Re: MPS GC and its implications

[Gerd Möllmann]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Gerd Möllmann <gerd.moellmann@gmail.com>
>> Cc: Helmut Eller <eller.helmut@gmail.com>,  acorallo@gnu.org,
>>   emacs-devel@gnu.org
>> Date: Fri, 03 May 2024 13:59:36 +0200
>> 
>> Eli Zaretskii <eliz@gnu.org> writes:
>> 
>> > I'm worried because it sounds like we don't have a clear understanding
>> > how this stuff works, and without that we are basically stabbing in
>> > the dark when faced with a particular issue related to the MPS
>> > migration.
>> 
>> Can't say anything about GDB. Here on macOS, I can, if I want, see the
>> Mach exceptions being handled, and I've landed there in LLDB as well.
>
> The same happens in GDB.  If the result of the exception is SIGSEGV,
> then GDB should kick in, I think.  Didn't Helmut say something several
> days ago that he needs to tell GDB to pass SIGSEGV to Emacs?

Yes, he said he had to ignore some signals in GDB. Or was it let them
pass through?

>> For the rest I can only hope that some confidence will grow over time.
>
> Let's hope.  But understanding is better than confidence.
>
>> Have you read the old MPS paper from 2002? Maybe that helps.
>
> Not yet.  Too busy.

I've also found a very old paper about barriers (90s) which I could send
you if you want. More modern papers are often behind some walls (ACM,
etc.). Maybe Stefan Monnier could recommend something newer.