linux-kernel - Re: [PATCH] Linux Kernel Markers

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Message-ID: <20060919174357.GB26339@Krystal>
Date:	Tue, 19 Sep 2006 13:43:57 -0400
From:	Mathieu Desnoyers <compudj@...stal.dyndns.org>
To:	Vara Prasad <prasadav@...ibm.com>
Cc:	"Martin J. Bligh" <mbligh@...gle.com>, Ingo Molnar <mingo@...e.hu>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Paul Mundt <lethal@...ux-sh.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Jes Sorensen <jes@....com>, Andrew Morton <akpm@...l.org>,
	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>
Subject: Re: [PATCH] Linux Kernel Markers

* Vara Prasad (prasadav@...ibm.com) wrote:
> It is an interesting idea but there appears to be following hard issues 
> (some of which you have already listed) i am not able to see how we can 
> overcome them
> 
> 1) We are going to have a duplicate of the whole function which means 
> any significant changes in the original function needs to be done on the 
> copy as well, you think maintainers would like this double work idea.
> 
Not with my marker proposal. There is only need to compile it with different
flags.

> 2) Inline functions is often the place where we need a fast path to 
> overcome the current kprobes overhead.
> 
> 3) As you said it is not trivial across all the platforms to do a switch 
> to the instrumented function from the original during the execution.  
> This problem is similar to the issue we are dealing with djprobes.
> 

I would really like to know how good djprobes is at instrumenting the
prologue of a function.

Mathieu

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