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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Garbage collector: is 800kb a good default?
Date: Fri, 10 Apr 2020 19:49:04 +0300
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To: Bruno =?utf-8?Q?F=C3=A9lix?= Rezende Ribeiro <oitofelix@gnu.org>
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In-Reply-To: <87blnzh0wz.fsf@oitofelix.com> (message from Bruno
 =?utf-8?Q?F=C3=A9lix?= Rezende
 Ribeiro on Fri, 10 Apr 2020 11:26:36 -0300)
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> From: Bruno Félix Rezende Ribeiro <oitofelix@gnu.org>
> Cc: Dmitrii Korobeinikov <dim1212k@gmail.com>,  emacs-devel@gnu.org
> Date: Fri, 10 Apr 2020 11:26:36 -0300
> 
> > On GNU/Linux, Emacs doesn't really return malloc'ed memory to the
> > system, so once the memory footprint grows, it more or less stays that
> > way even after GC.
> 
> Really?  Why is that?

Because that's how malloc/free are implemented in glibc.