Re: Memory problems update (was: Implementing image support for kitty terminal)

[Eli Zaretskii]

> From: Jose Antonio Ortega Ruiz <jao@gnu.org>
> Cc: emacs-devel@gnu.org
> Date: Thu, 22 Sep 2022 18:31:36 +0100
> 
>     (let ((bg (frame-parameter nil 'background-color))
>           (ol "burlywood3")
>           (ul "grey65"))
>       (set-face-attribute 'mode-line nil :box nil :height 1
>                           :background bg :foreground bg
>                           :overline ol :underline ul :extend t)
>       (set-face-attribute 'mode-line-inactive nil :box nil :height 1
>                           :background bg :foreground bg
>                           :underline ul :extend t)))
> 
> now, when i do *not* use the above code, extra RAM per day goes down
> from 100Mb to less than 20Mb.  Does that make any sense?  Maybe it's a
> red-herring.

When you change attributes of a named face, Emacs needs to recompute
all the faces on that frame, cache them, and redisplay the frame.
That definitely consumes memory, and could affect the ability of
glibc to return memory to the OS.