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From: 0x7f454c46 at gmail.com (Dmitry Safonov)
Subject: [RFC 00/20] ns: Introduce Time Namespace
Date: Wed, 26 Sep 2018 18:59:49 +0100	[thread overview]
Message-ID: <CAJwJo6bseG42YNqA0cxWpB0C252_CWER0gDrF0OUOm+=DJ7XdQ@mail.gmail.com> (raw)
In-Reply-To: <87zhw4rwiq.fsf@xmission.com>

2018-09-26 18:36 GMT+01:00 Eric W. Biederman <ebiederm at xmission.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

WARNING: multiple messages have this Message-ID (diff)
From: 0x7f454c46@gmail.com (Dmitry Safonov)
Subject: [RFC 00/20] ns: Introduce Time Namespace
Date: Wed, 26 Sep 2018 18:59:49 +0100	[thread overview]
Message-ID: <CAJwJo6bseG42YNqA0cxWpB0C252_CWER0gDrF0OUOm+=DJ7XdQ@mail.gmail.com> (raw)
Message-ID: <20180926175949.JvM_3dFgRHJpO4PT_G605bce1gQz8us_vatkpRAKFR0@z> (raw)
In-Reply-To: <87zhw4rwiq.fsf@xmission.com>

2018-09-26 18:36 GMT+01:00 Eric W. Biederman <ebiederm at xmission.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

  parent reply	other threads:[~2018-09-26 17:59 UTC|newest]

Thread overview: 78+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-09-19 20:50 [RFC 00/20] ns: Introduce Time Namespace dima
2018-09-19 20:50 ` Dmitry Safonov
2018-09-19 20:50 ` [RFC 16/20] selftest: Add Time Namespace test for supported clocks dima
2018-09-19 20:50   ` Dmitry Safonov
2018-09-24 21:36   ` shuah
2018-09-24 21:36     ` Shuah Khan
2018-09-19 20:50 ` [RFC 17/20] selftest/timens: Add test for timerfd dima
2018-09-19 20:50   ` Dmitry Safonov
2018-09-19 20:50 ` [RFC 18/20] selftest/timens: Add test for clock_nanosleep dima
2018-09-19 20:50   ` Dmitry Safonov
2018-09-19 20:50 ` [RFC 19/20] timens/selftest: Add procfs selftest dima
2018-09-19 20:50   ` Dmitry Safonov
2018-09-19 20:50 ` [RFC 20/20] timens/selftest: Add timer offsets test dima
2018-09-19 20:50   ` Dmitry Safonov
2018-09-21 12:27 ` [RFC 00/20] ns: Introduce Time Namespace ebiederm
2018-09-21 12:27   ` Eric W. Biederman
2018-09-24 20:51   ` avagin
2018-09-24 20:51     ` Andrey Vagin
2018-09-24 22:02     ` ebiederm
2018-09-24 22:02       ` Eric W. Biederman
2018-09-25  1:42       ` avagin
2018-09-25  1:42         ` Andrey Vagin
2018-09-26 17:36         ` ebiederm
2018-09-26 17:36           ` Eric W. Biederman
2018-09-26 17:59           ` 0x7f454c46 [this message]
2018-09-26 17:59             ` Dmitry Safonov
2018-09-27 21:30           ` tglx
2018-09-27 21:30             ` Thomas Gleixner
2018-09-27 21:41             ` tglx
2018-09-27 21:41               ` Thomas Gleixner
2018-10-01 23:20               ` avagin
2018-10-01 23:20                 ` Andrey Vagin
2018-10-02  6:15                 ` tglx
2018-10-02  6:15                   ` Thomas Gleixner
2018-10-02 21:05                   ` 0x7f454c46
2018-10-02 21:05                     ` Dmitry Safonov
2018-10-02 21:26                     ` tglx
2018-10-02 21:26                       ` Thomas Gleixner
2018-09-28 17:03             ` ebiederm
2018-09-28 17:03               ` Eric W. Biederman
2018-09-28 19:32               ` tglx
2018-09-28 19:32                 ` Thomas Gleixner
2018-10-01  9:05                 ` ebiederm
2018-10-01  9:05                   ` Eric W. Biederman
2018-10-01  9:15                 ` Setting monotonic time? ebiederm
2018-10-01  9:15                   ` Eric W. Biederman
2018-10-01 18:52                   ` tglx
2018-10-01 18:52                     ` Thomas Gleixner
2018-10-02 20:00                     ` arnd
2018-10-02 20:00                       ` Arnd Bergmann
2018-10-02 20:06                       ` tglx
2018-10-02 20:06                         ` Thomas Gleixner
2018-10-03  4:50                         ` ebiederm
2018-10-03  4:50                           ` Eric W. Biederman
2018-10-03  5:25                           ` tglx
2018-10-03  5:25                             ` Thomas Gleixner
2018-10-03  6:14                             ` ebiederm
2018-10-03  6:14                               ` Eric W. Biederman
2018-10-03  7:02                               ` arnd
2018-10-03  7:02                                 ` Arnd Bergmann
2018-10-03  6:14                             ` tglx
2018-10-03  6:14                               ` Thomas Gleixner
2018-10-01 20:51                   ` avagin
2018-10-01 20:51                     ` Andrey Vagin
2018-10-02  6:16                     ` tglx
2018-10-02  6:16                       ` Thomas Gleixner
2018-10-21  1:41               ` [RFC 00/20] ns: Introduce Time Namespace avagin
2018-10-21  1:41                 ` Andrei Vagin
2018-10-21  3:54                 ` avagin
2018-10-21  3:54                   ` Andrei Vagin
2018-10-29 20:33                 ` tglx
2018-10-29 20:33                   ` Thomas Gleixner
2018-10-29 21:21                   ` ebiederm
2018-10-29 21:21                     ` Eric W. Biederman
2018-10-29 21:36                     ` tglx
2018-10-29 21:36                       ` Thomas Gleixner
2018-10-31 16:26                   ` avagin
2018-10-31 16:26                     ` Andrei Vagin

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