible.
> > Prasad, do you agree if I remove this ftrace plugin?
> 
> If there isn't any use in enabling it due to perf's features, then we
> can turn it off. However, if there's any use to be gained by this over
> perf's features, then I'd prefer to leave it on. Thoughts?
> 
> 
> > > CONFIG_WORKQUEUE_TRACER=y (no performance impact by default)
> > 
> > 
> > In the way for deprecation.
> 
> Is this like the KMEM_TRACER where trace events have superseded it?


Hi Chase,

Would you mind sharing your final tracing config options?

thanks,
---
~Randy
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