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Time namespace (edit)

Revision as of 04:43, 23 April 2020

70 bytes removed , 04:43, 23 April 2020

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~~Two things (for now) we want~~ to ~~solve with this:~~

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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.

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~~# Shift timer's offsets~~

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~~# Make start~~-time ~~remain "unchanged" after C/R~~

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~~# Continuous flow of monotonic time (CLOCK_MONOTONIC)~~.

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~~What about other kinds of counters like perf events and trace events?~~

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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]].

=TODO=

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==~~Required in RFC~~==

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==Maybe later==

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* ~~selftests to test all we've added~~

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* Make start-time remain "unchanged" after C/R

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* TIME_NS iffdefery everywhere

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~~==Maybe later==~~

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* CLONE_NEWTIME reuses the last free flag from sys_clone() - ~~any way to still keep extensibility for the syscall?~~

* arm64/arm32/s390/power64 - add archs vvar support (nit: big/little-endianess for timespec::nsec)

* REALTIME-related:

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** mq_timedsend()/mq_timedreceive()

** semtimedop()

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** timerfd

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** timer_create()

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** COARSE times

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** clock_nanosleep()

* Adjtime (too complicated for PoC)

* Cpu time for thread/pid/pgid (times())

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* pid creation time (probably different unrelated API)

* 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?

=Git=

Avagin

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