From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Stefan Monnier via "Bug reports for GNU Emacs, the Swiss army knife of text editors" Newsgroups: gmane.emacs.bugs Subject: bug#56682: Fix the long lines font locking related slowdowns Date: Fri, 12 Aug 2022 22:01:54 -0400 Message-ID: References: <640c2e07-98e1-96d6-bb02-19f5f03f637f@yandex.ru> <834jyq29o1.fsf@gnu.org> <92da07bd028e3ede61a6@heytings.org> <47894c57-dd8b-5778-240a-3fa6540e4d37@yandex.ru> <92da07bd02941d5537e9@heytings.org> <5308e3b5-a160-17d7-77ee-b1d00acfa20d@yandex.ru> <92da07bd02a6cc861e1a@heytings.org> <837d3lzv8n.fsf@gnu.org> <2c8d6755-cfe2-6559-3fde-3fa30ffb411e@yandex.ru> <83mtcgy44k.fsf@gnu.org> <83k07jx5jn.fsf@gnu.org> <866e510d-a060-7daa-d002-97861d056fa7@yandex.ru> <1144021660321893@iva5-64778ce1ba26.qloud-c.yandex.net> Reply-To: Stefan Monnier Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="22423"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux) Cc: 56682@debbugs.gnu.org, Eli Zaretskii , Dmitry Gutov To: Gregory Heytings Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Sat Aug 13 04:03:19 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 1oMgUf-0005cS-85 for geb-bug-gnu-emacs@m.gmane-mx.org; Sat, 13 Aug 2022 04:03:17 +0200 Original-Received: from localhost ([::1]:60008 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1oMgUe-0003IX-4y for geb-bug-gnu-emacs@m.gmane-mx.org; Fri, 12 Aug 2022 22:03:16 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:46532) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oMgUQ-0003IP-BT for bug-gnu-emacs@gnu.org; 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Fri, 12 Aug 2022 22:01:55 -0400 (EDT) In-Reply-To: (Gregory Heytings's message of "Fri, 12 Aug 2022 21:31:58 +0000") 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:239477 Archived-At: > I can only repeat that the only ways to improve font locking in a non-local > way (or at least, the only ways that were identified in the discussions so > far) are either to improve the speed of syntax-ppss by an order of > magnitude, in which case it would perhaps become feasible to allow > syntax-ppss to have access to the whole buffer, or to equip syntax-ppss with > heuristics to make it work "as well as possible" even when it only has > access to a portion of the buffer. But the locked narrowing is applied based on the presence of long-lines rather than based on the total size of the buffer. I think we'll want to decouple the two because they aren't quite the same (e.g. in many cases the time taken by `syntax-ppss` doesn't depend on the length of lines, whereas the time taken by `font-lock-keywords` rues does not depend on the total buffer size). Stefan