linux-kernel - Re: Performance analysis of Linux Kernel Markers 0.20 for 2.6.17

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Message-Id: <1159642933.2355.1.camel@entropy>
Date:	Sat, 30 Sep 2006 12:02:13 -0700
From:	Nicholas Miell <nmiell@...cast.net>
To:	Mathieu Desnoyers <compudj@...stal.dyndns.org>
Cc:	Martin Bligh <mbligh@...gle.com>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	prasanna@...ibm.com, Andrew Morton <akpm@...l.org>,
	Ingo Molnar <mingo@...e.hu>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Paul Mundt <lethal@...ux-sh.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Jes Sorensen <jes@....com>, Tom Zanussi <zanussi@...ibm.com>,
	Richard J Moore <richardj_moore@...ibm.com>,
	Michel Dagenais <michel.dagenais@...ymtl.ca>,
	Christoph Hellwig <hch@...radead.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	William Cohen <wcohen@...hat.com>, ltt-dev@...fik.org,
	systemtap@...rces.redhat.com, Alan Cox <alan@...rguk.ukuu.org.uk>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Karim Yaghmour <karim@...rsys.com>,
	Pavel Machek <pavel@...e.cz>, Joe Perches <joe@...ches.com>,
	"Randy.Dunlap" <rdunlap@...otime.net>,
	"Jose R. Santos" <jrs@...ibm.com>
Subject: Re: Performance analysis of Linux Kernel Markers 0.20 for 2.6.17

On Sat, 2006-09-30 at 14:01 -0400, Mathieu Desnoyers wrote:
> Hi,
> 
> Following the huge discussion thread about tracing/static vs dynamic
> instrumentation/markers, a consensus seems to emerge about the need for a
> marker system in the Linux kernel. The main issues this mechanism addresses are:
> 
> - Identify code important to runtime data collection/analysis tools in tree so
>   that it follows the code changes naturally.
> - Be visually appealing to kernel developers.
> - Have a very low impact on the system performance.
> - Integrate in the standard kernel infrastructure : use C and loadable modules.
> 
> The time has come for some performance measurements of the Linux Kernel Markers,
> which follows. I attach a PDF with tables and charts which condense these
> results.

Has anyone done any performance measurements with the "regular function
call replaced by a NOP" type of marker?

-- 
Nicholas Miell <nmiell@...cast.net>

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