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

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Message-ID: <20070921133006.GF8964@redhat.com>
Date:	Fri, 21 Sep 2007 09:30:07 -0400
From:	"Frank Ch. Eigler" <fche@...hat.com>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	Denys Vlasenko <vda.linux@...glemail.com>, dsmith@...hat.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 Fri, Sep 21, 2007 at 08:58:19AM -0400, Mathieu Desnoyers wrote:
> [...]
> > > Current systemtap marker support code relies on the __markers_strings
> > > section.
> > Let users know that in comment above section definition in ld script.
> [...]
>         /* Markers: strings (used by SystemTAP) */                      \
> [...]

I did not mean to imply that this was a necessary state of affairs.

The marker metadata must be stored in at least one place in the kernel
image - this just happens to be a convenient one that David Smith's
recent systemtap code used.  Without it, we'd probably have to do a
more complicated search, following the pointers within the __markers
structs.  That could work, but it hasn't been built/tested.

So, this proposed change (removal of this section) would break
systemtap, and we have to jump through more hoops to make it work
again.  Is the change worth it?

- FChE
-
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