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

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Message-ID: <y0m4pv3ek49.fsf@ton.toronto.redhat.com>
Date:	19 Sep 2006 15:23:18 -0400
From:	fche@...hat.com (Frank Ch. Eigler)
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
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


Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca> writes:

> Following some very interesting ideas from Martin that shows that
> even static function calls and inlined functions can be used in
> interesting ways with markers to deploy dynamic tracers with easy
> access to local function variables [...]

While that has been an interesting idea, its implementation would need
to be sketched out far beyond the speculative, in order to override
what I perceive as the rough consensus reached during earlier in the
thread.

> [...]  These last emails convince me even more that a markup
> mechanism must interface with every kind of instrumentation hooking
> we can think about, both dynamic and static. [...]

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

- FChE
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