linux-kernel - Re: [ltt-dev] [RFC patch 29/41] LTTng menus

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Date:	Thu, 5 Mar 2009 19:01:55 -0500
From:	Mathieu Desnoyers <compudj@...stal.dyndns.org>
To:	Randy Dunlap <randy.dunlap@...cle.com>
Cc:	mrubin@...gle.com, Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Pekka Paalanen <pq@....fi>, "H. Peter Anvin" <hpa@...or.com>,
	md@...gle.com, Tom Zanussi <tzanussi@...il.com>,
	Christoph Hellwig <hch@...radead.org>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	ltt-dev@...ts.casi.polymtl.ca,
	Eduard - Gabriel Munteanu <eduard.munteanu@...ux360.ro>,
	Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Arjan van de Ven <arjan@...radead.org>,
	linux-kernel@...r.kernel.org, Martin Bligh <mbligh@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [ltt-dev] [RFC patch 29/41] LTTng menus

* Randy Dunlap (randy.dunlap@...cle.com) wrote:
> Mathieu Desnoyers wrote:
> > * Randy Dunlap (randy.dunlap@...cle.com) wrote:
> >> Mathieu Desnoyers wrote:
> >>
> >> <<attachment :(>>
> >>
> >>
> >> +menuconfig LTT
> >> +	bool "Linux Trace Toolkit Next Generation (LTTng)"
> >> +	depends on EXPERIMENTAL
> >> +	select MARKERS
> >> +	select TRACEPOINTS
> >> +	default y
> >>
> >> Not default 'y', please.
> >>
> > 
> > OK, so default n it is. But I plan to leave the main menu "sub-features" as
> > default y, given that people get the standard features when they choose
> > to enable the tracer. Hopefully this is ok ?
> 
> Sure, as long as it just enables viewing the menu and not adding
> code to a growing kernel.
> 

I want to be sure to understand your point. Would be following be OK ?

Menu [ ] Linux Trace Toolkit Next Generation (LTTng)  --->  (default n)

Within this menu, the following options enable various tracer modules,
some of which are typically needed, except in some very specific tracer
use :

< >   Linux Trace Toolkit Lock-Protected Data Relay (default n)
               (default y is planned to be used for the lockless data
               relay module, which is not posted as part of this patchset)
[ ]   Debug check for random access in ltt relay buffers (default n)
<*>   Linux Trace Toolkit Serializer (default y)
-*-   Linux Trace Toolkit Custom Serializer (default y)
-*-   Linux Trace Toolkit Trace Controller (default m)
<*>   Linux Trace Toolkit Tracer (default y)
[ ]   Align Linux Trace Toolkit Traces (default n, selected of
        !HAVE_EFFICIENT_UNALIGNED_ACCESS)
[ ]   Add event size field to LTT events for tracer debugging (default n)
<M>   Support logging events from userspace (default m)
[*]   Support trace extraction from crash dump (default y)
[*]   Linux Trace Toolkit Kprobes Support (default y)

I understand from your answer above that just enabling the "LTTng"
submenu should not activate any of these items, am I correct ?

Mathieu

-- 
Mathieu Desnoyers
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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