GNU bug report logs - #45200
Wishlist: There should be a `malloc-trim' function

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From: Konstantin Kharlamov <hi-angel <at> yandex.ru>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: monnier <at> iro.umontreal.ca, 45200 <at> debbugs.gnu.org
Subject: bug#45200: [PATCH] Force Glibc to free the memory freed
Date: Tue, 26 Jan 2021 01:28:01 +0300

On Mon, 2021-01-25 at 17:17 -0500, DJ Delorie wrote:
> Eli Zaretskii <eliz <at> gnu.org> writes:
> > Thanks, but is it really a good idea to call malloc_trim each time we
> > free some chunk of memory?
> 
> malloc_trim() is very expensive relative to free(), partly because of
> what it needs to do, and partly because it flushes the fastbins cache.
> If you call it every, say, 1000 iterations of free, that might suffice.
> Or perhaps after each GC run.

(un-ccing Glibc maintainers as this question is Emacs-specific)

After a GC run, would that be at the end of `garbage_collect` function as Stefan
mentioned?

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