[lttng-dev] [RFC] Deprecating RCU signal flavor

[Ondřej Surý]

Hi,

we (ISC) have no intention of using signal based URCU in BIND 9. Our plan relies on using the QSBR flavor as BIND 9 is internally event-loop based with natural quiescent states.

Ondrej 
--
Ondřej Surý <ondrej at sury.org> (He/Him)

> On 10. 5. 2023, at 23:10, Olivier Dion via lttng-dev <lttng-dev at lists.lttng.org> wrote:
> 
> Hi all,
> 
> We have the intention of deprecating the urcu-signal flavor in the
> future.  We are asking users of URCU for _feedback_ on this before
> going any further.
> 
> Part of this decision is that we are adding support for TSAN in URCU and
> the signal flavor deadlocks with TSAN.  It is also my understanding that
> the urcu-signal flavor was historically made as a fallback for system
> lacking the membarrier(2) system call.  Nowadays, most systems have
> support for that system call, making the urcu-signal an artifact of the
> past.
> 
> The following is a proposed timeline of events:
> 
>  1. Asking for feedback from users of URCU (this message)
>  2. Disabling the signal flavor by default and adding --enable-flavor-signal
>  3. Removing the signal flavor
> 
> -- 
> Olivier Dion
> EfficiOS Inc.
> https://www.efficios.com
> 
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