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* bug-reference-prog-mode slows down CC Mode's scrolling by ~7%
@ 2021-09-01 17:33 Alan Mackenzie
  2021-09-01 17:44 ` Eli Zaretskii
  2021-09-01 20:59 ` Stefan Monnier
  0 siblings, 2 replies; 74+ messages in thread
From: Alan Mackenzie @ 2021-09-01 17:33 UTC (permalink / raw)
  To: emacs-devel

Hello, Emacs.

In the .dir-locals in our source tree, the entry for C Mode enables
bug-reference-prog-mode.

This minor mode makes direct use of jit-lock-functions, the low level
hook which connects jit-lock with font-lock.

The jit-lock functions have a feature whereby, when fontifying a
500-byte chunk, font-lock-fontify-region notifies jit-lock of the actual
region just fontified, which is typically bigger than the suggested 500
bytes.  This enables jit lock to proceed through the buffer without
fontifying the same text twice.

However, this mechanism is rendered ineffective if a second function is
add-hook'd onto jit-lock-functions.  Maybe this could be fixed, though
it looks difficult.

When applied to C Mode, bug-reference-prog-mode slows down a scroll from
point-min to point-max by around 7%.

Just how useful is bug-reference-prog-mode?  Is it really worth this 7%
slowdown?

-- 
Alan Mackenzie (Nuremberg, Germany).



^ permalink raw reply	[flat|nested] 74+ messages in thread

end of thread, other threads:[~2021-09-18 11:59 UTC | newest]

Thread overview: 74+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2021-09-01 17:33 bug-reference-prog-mode slows down CC Mode's scrolling by ~7% Alan Mackenzie
2021-09-01 17:44 ` Eli Zaretskii
2021-09-01 17:55   ` Alan Mackenzie
2021-09-01 18:01     ` Eli Zaretskii
2021-09-01 18:20       ` Alan Mackenzie
2021-09-01 18:28         ` Eli Zaretskii
2021-09-01 19:19           ` Alan Mackenzie
2021-09-01 20:59 ` Stefan Monnier
2021-09-02  6:26   ` Eli Zaretskii
2021-09-02 16:57   ` Alan Mackenzie
2021-09-02 18:46     ` Stefan Monnier
2021-09-02 19:24       ` Alan Mackenzie
2021-09-02 21:08         ` Alan Mackenzie
2021-09-03  6:16           ` Eli Zaretskii
2021-09-03 12:30             ` Stefan Monnier
2021-09-03 12:38               ` Eli Zaretskii
2021-09-03 22:25                 ` Stefan Monnier
2021-09-04  6:13                   ` Eli Zaretskii
2021-09-04 13:36                     ` Stefan Monnier
2021-09-04 13:55                       ` Eli Zaretskii
2021-09-04 14:44                         ` Stefan Monnier
2021-09-04 14:56                           ` Eli Zaretskii
2021-09-04 15:55                             ` Stefan Monnier
2021-09-04 16:12                               ` Eli Zaretskii
2021-09-04 16:24                                 ` Stefan Monnier
2021-09-04 16:28                                   ` Eli Zaretskii
2021-09-04 16:40                                     ` Stefan Monnier
2021-09-03  6:10         ` Eli Zaretskii
2021-09-03 10:47           ` Alan Mackenzie
2021-09-03 11:24             ` Eli Zaretskii
2021-09-03 16:15               ` Alan Mackenzie
2021-09-03 12:27             ` Stefan Monnier
2021-09-03 12:19           ` Stefan Monnier
2021-09-03 12:35             ` Eli Zaretskii
2021-09-03 16:52           ` Alan Mackenzie
2021-09-03 20:51             ` Alan Mackenzie
2021-09-04  6:09               ` Eli Zaretskii
2021-09-04 14:50                 ` Alan Mackenzie
2021-09-04 15:00                   ` Stefan Monnier
2021-09-04 15:32                     ` Alan Mackenzie
2021-09-04 15:36                       ` Eli Zaretskii
2021-09-04 15:43                         ` Alan Mackenzie
2021-09-04 15:48                           ` Eli Zaretskii
2021-09-04 16:05                             ` Alan Mackenzie
2021-09-04 16:15                               ` Eli Zaretskii
2021-09-06 10:46                                 ` Alan Mackenzie
2021-09-06 11:10                                   ` Eli Zaretskii
2021-09-06 19:08                                     ` Alan Mackenzie
2021-09-06 19:23                                       ` Eli Zaretskii
2021-09-18 11:37                                         ` Alan Mackenzie
2021-09-18 11:59                                           ` Eli Zaretskii
2021-09-06 21:59                                       ` andrés ramírez
2021-09-07 19:47                                         ` Alan Mackenzie
2021-09-07 17:57                                           ` andrés ramírez
2021-09-06 13:24                                   ` Stefan Monnier
2021-09-04 16:06                       ` Stefan Monnier
2021-09-04 16:23                         ` Eli Zaretskii
2021-09-04 16:39                           ` Stefan Monnier
2021-09-04 17:19                             ` Eli Zaretskii
2021-09-04 17:47                               ` Stefan Monnier
2021-09-04 18:10                                 ` Eli Zaretskii
2021-09-04 18:40                                   ` Stefan Monnier
2021-09-11 12:49                                     ` Eli Zaretskii
2021-09-11 17:04                                       ` Stefan Monnier
2021-09-11 17:17                                         ` Eli Zaretskii
2021-09-11 18:00                                           ` Stefan Monnier
2021-09-11 18:16                                             ` Eli Zaretskii
2021-09-11 19:55                                               ` Stefan Monnier
2021-09-12  3:51                                                 ` Eli Zaretskii
2021-09-12 16:41                                                   ` Stefan Monnier
2021-09-12 16:53                                                     ` Eli Zaretskii
2021-09-12 17:41                                                       ` Stefan Monnier
2021-09-12 17:55                                                         ` Eli Zaretskii
2021-09-12 21:11                                                           ` Stefan Monnier

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