linux-kernel - Re: [patch 1/4] Linux Kernel Markers

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Date:	Fri, 26 Oct 2007 10:28:10 -0400
From:	"Frank Ch. Eigler" <fche@...hat.com>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	Roland McGrath <roland@...hat.com>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Denys Vlasenko <vda.linux@...glemail.com>,
	systemtap@...rces.redhat.com,
	Christoph Hellwig <hch@...radead.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [patch 1/4] Linux Kernel Markers - Architecture Independent Code

Hi -

On Thu, Oct 25, 2007 at 03:17:22PM -0400, Mathieu Desnoyers wrote:
> [...]
> Since gcc is required to build the systemtap probes on the development
> marchine, I don't see why it would be much harder to also require prople
> to install drawf ? Or maybe the "crash" tool ?

The crash tool requires the dwarf data to work.  The dwarf data for an
entire kernel (including all the modules) is on the order of hundreds
of megabytes.  The symbol & marker list would be one thousandth the
size.  You can see the deployment attractiveness of the latter.

> I guess you must already need to extract the symbols for your kprobes.
> Do you use kallsyms for this? 

Nope.  /proc/kallsyms is a another run-time-only source of data, and
so is not applicable for off-line (ahead-of-time) mapping.

> I would rather prefer not to implement superfluous built-time data
> extraction in the kernel build system just to make userspace
> simpler. [...]

It is not superfluous, as it would solve a real distribution problem.


- FChE
-
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