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? 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? Luis
