linux-kernel - Re: [RFC 00/20] ns: Introduce Time Namespace

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Message-ID: <CAJwJo6bseG42YNqA0cxWpB0C252_CWER0gDrF0OUOm+=DJ7XdQ@mail.gmail.com>
Date:   Wed, 26 Sep 2018 18:59:49 +0100
From:   Dmitry Safonov <0x7f454c46@...il.com>
To:     "Eric W. Biederman" <ebiederm@...ssion.com>
Cc:     Andrey Vagin <avagin@...tuozzo.com>,
        Dmitry Safonov <dima@...sta.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Adrian Reber <adrian@...as.de>,
        Andy Lutomirski <luto@...nel.org>,
        Christian Brauner <christian.brauner@...ntu.com>,
        Cyrill Gorcunov <gorcunov@...nvz.org>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        Jeff Dike <jdike@...toit.com>, Oleg Nesterov <oleg@...hat.com>,
        Pavel Emelianov <xemul@...tuozzo.com>,
        Shuah Khan <shuah@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "containers@...ts.linux-foundation.org" 
        <containers@...ts.linux-foundation.org>,
        "criu@...nvz.org" <criu@...nvz.org>,
        "linux-api@...r.kernel.org" <linux-api@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        Alexey Dobriyan <adobriyan@...il.com>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>
Subject: Re: [RFC 00/20] ns: Introduce Time Namespace

2018-09-26 18:36 GMT+01:00 Eric W. Biederman <ebiederm@...ssion.com>:
> The advantage of timekeeping_update per time namespace is that it allows
> different lengths of seconds per time namespace.  Which allows testing
> ntp and the kernel in interesting ways while still having a working
> production configuration on the same system.

Just a quick note: the different length of second per namespace sounds
very interesting in my POV, I remember I've seen this article:
http://publish.illinois.edu/science-of-security-lablet/files/2014/05/DSSnet-A-Smart-Grid-Modeling-Platform-Combining-Electrical-Power-Distributtion-System-Simulation-and-Software-Defined-Networking-Emulation.pdf

And their realisation with a simulation of time going with different speed
per-pid  (with vdso disabled):
https://github.com/littlepretty/VirtualTimeKernel

Thanks,
             Dmitry