linux-kernel - Re: [PATCH 0/11] LTTng-core (basic tracing infrastructure) 0.5.108

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Message-ID: <y0m3basg2ig.fsf@ton.toronto.redhat.com>
Date:	15 Sep 2006 18:59:19 -0400
From:	fche@...hat.com (Frank Ch. Eigler)
To:	Ingo Molnar <mingo@...e.hu>
Cc:	"Jose R. Santos" <jrs@...ibm.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Roman Zippel <zippel@...ux-m68k.org>,
	Andrew Morton <akpm@...l.org>, tglx@...utronix.de,
	karim@...rsys.com, Paul Mundt <lethal@...ux-sh.org>,
	Jes Sorensen <jes@....com>, linux-kernel@...r.kernel.org,
	Christoph Hellwig <hch@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Tom Zanussi <zanussi@...ibm.com>, ltt-dev@...fik.org,
	Michel Dagenais <michel.dagenais@...ymtl.ca>
Subject: Re: [PATCH 0/11] LTTng-core (basic tracing infrastructure) 0.5.108

Ingo Molnar <mingo@...e.hu> writes:

> [...]  NOTE: i still accept the temporary (or non-temporary)
> introduction of static markers, to help dynamic tracing. But my
> expectation is that these markers will be less intrusive than static
> tracepoints, and a lot more flexible.

It seems like an agreement on this is coming together.  You and Karim
may be in violent agreement, even if others haven't quite come around:

Let us design a static marker mechanism that can be coupled at run
time either to a dynamic system such as systemtap, or by a specialized
tracing system such as lttnng (!).  Then "markers" === "static
instrumentation", for purposes of the kernel developer.  If the
markers are lightweight enough, then a distribution kernel can afford
keeping them compiled in.

- FChE
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