linux-kernel - Re: [PATCH v2 0/7] kunit: create a centralized executor to dispatch all KUnit tests

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Date:   Tue, 4 Feb 2020 14:01:33 -0800
From:   Brendan Higgins <brendanhiggins@...gle.com>
To:     Frank Rowand <frowand.list@...il.com>
Cc:     Jeff Dike <jdike@...toit.com>, Richard Weinberger <richard@....at>,
        Anton Ivanov <anton.ivanov@...bridgegreys.com>,
        Arnd Bergmann <arnd@...db.de>,
        Kees Cook <keescook@...omium.org>,
        Shuah Khan <skhan@...uxfoundation.org>,
        Alan Maguire <alan.maguire@...cle.com>,
        Iurii Zaikin <yzaikin@...gle.com>,
        David Gow <davidgow@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>, rppt@...ux.ibm.com,
        Greg KH <gregkh@...uxfoundation.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Logan Gunthorpe <logang@...tatee.com>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Knut Omang <knut.omang@...cle.com>,
        linux-um <linux-um@...ts.infradead.org>,
        linux-arch@...r.kernel.org,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        KUnit Development <kunit-dev@...glegroups.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>
Subject: Re: [PATCH v2 0/7] kunit: create a centralized executor to dispatch
 all KUnit tests

On Tue, Feb 4, 2020 at 1:18 PM Frank Rowand <frowand.list@...il.com> wrote:
>
> On 1/30/20 5:08 PM, Brendan Higgins wrote:
> > ## TL;DR
> >
> > This patchset adds a centralized executor to dispatch tests rather than
> > relying on late_initcall to schedule each test suite separately along
> > with a couple of new features that depend on it.
>
> And the "couple of new features" are .... ?

Sorry, I thought I addressed that in the next section, specifically by
calling out: printing the test plan, and adding the new kernel command
line option. I will call these out here in any future cover letters.

> > ## What am I trying to do?
> >
> > Conceptually, I am trying to provide a mechanism by which test suites
> > can be grouped together so that they can be reasoned about collectively.
> > The last two of three patches in this series add features which depend
> > on this:
> >
> > PATCH 5/7 Prints out a test plan right before KUnit tests are run[1];
> >           this is valuable because it makes it possible for a test
> >           harness to detect whether the number of tests run matches the
> >           number of tests expected to be run, ensuring that no tests
> >           silently failed.
> >
> > PATCH 6/7 Add a new kernel command-line option which allows the user to
> >           specify that the kernel poweroff, halt, or reboot after
> >           completing all KUnit tests; this is very handy for running
> >           KUnit tests on UML or a VM so that the UML/VM process exits
> >           cleanly immediately after running all tests without needing a
> >           special initramfs.
> >
>
> > In addition, by dispatching tests from a single location, we can
> > guarantee that all KUnit tests run after late_init is complete, which
>
> That the tests will run after late init (and are guaranteed to do such)
> needs to be added to the documentation.

Yeah, that's reasonable. I am not sure where I should put this in the
documentation, however. This seems kind of a technical detail, and all
the pages I have now are more of how-tos, I think.

Maybe I should send a patch which adds a page detailing how KUnit works?

I would like to get some other people's thoughts on this. Such a
technical guide wouldn't provide me a lot of value, at least not now,
so I want to make sure that something like that would be valuable to
others.