linux-kernel - Re: Test harness in the kernel for new syscalls? [Was: Trace code and documentation (updated)]

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Date:	Thu, 20 Sep 2007 21:50:42 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	Christoph Hellwig <hch@...radead.org>,
	David Wilder <dwilder@...ibm.com>,
	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: Test harness in the kernel for new syscalls? [Was: Trace code
 and documentation (updated)]

On Wed, 19 Sep 2007 20:01:15 +0200 Sam Ravnborg wrote:

> On Wed, Sep 19, 2007 at 06:51:09PM +0100, Christoph Hellwig wrote:
> > On Wed, Sep 19, 2007 at 07:48:45PM +0200, Sam Ravnborg wrote:
> > > > Well, this is kernel code - so util-linux is not the solution here
> > > > obviously :)

so kernel sample code goes in the new samples/ directory,
and userspace sample code gets pushed to util-linux ?

> > > Can you sketch what you have in mind.
> > > We right now have said we wnated to:
> > > 1) include a framework for executing simple new-syscall-test-stubs
> > > 2) have a nice place for kernel example code
> > > 
> > > I could come up with something but I expect you already have something
> > > in your mind where to put stuff.
> > > If I have a rough idea I can start looking into the kbuild bits of it.
> > > Not that I will have it ready within the next two weeks but nice buffer
> > > when I anyway drop sleeping..
> > 
> > I think for samples we just want a samples/ toplevel directory with
> > normal Kbuild and Kconfig files.  Not any different from drivers or
> > filesystems, just a new hiearchary.
> 
> OK - anyone can do this. So I will not worry.
> 
> 
> > tests stuff was rather disliked by Linus, so I wonder wether we should
> > go ahead with it.
> I heard it like "Ok for new syscalls".
> 
> And it is resonable for new syscalls because:
>   o Make the test of the syscall public
>   o Is a nice example of the usage of the syscalls (both good and bad cases)
>   o Is availbale for other platforms that plan to implement the same syscall
>   o We (at least a few sufficiently skilled ones) will then review not only
>     the syscall but also the use of the syscall

That's a good idea/plan.

> >  We'd need a test driver like expect to driver the
> > testcases.
> OK - may give it a spin one day.
> But I hope someone that have done similar stuff can come
> with some example code we can adapt to the kernel.


---
~Randy
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