linux-kernel - Re: [RFC PATCH 00/11] mcount tracing utility

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Message-ID: <p73wsqqg4y1.fsf@bingen.suse.de>
Date:	Thu, 03 Jan 2008 19:05:42 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Christoph Hellwig <hch@...radead.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Gregory Haskins <ghaskins@...ell.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	"William L. Irwin" <sparclinux@...r.kernel.org>
Subject: Re: [RFC PATCH 00/11] mcount tracing utility

Steven Rostedt <rostedt@...dmis.org> writes:

> The following patch series brings to vanilla Linux a bit of the RT kernel
> trace facility. This incorporates the "-pg" profiling option of gcc
> that will call the "mcount" function for all functions called in
> the kernel.

My personal feeling regarding this code was that it would be much simpler/cleaner
to implement a driver for the "jump tracer"s implemented in various CPUs.
Basically the CPU will write all jumps into a buffer by itself. That
allows you to do many traces (although not latency traces) too.

-Andi
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