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bug#45898: 27.1; wedged in redisplay again
From: |
Eli Zaretskii |
Subject: |
bug#45898: 27.1; wedged in redisplay again |
Date: |
Fri, 01 Jul 2022 09:04:19 +0300 |
> From: Gerd Möllmann <gerd.moellmann@gmail.com>
> Date: Fri, 1 Jul 2022 06:42:23 +0200
> Cc: Eli Zaretskii <eliz@gnu.org>,
> larsi@gnus.org,
> psainty@orcon.net.nz,
> Emacs-hacker2018@jovi.net,
> 45898@debbugs.gnu.org
>
>
> [1:text/plain Hide]
>
>
> > On 2022-06-30,, at 21:56 , Stefan Monnier <monnier@iro.umontreal.ca> wrote:
> >
> >>> Unsuprisingly so: none of `C-n/C-p/C-v/...` involve font-lock or
> >>> jit-lock either during their operation or during the
> >>> subsequent redisplay phase in the current code: the one-line is all
> >>> fontified once and for all when you open the file and after that
> >>> font-lock is not involved any more (until you make an edit, that is).
> >>
> >> That's only true if max-redisplay-ticks is zero.
> >
> > Why would that make a difference? When I try `master` with this set to
> > 100000, the file still shows up with font-locking, so apparently it's
> > been fully font-locked despite `max-redisplay-ticks` and after that
> > font-locking (and syntax-propertize) won't make any difference any more
> > (until the buffer is edited) since they're already done.
> > [ Of course font-locking (and syntax-propertize) still do have an
> > effect in that the text-properties they applied can impact the time it
> > takes for the redisplay to do its job; so by "won't make any difference"
> > I mean that 0-cycles will be spent running font-lock of
> > syntax-propertize code. ]
>
> Would it be possible to run this with gprof profiling? I think that could
> give some clues what is going on.
Or (on GNU/Linux only) under 'prof' -- which doesn't require you to
build a special version of Emacs, and still produces detailed CPU
usage info.
bug#45898: 27.1; wedged in redisplay again, Gerd Möllmann, 2022/07/01
bug#45898: 27.1; wedged in redisplay again, Eli Zaretskii, 2022/07/01