From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.bugs Subject: bug#56682: Fix the long lines font locking related slowdowns Date: Mon, 15 Aug 2022 14:51:22 +0300 Message-ID: <83a685iv2d.fsf@gnu.org> References: <83mtcgy44k.fsf@gnu.org> <83k07jx5jn.fsf@gnu.org> <866e510d-a060-7daa-d002-97861d056fa7@yandex.ru> <1144021660321893@iva5-64778ce1ba26.qloud-c.yandex.net> <12348081660379417@sas2-a098efd00d24.qloud-c.yandex.net> <66bbbb95983414e79637@heytings.org> <66bbbb95983475c5f3b0@heytings.org> <0d67f253-c080-d750-c2cb-4a9591ff8c6c@yandex.ru> <83lerrl734.fsf@gnu.org> <83wnbbj7v4.fsf@gnu.org> <75c316c0-3346-e702-b114-41a7f899deb1@yandex.ru> <5900f20836ca3f305df8@heytings.org> <8ef8eaba-1add-e87e-247e-71888beaf1f8@yandex.ru> <837d3ak8lf.fsf@gnu.org> <14516fce-8c35-1ce7-1314-44a3d79e8ba7@yandex.ru> <834jyek7df.fsf@gnu.org> <29b571a3-5a47-fed9-3147-f30864134c41@yandex.ru> <83tu6ei6e0.fsf@gnu.org> Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="27077"; mail-complaints-to="usenet@ciao.gmane.io" Cc: 56682@debbugs.gnu.org, gregory@heytings.org, monnier@iro.umontreal.ca To: Dmitry Gutov Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Mon Aug 15 13:52:47 2022 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1oNYeD-0006le-OZ for geb-bug-gnu-emacs@m.gmane-mx.org; Mon, 15 Aug 2022 13:52:45 +0200 Original-Received: from localhost ([::1]:50470 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1oNYeC-0004xa-Ro for geb-bug-gnu-emacs@m.gmane-mx.org; Mon, 15 Aug 2022 07:52:44 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:33440) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oNYdW-0004wE-FP for bug-gnu-emacs@gnu.org; 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Original-Received: from [87.69.77.57] (port=4284 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oNYd6-0001Y8-By; Mon, 15 Aug 2022 07:51:36 -0400 In-Reply-To: (message from Dmitry Gutov on Mon, 15 Aug 2022 13:06:14 +0300) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.io gmane.emacs.bugs:239782 Archived-At: > Date: Mon, 15 Aug 2022 13:06:14 +0300 > Cc: 56682@debbugs.gnu.org, gregory@heytings.org, monnier@iro.umontreal.ca > From: Dmitry Gutov > > > And btw, I have very different impression of what happens with 100x > > larger narrowing on my machine and with unoptimized builds. > > Given what we've seen about your parse-partial-sexp's performance (10x > slower than mine), I would hope for someone to figure out why it's so > slow in your unoptimized build. But if it doesn't happen, you would > probably use a different threshold/narrowing radius (through customization). > > It would make sense for our defaults not to be tailored to this very > particular development rig. If you are willing to lose my ability to debug complex redisplay problems in many cases, sure, go ahead. > >> So yeah, the font-lock related widen/narrowing logic should indeed live > >> in one place. And until now it has resided in font-lock-fontify-region. > > > > Since when is font-lock-fontify-region specific to a language? It is > > as general as xdisp.c. > > syntax-propertize is general, and yet it invokes language-specific rules > (through syntax-propertize-function). Nothing prevents xdisp.c from invoking those same rules if needed.