linux-kernel - Re: Ftrace and Systemtap

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Message-ID: <4BB3A1F5.1050902@am.sony.com>
Date:	Wed, 31 Mar 2010 12:26:45 -0700
From:	Tim Bird <tim.bird@...sony.com>
To:	"swb6@...r.ac.uk" <swb6@...r.ac.uk>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Ftrace and Systemtap

On 03/31/2010 10:36 AM, swb6@...r.ac.uk wrote:
> Hi,
> I am currently writing up my
> dissertation based on dynamic tracing and reducing the learning curve to
> understanding the UNIX kernel. I used two dynamic tracing technologies
> (Systemtap and Dtrace) to monitor some virtual machines on a network.
> Whilst going over my initial review of technologies in the area of dynamic
> tracing I realised I had underestimated ftrace, and even dismissed it as
> not being dynamic. However I read hear (http://lwn.net/Articles/343766/)
> that you were as of July last year trying to introduce a patch that would
> allow ftrace the ability to dynamically trace. Also it would be completely
> instrumented from the command line without the need to compile a kernel
> module al la Systemtap.
> 
> My question is do you think Systemtap will be replaced by ftrace in the
> future if so I feel I may need to include this fact in my updated
> technology review.

Systemtap addresses a different set of needs than ftrace.
Ftrace has been dynamic for some time, but in a different way
than Systemtap.

I don't see either system going away soon.

=============================
Tim Bird
Architecture Group Chair, CE Linux Forum
Senior Staff Engineer, Sony Corporation of America
=============================

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