Re: [LSF/MM TOPIC] FS, MM, and stable trees

[Amir Goldstein <amir73il@gmail.com>]

On Sat, Mar 12, 2022 at 12:04 AM Theodore Ts'o <tytso@mit.edu> wrote:
>
> On Fri, Mar 11, 2022 at 12:52:41PM -0800, Luis Chamberlain wrote:
> >
> > The only way to move forward with enabling more automation for kernel
> > code integration is through better and improved kernel test automation.
> > And it is *exactly* why I've been working so hard on that problem.
>
> I think we're on the same page here.
>
> > Also let's recall that just because you have your own test framework
> > it does not mean we could not benefit from others testing our
> > filesystems on their own silly hardware at home as well. Yes tons
> > of projects can be used which wrap fstests...
>
> No argument from me!  I'm strongly in favor of diversity in test
> framework automation as well as test environments.
>
> In particular, I think there are some valuable things we can learn
> from each other, in terms of cross polination in terms of features and
> as well as feedback about how easy it is to use a particular test
> framework.
>
> For example: README.md doesn't say anything about running make as root
> when running "make" as kdevops.  At least, I *think* this is why
> running make as kdevops failed:
>
> fatal: [localhost]: FAILED! => {"changed": true, "cmd": ["/usr/sbin/apparmor_status", "--enabled"], "delta": "0:00:00.001426", "end": "2022-03-11 16:23:11.769658", "failed_when_result": true, "rc": 0, "start": "2022-03-11 16:23:11.768232", "stderr": "", "stderr_lines": [], "stdout": "", "stdout_lines": []}
>
> (I do have apparmor installed, but it's currently not enabled.  I
> haven't done more experimentation since I'm a bit scared of running
> "make XXX" as root for any package I randomly download from the net,
> so I haven't explored trying to use kdevops, at least not until I set
> up a sandboxed VM.  :-)
>
> Including the Debian package names that should be installed would also
> be helpful in kdevops/doc/requirements.md.  That's not a problem for
> the experienced Debian developer, but one of my personal goals for
> kvm-xfstests and gce-xfstests is to allow a random graduate student
> who has presented some research file system like Betrfs at the Usenix
> FAST conference to be able to easily run fstests.  And it sounds like
> you have similar goals of "enabling the average user to also easily
> run tests".
>
>
> > but I never found one
> > as easy to use as compiling the kernel and running a few make commands.
>
> I've actually done a lot of work to optimize developer velocity using
> my test framework.  So for example:
>
> kvm-xfstests install-kconfig    # set up a kernel Kconfig suitable for kvm-xfstests and gce-xfstests
> make
> kvm-xfstests smoke     # boot the test appliance VM, using the kernel that was just built
>
> And a user can test a particular stable kernel using a single command
> line (this will checkout a particular kernel, and build it on a build
> VM, and then launch tests in parallel on a dozen or so VM's):
>
> gce-xfstests ltm -c ext4/all -g auto --repo stable.git --commit v5.15.28
>
> ... or if we want to bisect a particular test failure, we might do
> something like this:
>
> gce-xfstests ltm -c ext4 generic/361 --bisect-good v5.15 --bisect-bad v5.16
>
> ... or I can establish a watcher that will automatically build a git
> tree when a branch on a git tree changes:
>
> gce-xfstests ltm -c ext4/4k -g auto --repo next.git --watch master
>
> Granted, this only works on GCE --- but feel free to take these ideas
> and integrate them into kdevops if you feel inspired to do so.  :-)
>
> > There is the concept of results too and a possible way to share things..
> > but this is getting a bit off topic and I don't want to bore people more.
>
> This would be worth chatting about, perhaps at LSF/MM.  xfstests
> already supports junit results files; we could convert it to TAP
> format, but junit has more functionality, so perhaps the right
> approach is to have tools that can support both TAP and junit?  What
> about some way to establish interchange of test artifacts?  i.e.,
> saving the kernel logs, and the generic/NNN.full and
> generic/NNN.out.bad files?
>
> I have a large library of these test results and test artifacts, and
> perhaps others would find it useful if we had a way sharing test
> results between developers, especially we have multiple test
> infrastructures that might be running ext4, f2fs, and xfs tests?
>

Hi Ted,

I penciled a session on "Challenges with running fstests" in the
agenda.

I was hoping that you and Luis could co-lead this session and
present the progress both of you made with your test frameworks.

Thanks,
Amir.