bug#16420: 24.3; Drawing an overlay causes 100% cpu utilization

[Dmitry Antipov]

On 01/12/2014 02:01 AM, Lars Andersen wrote:

> Starting from emacs -Q:
>
> (defface flycheck-warning
> '((((supports :underline (:style wave)))
> :underline (:style wave :color "DarkOrange"))
> (t
> :underline t :inherit warning))
> "Flycheck face for warnings."
> :package-version '(flycheck . "0.13")
> :group 'flycheck-faces)
> (let ((ov (make-overlay (point) (point-at-eol)))
> (face 'flycheck-warning))
> (overlay-put ov 'face face)) ;; C-x C-e this last form to reproduce

Note that C-x C-e has no visible effect until you evaluate first
'defface' form too.

IIUC Emacs itself is still responsible after C-x C-e; could you
please eval (overlays-in (point-min) (point-max)) immediately after?

> After evaluating this elisp, top reports 100% CPU utilization from X.

What about Emacs CPU utilization, and RSS of X and Emacs as well?

Dmitry