GNU bug report logs -
#66117
30.0.50; `find-buffer-visiting' is slow when opening large number of buffers
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Reported by: Ihor Radchenko <yantar92 <at> posteo.net>
Date: Wed, 20 Sep 2023 08:53:02 UTC
Severity: minor
Found in version 30.0.50
Done: Eli Zaretskii <eliz <at> gnu.org>
Bug is archived. No further changes may be made.
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Message #271 received at 66117 <at> debbugs.gnu.org (full text, mbox):
Stefan Monnier <monnier <at> iro.umontreal.ca> writes:
>>>> It won't be buffer-local-if-changed, so binding it will not be costly.
>>> As mentioned elsewhere in this bug-report we can make `case-fold-search`
>>> into a `DEFVAR_LISP`: it would have no visible impact to ELisp and would
>>> avoid the costly let-bindings.
>> Wouldn't DEFVAR_LISP break major modes that do (setq case-fold-search ...)?
>
> No, it makes no difference to Lisp. It only changes the implementation
> strategy: DEFVAR_LISP stores the value in a global C variable (which
> thus requires more processing when the var is buffer-local, more
> specifically updating the C var when we `set-buffer`), whereas
> DEFVAR_PER_BUFFER stores the value inside the buffer object (which
> thus requires more processing when the var is *not* buffer-local since
> the global value is duplicated in all the buffers where it's not made
> buffer-local).
Do I understand correctly that what is needed to implement your
suggestion is
1. Remove case_fold_search_ slot from buffer objects
2. Use DEFVAR_LISP for case-fold-search
3. Declare case-fold-search buffer-local
4. Replace BVAR(...) references in C with Vcase_fold_search
?
--
Ihor Radchenko // yantar92,
Org mode contributor,
Learn more about Org mode at <https://orgmode.org/>.
Support Org development at <https://liberapay.com/org-mode>,
or support my work at <https://liberapay.com/yantar92>
This bug report was last modified 1 year and 135 days ago.
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