linux-kernel - Re: [PATCH] tracing/markers: make markers select tracepoints

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Date:	Sun, 22 Feb 2009 12:23:55 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	kosaki.motohiro@...fujitsu.com,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	linux-kernel@...r.kernel.org, zippel@...ux-m68k.org,
	linux-kbuild@...r.kernel.org, "Frank Ch. Eigler" <fche@...hat.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Subject: Re: [PATCH] tracing/markers: make markers select tracepoints

Hi

(cc to Frank and Mathieu)

> > >  config MARKERS
> > >  	bool "Activate markers"
> > > -	depends on TRACEPOINTS
> > > +	select TRACEPOINTS
> > >  	help
> > >  	  Place an empty function call at each marker site. Can be
> > >  	  dynamically changed for a probe function.
> > 
> > but using "select" instead of "depends on" just causes the 
> > kind of problem that you described, whereas using "depends on" 
> > does follow dependency chains.
> 
> Well, as long as the secondary selects are 'expanded' along the 
> line of dependencies, it should still be fine. With an 
> increasing number of dependencies it quickly becomes ugly 
> though. This might be one of the cases where it works.
> 
> Eventually we should eliminate markers, their uses can either be 
> converted to new-style tracepoints, or to ftrace_printk().

IIRC, this suggestion still don't get agreement of all tracing feature stakeholder.
We need to definitely discuss more lot and deep.
so I wonder why don't we create linux-tracing new mailing list.

tracer feature perfectly have new ML creation condition
  - very active development
  - many stakeholder and developer
  - use many common parts (eg, marker, kprobe, unified buffer)




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