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From: Knut Omang <>
To: Luis Chamberlain <>,
	Brendan Higgins <>
Cc: Shuah Khan <>,,,
	Alan Maguire <>
Subject: Re: Plan for hybrid testing
Date: Mon, 14 Oct 2019 20:38:57 +0200	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On Mon, 2019-10-14 at 10:42 +0000, Luis Chamberlain wrote:
> On Fri, Sep 13, 2019 at 02:02:47PM -0700, Brendan Higgins wrote:
> > Hey Knut and Shuah,
> > 
> > Following up on our offline discussion on Wednesday night:
> > 
> > We decided that it would make sense for Knut to try to implement Hybrid
> > Testing (testing that crosses the kernel userspace boundary) that he
> > introduced here[1] on top of the existing KUnit infrastructure.
> > 
> > We discussed several possible things in the kernel that Knut could test
> > with the new Hybrid Testing feature as an initial example. Those were
> > (in reverse order of expected difficulty):
> > 
> > 1. RDS (Reliable Datagram Sockets) - We decided that, although this was
> >    one of the more complicated subsystems to work with, it was probably
> >    the best candidate for Knut to start with because it was in desperate
> >    need of better testing, much of the testing would require crossing
> >    the kernel userspace boundary to be effective, and Knut has access to
> >    RDS (since he works at Oracle).
> > 
> > 2. KMOD - Probably much simpler than RDS, and the maintainer, Luis
> >    Chamberlain (CC'ed) would like to see better testing here, but
> >    probably still not as good as RDS because it is in less dire need of
> >    testing, collaboration on this would be more difficult, and Luis is
> >    currently on an extended vacation. Luis and I had already been
> >    discussing testing KMOD here[2].
> I'm back!
> I'm also happy and thrilled to help review the infrastructure in great
> detail given I have lofty future objectives with testing in the kernel.
> Also, kmod is a bit more complex to test, if Knut wants a simpler *easy*
> target I think test_sysctl.c would be a good target. I think the goal
> there would be to add probes for a few of the sysctl callers, and then
> test them through userspace somehow, for instance?

That sounds like a good case for the hybrid tests.
The challenge in a kunit setting would be that it relies on a significant part of KTF
to work as we have used it so far:

- module support - Alan has been working on this 
- netlink approach from KTF (to allow user space execution of kernel 
  part of test, and gathering reporting in one place)
- probe infrastructure 

> The complexities with testing kmod is the threading aspect. So that is
> more of a challenge for a test infrastructure as a whole. However kmod
> also already has a pretty sound kthread solution which could be used
> as basis for any sound kernel multithread test solution.
> Curious, what was decided with the regards to the generic netlink approach?

I think in some way functionality similar to the netlink support is needed 
for the features in KTF that we discussed, so I get it is a "yes" to add 
support for it?


>   Luis

  reply	other threads:[~2019-10-14 18:41 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-13 21:02 Plan for hybrid testing Brendan Higgins
2019-09-16 16:20 ` shuah
2019-10-14 10:42 ` Luis Chamberlain
2019-10-14 18:38   ` Knut Omang [this message]
2019-10-14 19:01     ` shuah
2019-10-16 10:52       ` Knut Omang
2019-10-16 13:08         ` Luis Chamberlain
2019-10-17 17:46           ` Knut Omang
2019-10-17 19:11             ` shuah
2019-10-18  9:47             ` Luis Chamberlain
2019-10-18 18:35               ` Brendan Higgins
2019-10-18 19:22                 ` Luis Chamberlain
2019-10-18 19:58                   ` Brendan Higgins
2019-10-19 18:44                     ` Luis Chamberlain
2019-10-18 21:42           ` shuah

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