From: Cyril Hrubis <chrubis@suse.cz>
To: Lukasz Majewski <lukma@denx.de>
Cc: Andrei Vagin <avagin@gmail.com>, Dmitry Safonov <dima@arista.com>,
Thomas Gleixner <tglx@linutronix.de>,
GNU C Library <libc-alpha@sourceware.org>,
linux-kernel@vger.kernel.org
Subject: Re: [Y2038][time namespaces] Question regarding CLOCK_REALTIME support plans in Linux time namespaces
Date: Fri, 30 Oct 2020 14:58:16 +0100 [thread overview]
Message-ID: <20201030135816.GA1790@yuki.lan> (raw)
In-Reply-To: <20201030110229.43f0773b@jawa>
Hi!
> I do have a question regarding the Linux time namespaces in respect of
> adding support for virtualizing the CLOCK_REALTIME.
>
> According to patch description [1] and time_namespaces documentation
> [2] the CLOCK_REALTIME is not supported (for now?) to avoid complexity
> and overhead in the kernel.
>
> Is there any plan to add support for it in a near future?
>
> Why I'm asking?
>
> It looks like this kernel feature (with CLOCK_REALTIME support
> available) would be very helpful for testing Y2038 compliance for e.g.
> glibc 32 bit ports.
>
> To be more specific - it would be possible to modify time after time_t
> 32 bit overflow (i.e. Y2038 bug) on the process running Y2038
> regression tests on the host system (64 bit one). By using Linux time
> namespaces the system time will not be affected in any way.
And what's exactly wrong with moving the system time forward for a
duration of the test?
--
Cyril Hrubis
chrubis@suse.cz
next prev parent reply other threads:[~2020-10-30 13:57 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-30 10:02 [Y2038][time namespaces] Question regarding CLOCK_REALTIME support plans in Linux time namespaces Lukasz Majewski
2020-10-30 13:08 ` Thomas Gleixner
2020-10-30 15:43 ` Lukasz Majewski
2020-10-30 13:58 ` Cyril Hrubis [this message]
2020-10-30 14:02 ` Zack Weinberg
2020-10-30 15:10 ` Thomas Gleixner
2020-10-30 16:58 ` Carlos O'Donell
2020-10-30 20:06 ` Thomas Gleixner
2020-10-30 22:19 ` Carlos O'Donell
2020-10-31 1:38 ` Thomas Gleixner
2020-11-03 12:43 ` Cyril Hrubis
2020-11-05 17:25 ` Carlos O'Donell
2020-11-07 0:47 ` Thomas Gleixner
2020-11-19 18:37 ` Carlos O'Donell
2020-11-20 0:14 ` Thomas Gleixner
2020-11-25 17:06 ` Petr Špaček
2020-11-25 20:37 ` Carlos O'Donell
2020-11-26 0:17 ` Thomas Gleixner
2020-11-26 3:05 ` Carlos O'Donell
2020-11-26 8:21 ` Andreas Schwab
2020-11-14 10:25 ` Pavel Machek
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