linux-kernel - Re: [PATCH] Linux Kernel Markers 0.2 for Linux 2.6.17

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Message-ID: <20060919193623.GA9459@Krystal>
Date:	Tue, 19 Sep 2006 15:36:24 -0400
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	"Frank Ch. Eigler" <fche@...hat.com>
Cc:	linux-kernel@...r.kernel.org,
	Christoph Hellwig <hch@...radead.org>,
	Andrew Morton <akpm@...l.org>, Ingo Molnar <mingo@...hat.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Douglas Niehaus <niehaus@...s.ku.edu>,
	Tom Zanussi <zanussi@...ibm.com>,
	Paul Mundt <lethal@...ux-sh.org>, Jes Sorensen <jes@....com>,
	Richard J Moore <richardj_moore@...ibm.com>,
	William Cohen <wcohen@...hat.com>,
	"Martin J. Bligh" <mbligh@...igh.org>,
	Michel Dagenais <michel.dagenais@...ymtl.ca>,
	systemtap@...rces.redhat.com, ltt-dev@...fik.org
Subject: Re: [PATCH] Linux Kernel Markers 0.2 for Linux 2.6.17

* Frank Ch. Eigler (fche@...hat.com) wrote:
> If you don't allow yourself to presume on-the-fly function
> recompilation, then these markers would need to be made run-time
> rather than compile-time configurable.  That is, not like this:
> 
> > +/* Menu configured markers */
> > +#ifndef CONFIG_MARK
> > +#define MARK	MARK_INACTIVE
> > +#elif defined(CONFIG_MARK_PRINT)
> > +#define MARK	MARK_PRINT
> > +#elif defined(CONFIG_MARK_FPROBE)
> > +#define MARK	MARK_FPROBE
> > +#elif defined(CONFIG_MARK_KPROBE)
> > +#define MARK	MARK_KPROBE
> > +#elif defined(CONFIG_MARK_JPROBE)
> > +#define MARK	MARK_JPROBE
> > +#endif

By making them run-time configurable, I don't see any whay not to bloat the
kernel. How can be embed calls to printk+function+kprobe+djprobe without
having some kind of performance impact ?

Do you have any suggestion for this ? (or maybe am I missing your point ?)

Mathieu


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