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

[Jose A Ortega Ruiz <jao@gnu.org>]

On Fri, Sep 23 2022, Eli Zaretskii wrote:

>> 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.

That's fair, but i typically only change those attribitues once, at
startup, and almost never create new frames, so in principle emacs will
only allocate that extra memory once, won't it?