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 15:18:42 -0600
From:   Frank Rowand <frowand.list@...il.com>
To:     Brendan Higgins <brendanhiggins@...gle.com>, jdike@...toit.com,
        richard@....at, anton.ivanov@...bridgegreys.com, arnd@...db.de,
        keescook@...omium.org, skhan@...uxfoundation.org,
        alan.maguire@...cle.com, yzaikin@...gle.com, davidgow@...gle.com,
        akpm@...ux-foundation.org, rppt@...ux.ibm.com
Cc:     gregkh@...uxfoundation.org, sboyd@...nel.org, logang@...tatee.com,
        mcgrof@...nel.org, knut.omang@...cle.com,
        linux-um@...ts.infradead.org, linux-arch@...r.kernel.org,
        linux-kselftest@...r.kernel.org, kunit-dev@...glegroups.com,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org
Subject: Re: [PATCH v2 0/7] kunit: create a centralized executor to dispatch
 all KUnit tests

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 .... ?

> 
> ## 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.

-Frank

> was a concern during the initial KUnit patchset review (this has not
> been a problem in practice, but resolving with certainty is nevertheless
> desirable).
> 
> Other use cases for this exist, but the above features should provide an
> idea of the value that this could provide.
> 
> Alan Maguire (1):
>   kunit: test: create a single centralized executor for all tests
> 
> Brendan Higgins (5):
>   vmlinux.lds.h: add linker section for KUnit test suites
>   arch: um: add linker section for KUnit test suites
>   init: main: add KUnit to kernel init
>   kunit: test: add test plan to KUnit TAP format
>   Documentation: Add kunit_shutdown to kernel-parameters.txt
> 
> David Gow (1):
>   kunit: Add 'kunit_shutdown' option
> 
>  .../admin-guide/kernel-parameters.txt         |  7 ++
>  arch/um/include/asm/common.lds.S              |  4 +
>  include/asm-generic/vmlinux.lds.h             |  8 ++
>  include/kunit/test.h                          | 82 ++++++++++++-------
>  init/main.c                                   |  4 +
>  lib/kunit/Makefile                            |  3 +-
>  lib/kunit/executor.c                          | 71 ++++++++++++++++
>  lib/kunit/test.c                              | 11 ---
>  tools/testing/kunit/kunit_kernel.py           |  2 +-
>  tools/testing/kunit/kunit_parser.py           | 76 ++++++++++++++---
>  .../test_is_test_passed-all_passed.log        |  1 +
>  .../test_data/test_is_test_passed-crash.log   |  1 +
>  .../test_data/test_is_test_passed-failure.log |  1 +
>  13 files changed, 217 insertions(+), 54 deletions(-)
>  create mode 100644 lib/kunit/executor.c
>