From: Alan Mackenzie <acm@muc.de>
To: Ravine Var <ravine.var@gmail.com>
Cc: 25706@debbugs.gnu.org
Subject: bug#25706: 26.0.50; Slow C file fontification
Date: Thu, 10 Dec 2020 08:08:44 +0000 [thread overview]
Message-ID: <X9HXjLpfsNurGlaU@ACM> (raw)
In-Reply-To: <874kkvh0ne.fsf@gmail.com>
Hello again, Ravine.
On Wed, Dec 09, 2020 at 13:17:23 +0530, Ravine Var wrote:
> I came across another place where a similar lockup happens
> (even with the patches posted here).
> https://gitlab.com/wireshark/wireshark/-/raw/master/epan/dissectors/packet-rrc.c
> Towards the end of the file, once we get to the function
> proto_register_rrc(void), the slowdown of scrolling starts and eventually
> things freeze.
Outch! That's a 50,000 line long function. ;-( I've lost some naivety
about "reasonableness" in the past week or two.
> Just copying that function to a smaller C file is enough to
> reproduce the issue. (I found that C-M-h is a nifty command to do this.)
> I can open a new bug report if required.
Would you do this, please. The mechanism for the slowdown in that
function is entirely different from that in the .h files with lots of
macros. In the .c file, there are lots and lots of braces, and it seems
we need a new cache to handle them faster. In the .h files, there are
no braces, and we needed to put limits into backward searches.
Thanks again for taking the trouble to report all these bugs.
--
Alan Mackenzie (Nuremberg, Germany).
next prev parent reply other threads:[~2020-12-10 8:08 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-13 18:20 bug#25706: 26.0.50; Slow C file fontification Sujith
2020-11-30 11:26 ` Lars Ingebrigtsen
2020-11-30 11:37 ` Lars Ingebrigtsen
2020-11-30 12:46 ` Mattias Engdegård
2020-11-30 12:49 ` Lars Ingebrigtsen
2020-11-30 16:27 ` Eli Zaretskii
2020-11-30 16:38 ` Alan Mackenzie
2020-11-30 16:53 ` Mattias Engdegård
2020-11-30 17:04 ` Mattias Engdegård
2020-12-01 5:48 ` Ravine Var
2020-12-01 13:34 ` Mattias Engdegård
2020-12-01 9:29 ` Alan Mackenzie
2020-12-01 9:44 ` martin rudalics
2020-12-01 10:07 ` Alan Mackenzie
2020-12-01 9:21 ` Alan Mackenzie
2020-12-01 12:03 ` Mattias Engdegård
2020-12-01 12:57 ` Alan Mackenzie
2020-12-01 14:07 ` Mattias Engdegård
2020-12-01 15:27 ` Alan Mackenzie
2020-12-01 18:59 ` Mattias Engdegård
2020-12-02 10:15 ` Alan Mackenzie
[not found] ` <X8dpQeGaDD1w3kXX@ACM>
2020-12-02 15:06 ` Mattias Engdegård
2020-12-03 10:48 ` Alan Mackenzie
2020-12-03 14:03 ` Mattias Engdegård
2020-12-04 21:04 ` Alan Mackenzie
[not found] ` <X8qkcokfZGbaK5A2@ACM>
2020-12-05 15:20 ` Mattias Engdegård
2020-12-08 18:42 ` Alan Mackenzie
[not found] ` <X8/JG7eD7SfkEimH@ACM>
2020-12-08 19:32 ` Mattias Engdegård
2020-12-09 7:31 ` Ravine Var
2020-12-09 7:47 ` Ravine Var
2020-12-10 8:08 ` Alan Mackenzie [this message]
2020-12-09 18:46 ` Alan Mackenzie
[not found] ` <X9Ebn7hKnG/vpDcZ@ACM>
2020-12-09 20:04 ` Eli Zaretskii
2020-12-09 20:32 ` Alan Mackenzie
2020-12-10 17:02 ` Ravine Var
2020-12-10 20:02 ` Alan Mackenzie
2020-12-11 10:55 ` Ravine Var
2020-12-12 15:34 ` Alan Mackenzie
[not found] ` <X9TjCeydJaE2mpK8@ACM>
2020-12-14 7:20 ` Ravine Var
2020-12-14 11:44 ` Alan Mackenzie
2020-12-15 4:01 ` Ravine Var
2020-12-15 12:27 ` Alan Mackenzie
2020-12-09 17:00 ` Mattias Engdegård
2020-12-10 12:26 ` Alan Mackenzie
2020-11-30 18:30 ` Alan Mackenzie
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