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

Paul E. McKenney paulmck at kernel.org
Tue May 16 08:16:27 EDT 2023

On Wed, May 10, 2023 at 05:10:27PM -0400, Olivier Dion 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.

No objections here.  I will need to do a little rework of my book, but
I can do that.  ;-)

> 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

Makes sense to me!

							Thanx, Paul

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