* [lttng-dev] [RELEASE] Userspace RCU 0.12.4 and 0.13.2
@ 2022-08-18 20:07 Mathieu Desnoyers via lttng-dev
0 siblings, 0 replies; 2+ messages in thread
From: Mathieu Desnoyers via lttng-dev @ 2022-08-18 20:07 UTC (permalink / raw)
To: linux-kernel, lttng-dev, rp
Cc: paulmck, Stephen Hemminger, Alan Stern, Lai Jiangshan, lwn
[ re-sending without html headers. My email client managed to add those without me realizing it. ]
Hi,
This is stable release announcement for the Userspace RCU project.
It covers the two currently maintained stable branches: 0.12 and 0.13,
respectively with releases v0.12.4 and v0.13.2.
Especially for the spurious futex wakeup fix, users of the 0.12 and 0.13 (or older)
liburcu branches are recommended to upgrade.
* Noteworthy in these releases:
- Handle spurious futex wakeups in urcu-qsbr, urcu, urcu-wait, defer_rcu, call_rcu,
and workqueue code. This has been known to cause issues where the workqueue
worker thread spuriously takes nearly 100% of CPU time.
- Change method used by _rcu_dereference ot strip type constness.
Rather than using pointer arithmetic (which does not work with opaque types),
rely on a statement expression trick.
- Fix support for Linux systems where sysconf(_SC_NPROCESSORS_CONF) can
return a value less than max cpu id.
Project website: https://liburcu.org
Feedback is welcome!
Thanks,
Mathieu
--
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com
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^ permalink raw reply [flat|nested] 2+ messages in thread
* [lttng-dev] [RELEASE] Userspace RCU 0.12.4 and 0.13.2
@ 2022-08-18 19:56 Mathieu Desnoyers via lttng-dev
0 siblings, 0 replies; 2+ messages in thread
From: Mathieu Desnoyers via lttng-dev @ 2022-08-18 19:56 UTC (permalink / raw)
To: linux-kernel, lttng-dev, rp
Cc: paulmck, Stephen Hemminger, Alan Stern, Lai Jiangshan, lwn
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Hi,
This is stable release announcement for the Userspace RCU project.
It covers the two currently maintained stable branches: 0.12 and 0.13,
respectively with releases v0.12.4 and v0.13.2.
Especially for the spurious futex wakeup fix, users of the 0.12 and 0.13 (or older)
liburcu branches are recommended to upgrade.
* Noteworthy in these releases:
- Handle spurious futex wakeups in urcu-qsbr, urcu, urcu-wait, defer_rcu, call_rcu,
and workqueue code. This has been known to cause issues where the workqueue
worker thread spuriously takes nearly 100% of CPU time.
- Change method used by _rcu_dereference ot strip type constness.
Rather than using pointer arithmetic (which does not work with opaque types),
rely on a statement expression trick.
- Fix support for Linux systems where sysconf(_SC_NPROCESSORS_CONF) can
return a value less than max cpu id.
Project website: https://liburcu.org
Feedback is welcome!
Thanks,
Mathieu
--
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com
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https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
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