Linux-kselftest Archive on lore.kernel.org
 help / color / Atom feed
From: Knut Omang <knut.omang@oracle.com>
To: Brendan Higgins <brendanhiggins@google.com>
Cc: linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-doc@vger.kernel.org, linux-kbuild@vger.kernel.org,
	Shuah Khan <shuah@kernel.org>, Jonathan Corbet <corbet@lwn.net>,
	Masahiro Yamada <yamada.masahiro@socionext.com>,
	Michal Marek <michal.lkml@markovi.net>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Shreyans Devendra Doshi <0xinfosect0r@gmail.com>,
	Alan Maguire <alan.maguire@oracle.com>,
	Kevin Hilman <khilman@baylibre.com>,
	Hidenori Yamaji <hidenori.yamaji@sony.com>,
	Frank Rowand <frowand.list@gmail.com>,
	Timothy Bird <Tim.Bird@sony.com>,
	Luis Chamberlain <mcgrof@kernel.org>,
	"Theodore Ts'o" <tytso@mit.edu>, Daniel Vetter <daniel@ffwll.ch>,
	Stephen Boyd <sboyd@kernel.org>
Subject: Re: [RFC 03/19] ktf: Introduce a generic netlink protocol for test result communication
Date: Tue, 10 Sep 2019 08:30:25 +0200
Message-ID: <644ff48481f3dd7295798dcef88b4abcc8695260.camel@oracle.com> (raw)
In-Reply-To: <20190909012837.GA33048@google.com>

On Sun, 2019-09-08 at 18:28 -0700, Brendan Higgins wrote:
> On Tue, Aug 13, 2019 at 08:09:18AM +0200, Knut Omang wrote:
> > The generic netlink protocol used to communicate between
> > kernel and user space about tests and test results, as well as some
> > means for configuring tests within the kernel.
> > 
> > Unlike other kernel side test code in the kernel, ktf does not print
> > anything from inside the kernel (except for optional debugging
> > features to help "internal" debugging of ktf or ktf tests).
> > Instead all test results are communicated back to the user space
> > frontend, which decides how to do the reporting.
> 
> So why netlink? Why not just a file interface?

Netlink allows more flexibility in that it is bidirectional and asynchronous.
User space may query the kernel for available tests and then decide which tests
to invoke. User land test frameworks like Googletest allows use of wildcards and
exceptions to select particular tests to run. This is in my opinion very
important functionality as we want the tests to be valuable as developer tools,
not just to check the code as part of a later QA cycle. 
Being able to run a single test or a small subset of the tests is very useful.

Wrt test reporting, the kernel side just dispatches off messages about test
results as they are gathered. Compare this to the complexities, side effects and
limitations of printk.

Besides, for hybrid tests, bidirectional communication allows a test to contain
a mix (or a function) of results gathered in the kernel and in user space.

We also use it for network tests, where user space needs to tell the kernel 
what peer(s) to communicate with, and for certain minimal configuration, such as
which device instance to use for device testing. Test nodes may vary in what
they offer of hardware. Although we'd like to minimize the need for
configuration, as results should be easily reproducable, sometimes there is no
good way around.

Thanks,
Knut

> [...]
> 
> Cheers


  reply index

Thread overview: 44+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-13  6:09 [RFC 00/19] Integration of Kernel Test Framework (KTF) into the kernel tree Knut Omang
2019-08-13  6:09 ` [RFC 01/19] kbuild: Fixes to rules for host-cshlib and host-cxxshlib Knut Omang
2019-08-13 14:01   ` Masahiro Yamada
2019-08-13 16:19     ` Knut Omang
2019-08-14  2:02       ` Masahiro Yamada
2019-08-14  5:50         ` Knut Omang
2019-08-14  5:52         ` Knut Omang
2019-08-14 12:52           ` Knut Omang
2019-08-21  1:47             ` Masahiro Yamada
2019-08-21  4:03               ` Knut Omang
2019-08-13  6:09 ` [RFC 02/19] ktf: Introduce the main part of the kernel side of ktf Knut Omang
2019-09-09  1:23   ` Brendan Higgins
2019-09-10  6:15     ` Knut Omang
2019-08-13  6:09 ` [RFC 03/19] ktf: Introduce a generic netlink protocol for test result communication Knut Omang
2019-09-09  1:28   ` Brendan Higgins
2019-09-10  6:30     ` Knut Omang [this message]
2019-08-13  6:09 ` [RFC 04/19] ktf: An implementation of a generic associative array container Knut Omang
2019-08-13  6:09 ` [RFC 05/19] ktf: Implementation of ktf support for overriding function entry and return Knut Omang
2019-08-13  6:09 ` [RFC 06/19] ktf: A simple debugfs interface to test results Knut Omang
2019-08-13  8:21   ` Greg Kroah-Hartman
2019-08-14 17:17     ` Knut Omang
2019-08-15  8:49       ` Greg Kroah-Hartman
2019-08-15 10:35         ` Knut Omang
2019-08-15 10:52           ` Greg Kroah-Hartman
2019-08-13  6:09 ` [RFC 07/19] ktf: Simple coverage support Knut Omang
2019-08-13  6:09 ` [RFC 08/19] ktf: Configurable context support for network info setup Knut Omang
2019-08-13  6:09 ` [RFC 09/19] ktf: resolve: A helper utility to aid in exposing private kernel symbols to KTF tests Knut Omang
2019-08-13  6:09 ` [RFC 10/19] ktf: Add documentation for Kernel Test Framework (KTF) Knut Omang
2019-08-13  6:09 ` [RFC 11/19] ktf: Add a small test suite with a few tests to test KTF itself Knut Omang
2019-08-13  6:09 ` [RFC 12/19] ktf: Main part of user land library for executing tests Knut Omang
2019-08-13  6:09 ` [RFC 13/19] ktf: Integration logic for running ktf tests from googletest Knut Omang
2019-08-13  6:09 ` [RFC 14/19] ktf: Internal debugging facilities Knut Omang
2019-08-13  6:09 ` [RFC 15/19] ktf: Some simple examples Knut Omang
2019-08-13  6:09 ` [RFC 16/19] ktf: Some user applications to run tests Knut Omang
2019-08-13  6:09 ` [RFC 17/19] ktf: Toplevel ktf Makefile/makefile includes and scripts to run from kselftest Knut Omang
2019-08-13  6:09 ` [RFC 18/19] kselftests: Enable building ktf Knut Omang
2019-08-13  6:09 ` [RFC 19/19] Documentation/dev-tools: Add index entry for KTF documentation Knut Omang
2019-08-13  8:10 ` [RFC 00/19] Integration of Kernel Test Framework (KTF) into the kernel tree Brendan Higgins
2019-08-13  8:17 ` Brendan Higgins
2019-08-13 11:29   ` Knut Omang
2019-08-13 17:50     ` Brendan Higgins
2019-08-13  8:23 ` Greg Kroah-Hartman
2019-08-13  9:51   ` Knut Omang
2019-08-13 17:02     ` Brendan Higgins

Reply instructions:

You may reply publically to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=644ff48481f3dd7295798dcef88b4abcc8695260.camel@oracle.com \
    --to=knut.omang@oracle.com \
    --cc=0xinfosect0r@gmail.com \
    --cc=Tim.Bird@sony.com \
    --cc=alan.maguire@oracle.com \
    --cc=brendanhiggins@google.com \
    --cc=corbet@lwn.net \
    --cc=daniel@ffwll.ch \
    --cc=frowand.list@gmail.com \
    --cc=gregkh@linuxfoundation.org \
    --cc=hidenori.yamaji@sony.com \
    --cc=khilman@baylibre.com \
    --cc=linux-doc@vger.kernel.org \
    --cc=linux-kbuild@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-kselftest@vger.kernel.org \
    --cc=mcgrof@kernel.org \
    --cc=michal.lkml@markovi.net \
    --cc=sboyd@kernel.org \
    --cc=shuah@kernel.org \
    --cc=tytso@mit.edu \
    --cc=yamada.masahiro@socionext.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux-kselftest Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-kselftest/0 linux-kselftest/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-kselftest linux-kselftest/ https://lore.kernel.org/linux-kselftest \
		linux-kselftest@vger.kernel.org
	public-inbox-index linux-kselftest

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-kselftest


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git