From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Gregory Heytings Newsgroups: gmane.emacs.bugs Subject: bug#56682: Fix the long lines font locking related slowdowns Date: Thu, 04 Aug 2022 11:21:23 +0000 Message-ID: <3d639ea1262ab1d85406@heytings.org> References: <8c7321f2f3ac52bfee4b@heytings.org> <8c7321f2f3ec1ef81af9@heytings.org> <02e83b0e-1b5c-fe75-6e59-1f8ddff82d37@yandex.ru> <96f28fd8-6744-1925-0631-0095099362dd@yandex.ru> <74ddc877f1e81f399eea@heytings.org> <74ddc877f14320d7852f@heytings.org> <5f6988c781f1253541e3@heytings.org> <5f6988c781a5686a88d1@heytings.org> <83les44k2i.fsf@gnu.org> <87k07ottlw.fsf@gnus.org> Mime-Version: 1.0 Content-Type: text/plain; format=flowed; charset=us-ascii Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="29616"; mail-complaints-to="usenet@ciao.gmane.io" Cc: 56682@debbugs.gnu.org, Eli Zaretskii , Stefan Monnier , dgutov@yandex.ru To: Lars Ingebrigtsen Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Thu Aug 04 13:22:30 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 1oJYvu-0007Vx-4R for geb-bug-gnu-emacs@m.gmane-mx.org; Thu, 04 Aug 2022 13:22:30 +0200 Original-Received: from localhost ([::1]:60444 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1oJYvt-0001eL-0T for geb-bug-gnu-emacs@m.gmane-mx.org; Thu, 04 Aug 2022 07:22:29 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:54516) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oJYvS-0001cj-7n for bug-gnu-emacs@gnu.org; Thu, 04 Aug 2022 07:22:02 -0400 Original-Received: from debbugs.gnu.org ([209.51.188.43]:33447) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1oJYvR-0007dp-VB for bug-gnu-emacs@gnu.org; Thu, 04 Aug 2022 07:22:01 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1oJYvR-00049p-MH for bug-gnu-emacs@gnu.org; Thu, 04 Aug 2022 07:22:01 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Gregory Heytings Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Thu, 04 Aug 2022 11:22:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 56682 X-GNU-PR-Package: emacs Original-Received: via spool by 56682-submit@debbugs.gnu.org id=B56682.165961208815935 (code B ref 56682); Thu, 04 Aug 2022 11:22:01 +0000 Original-Received: (at 56682) by debbugs.gnu.org; 4 Aug 2022 11:21:28 +0000 Original-Received: from localhost ([127.0.0.1]:51429 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1oJYut-00048x-Sa for submit@debbugs.gnu.org; Thu, 04 Aug 2022 07:21:28 -0400 Original-Received: from heytings.org ([95.142.160.155]:38524) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1oJYur-00048n-F5 for 56682@debbugs.gnu.org; Thu, 04 Aug 2022 07:21:26 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=heytings.org; s=20220101; t=1659612084; bh=BVG0K5/0VMZBQ3uw2bu2Y3CMvxLRLgMHlHuSneRpkm8=; h=Date:From:To:cc:Subject:In-Reply-To:Message-ID:References:From; b=r6CfZFI283QiUib5AMAyMryLOYjZhioO59hsUs+iv9cN53J0wlXJ0I7/yRKGjPl1d jfKCDWdj+ervffHJOXjx8MyDIMtoBOfV9bCA0eBeWDW2gZ4u/HmCSq7/abyVwvxP9V g3U05U8F3CyWPoNKxwnEqmyHMTT1B4oce/Gdc4Dpg0Q2CvbkWYmIB7SNpCFSEvUIDi r4IvO1DS+knpWyRbbVOekPFboXmkCrhfA4wAQjqmTUhsZ48jF8cIweZ1K73Z5q2R1e Q0cw5DKPgLpSaOUkFBSR2PtWe50zlQhXV3jf94FSqC/IKrpjhtukxG9obwmHYsnIs3 KYDJlGU+d3rrQ== In-Reply-To: <87k07ottlw.fsf@gnus.org> 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:238724 Archived-At: > > By the way, playing with Alan's example here a bit... To recap, this is > the test case (in a .cc file): > > --- > char long_line[] = R"foo( > > )foo" > --- > > If I insert a 1M long line there (with `C-y'), Emacs will hang > indefinitely. Wasn't the long-line stuff supposed to trigger in these > situations? Or is it hanging in some cc-mode stuff before we get that > far? > No wonder. CC Mode is a slow mode, and one of the worst offenders here. In this cas, IIUC, what you see is because CC Mode adds c-after-change to after-change-functions, which has the effect that (put-text-property 27 1000028 'face 'font-lock-string-face) is called no less than 1335 times after that C-y.