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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Opportunistic GC
Date: Mon, 08 Mar 2021 17:23:09 +0200
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> From: Pip Cet <pipcet@gmail.com>
> Date: Mon, 8 Mar 2021 15:02:18 +0000
> Cc: rudalics@gmx.at, Stefan Monnier <monnier@iro.umontreal.ca>, emacs-devel@gnu.org
> 
> For conses, it's easy. Instead of keeping the mark bits in the cons
> block, we keep a pointer to the mark bits in the cons block, and
> allocate the mark bits separately and (hopefully) on a different page.

And for others?

Also, doesn't it mean you increase the memory required for a cons by a
factor of 1.5, as it now needs one more member (3 words instead of 2)?