Re: [PATCH][RFC] Adding information of counts processes acquiredhow many spinlocks to schedstat

[Hitoshi Mitake]

From: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Subject: Re: [PATCH][RFC] Adding information of counts processes acquired how many spinlocks to schedstat
Date: Sun, 12 Jul 2009 15:24:05 +0200

> 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@xxxxxxxxxx>
> > 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
> 
> 

Wow! I can obtain lock_acquire with Jason's patch,

% perf stat -e lockdep:lock_acquire sleep 1

 Performance counter stats for 'sleep 1':

           1420  lockdep:lock_acquire

    1.004953591  seconds time elapsed

I wanted this.
So I don't have nothing to do.., but thanks Jason!
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