linux-kernel - Re: [Y2038][time namespaces] Question regarding CLOCK_REALTIME support plans in Linux time namespaces

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Message-ID: <20201103124323.GA8061@yuki.lan>
Date:   Tue, 3 Nov 2020 13:43:23 +0100
From:   Cyril Hrubis <chrubis@...e.cz>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Carlos O'Donell <carlos@...hat.com>,
        Zack Weinberg <zackw@...ix.com>,
        Dmitry Safonov <dima@...sta.com>,
        Andrei Vagin <avagin@...il.com>,
        GNU C Library <libc-alpha@...rceware.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [Y2038][time namespaces] Question regarding CLOCK_REALTIME
 support plans in Linux time namespaces

Hi!
> Virtualization is the right answer to the testing problem and if people
> really insist on running their broken legacy apps past 2038, then stick
> them into a VM and charge boatloads of money for that service.

Let me just emphasise this with a short story. Before I release LTP I do
a lot of pre-release testruns to make sure that all tests works well on
a different distributions and kernel versions.

Before I wrote a script that automated this[1] i.e. runs all the tests in
qemu and filters out the interesting results it took me a few days of
manual labor to finish the task. Now I just schedulle the jobs and after
a day or two I get the results. Even if the tested kernel crashes, which
happens a lot, the machine is just restarted automatically and the
testrun carries on with a next test. All in all the work that has been
put into the solution wasn't that big to begin with it took me a week to
write a first prototype from a scratch.

[1] https://github.com/metan-ucw/runltp-ng

-- 
Cyril Hrubis
chrubis@...e.cz