linux-kernel - Re: [PATCH][RFC] Adding information of counts processes acquired how many spinlocks to schedstat

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Message-Id: <1247405045.6733.2.camel@laptop>
Date:	Sun, 12 Jul 2009 15:24:05 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Hitoshi Mitake <mitake@....info.waseda.ac.jp>
Cc:	andi@...stfloor.org, fweisbec@...il.com, mingo@...e.hu,
	acme@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][RFC] Adding information of counts processes acquired
 how many spinlocks to schedstat

On Sun, 2009-07-12 at 16:23 +0900, Hitoshi Mitake wrote:

> Thanks, I understood your advice. Using infrastructure of ftrace is good idea, so I'll use it.
> 
> But I have a question.
> I can't enable CONFIG_EVENT_PROFILE because it depends on CONFIG_EVENT_TRACER.
> And CONFIG_EVENT_TRACER seems something never enabled.
> 
> % git grep EVENT_TRACER
> arch/arm/configs/cm_x300_defconfig:# CONFIG_EVENT_TRACER is not set
> arch/arm/configs/davinci_all_defconfig:# CONFIG_EVENT_TRACER is not set
> arch/arm/configs/ep93xx_defconfig:# CONFIG_EVENT_TRACER is not set
> ....
> arch/x86/configs/i386_defconfig:# CONFIG_EVENT_TRACER is not set
> arch/x86/configs/x86_64_defconfig:# CONFIG_EVENT_TRACER is not set
> init/Kconfig:   depends on PERF_COUNTERS && EVENT_TRACER
> 
> In addition, this is the output of searching this on menuconfig
>     Symbol: EVENT_TRACER [=EVENT_TRACER]          
> and, there is a log in git
> 
> commit a7abe97fd8e7a6ccabba5a04a9f17be9211d418c
> Author: Steven Rostedt <srostedt@...hat.com>
> Date:   Mon Apr 20 10:59:34 2009 -0400
> 
>     tracing: rename EVENT_TRACER config to ENABLE_EVENT_TRACING
> 
>     Currently we have two configs: EVENT_TRACING and EVENT_TRACER.
>     All tracers enable EVENT_TRACING. The EVENT_TRACER is only a
>     convenience to enable the EVENT_TRACING when no other tracers
>     are enabled.
> 
> Does EVENT_TRACER make any sense?
> If doesn't, can I remove dependency of CONFIG_EVENT_PROFILE?

Yeah, steve broke it, but then Jason fixed it again, but his patches
might not have made it in yet.

  http://lkml.org/lkml/2009/7/6/313

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