Re: Opportunistic GC

[Pip Cet]

On Mon, Mar 8, 2021 at 4:27 PM Eli Zaretskii <eliz@gnu.org> wrote:
> > From: Pip Cet <pipcet@gmail.com>
> > Date: Mon, 8 Mar 2021 15:39:07 +0000
> > Cc: rudalics@gmx.at, Stefan Monnier <monnier@iro.umontreal.ca>, 
> > emacs-devel@gnu.org
> >
> > > 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)?
> >
> > There'd be one pointer per cons block, not one per cons, so the factor
> > is 1.008 on this machine.
>
> And how do you make sure the mark bits will be on a different/separate
> page?

We allocate cons blocks aligned to physical pages. The mark bits don't
live in the cons block. Therefore, they can't live on the same page as
a cons block.

What am I missing?

Pip