Re: MPS: User GC customizations

[Eli Zaretskii <eliz@gnu.org>]

> From: Gerd Möllmann <gerd.moellmann@gmail.com>
> Cc: yantar92@posteo.net,  pipcet@protonmail.com,  emacs-devel@gnu.org,
>   eller.helmut@gmail.com
> Date: Thu, 04 Jul 2024 16:30:06 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> >> What this variable does is give MPS notice that the client is currently
> >> idle and it might be a good time to do some work.
> >
> > Is that really what this variable does?  My reading of the
> > documentation is that it tells MPS how soon to stop GC which it
> > started when Emacs was idle.  IOW, it's not about _triggering_ GC,
> > it's about _ending_ it.  And the reason, AFAIU, is to avoid making
> > Emacs responses slow because MPS started GC when it detected that
> > Emacs is idle.
> 
> I'm taking my view from this;:

I'm not sure what you are saying.  You've cited exactly the same text
as I did, but didn't answer ny real question: does this variable work
as you said above ("give MPS notice that the client is currently
idle") or like I interpret it: tell MPS how much time it's okay to
spend in GC which it started when Emacs was idle?

> (Haven't found out yet to prevent full collections with a message "client
> predicts plenty of idle time" or some such yet. Please see the comment
> in igc.c where mps_arena_step is called.)

Sure.  But how is this relevant to the issue at hand, may I ask?