Difference between revisions of "Time namespace"

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[https://github.com/checkpoint-restore/criu/pull/1002 The time namespace support] in CRIU has been merged in the [[Download/criu/3.14 | 3.14 release]].  
 
[https://github.com/checkpoint-restore/criu/pull/1002 The time namespace support] in CRIU has been merged in the [[Download/criu/3.14 | 3.14 release]].  
  
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=TODO=
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[https://lwn.net/Articles/766089/ LWN article about time namespaces]
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==Maybe later==
 
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* Make start-time remain "unchanged" after C/R
 
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* arm64/arm32/s390/power64 - add archs vvar support (nit: big/little-endianess for timespec::nsec)
 
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* REALTIME-related:
 
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** REALTIME offsets
 
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** vvar offsets will need synchronization (like gtod_read_begin()/gtod_read_retry())
 
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** vfs modification/creation time should work
 
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** starttime in /proc/pid/stat
 
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** btime in /proc/stat
 
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** utime()/utimes()/futimesat() (with times == NULL)
 
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** utimensat()/futimens() - with UTIME_NOW
 
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** mq_timedsend()/mq_timedreceive()
 
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** semtimedop()
 
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* Adjtime (too complicated for PoC)
 
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* Cpu time for thread/pid/pgid (times())
 
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* /proc/stat ticks? (top uses them e.g.)
 
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* pid creation time (probably different unrelated API)
 
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* clock_tai - if we care about isolation from host's time
 
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* What about other kinds of counters like perf events and trace events?
 
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=Git=
 
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* [https://github.com/0x7f454c46/linux/tree/wip/time-ns https://github.com/0x7f454c46/linux/tree/wip/time-ns]
 
  
 
=Links=
 
=Links=
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* [https://lwn.net/Articles/817650/ 04/2020 <nowiki>[PATCH v3 0/6] arm64: add the time namespace support</nowiki>]
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* [https://lore.kernel.org/lkml/158016896588.31887.14143226032971732742.tglx@nanos.tec.linutronix.de/ 01/2020<nowiki> [GIT pull] timers/core for 5.6-rc1</nowiki>]
 
* [https://lkml.kernel.org/r/20191112012724.250792-1-dima@arista.com 11/2019 PATCHv8 00/34 kernel: Introduce Time Namespace]
 
* [https://lkml.kernel.org/r/20191112012724.250792-1-dima@arista.com 11/2019 PATCHv8 00/34 kernel: Introduce Time Namespace]
 
* [https://lkml.kernel.org/r/20190206001107.16488-1-dima@arista.com 02/2019 PATCH 00/32 kernel: Introduce Time Namespace]
 
* [https://lkml.kernel.org/r/20190206001107.16488-1-dima@arista.com 02/2019 PATCH 00/32 kernel: Introduce Time Namespace]

Latest revision as of 14:53, 29 April 2020

The time namespace support has been merged in the 5.6 kernel. The current implementation allows setting per-namespace offsets to the system monotonic and boot-time clocks.

The time namespace support in CRIU has been merged in the 3.14 release.

LWN article about time namespaces

Links[edit]

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