linux-kernel - Re: systemtap & backward compatibility, was Re: [RFC] systemtap: begin the process of using proper kernel APIs

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Date:	Wed, 23 Jul 2008 13:34:38 -0400
From:	"Frank Ch. Eigler" <fche@...hat.com>
To:	Adrian Bunk <bunk@...nel.org>
Cc:	Arjan van de Ven <arjan@...radead.org>,
	Rik van Riel <riel@...hat.com>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	systemtap@...rceware.org
Subject: Re: systemtap & backward compatibility, was Re: [RFC] systemtap: begin the process of using proper kernel APIs

Hi -

On Wed, Jul 23, 2008 at 07:54:05PM +0300, Adrian Bunk wrote:
> On Wed, Jul 23, 2008 at 12:41:37PM -0400, Frank Ch. Eigler wrote:
> >...
> > In the interim (before we come up with a way of moving more
> > kernel-coupled systemtap code into kernel.org/git), would y'all
> > consider an arrangement?  Those of you who care about systemtap, and
> > are intending to make an incompatible kernel/module interface change,
> > please run the systemtap testsuite before & after.  [...]

> The number of incompatible kernel/module interface changes per
> kernel is most likely some medium three digit number.  What you have
> in mind is therefore not really feasible.

Do you think so, even if the historical pattern continues that only a
small fraction of those changes actually impact systemtap?


> But we have several levels of kernels that incorporate future stuff,
> from -rc over -next to -mm, and you could implement automated runs
> of the systemtap testsuite against the latest ones.

We do some of that already and should do more.


- FChE
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