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

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From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: carlos <at> redhat.com, fweimer <at> redhat.com, dj <at> redhat.com, 45200 <at> debbugs.gnu.org, Konstantin Kharlamov <hi-angel <at> yandex.ru>
Subject: bug#45200: [PATCH] Force Glibc to free the memory freed
Date: Tue, 26 Jan 2021 10:30:07 -0500

> That'd be easy to implement, but I'm not yet sure it's the best
> alternative.  In particular, I'd like to have some idea regarding how
> much time such a call could take.  In some usage patterns Emacs calls
> GC very frequently, which slows down command execution and makes Emacs
> less responsive.

The most important case where this happens is during phases of creation
of large new structures (e.g. while loading a large package like Org),
where a lot of memory is allocated without generating much garbage, so
every time we run the GC that time is mostly wasted (since we don't
recover any garbage) and calling malloc_trim would also be useless in
those cases.


        Stefan

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