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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Question about (excessive?) ram usage when many overlays (with
 large vscroll)
Date: Wed, 27 Apr 2022 20:18:40 +0300
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To: Stefan Monnier <monnier@iro.umontreal.ca>
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In-Reply-To: <jwv7d7a1me4.fsf-monnier+emacs@gnu.org> (message from Stefan
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> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: Eli Zaretskii <eliz@gnu.org>,  Emacs Devel <emacs-devel@gnu.org>
> Date: Wed, 27 Apr 2022 13:13:04 -0400
> 
> > Thanks again Eli for looking into this quickly.  Over here, the memory
> > does not even get released after killing the buffer, while the
> > overlays are 'bound' in a buffer local list variable.
> 
> IIUC current glibc basically never returns malloc'd memory to the OS.

That is NOT true, AFAIU.  It can do that in some cases, but it doesn't
_always_ do that.