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: Tue, 02 Aug 2022 15:09:08 +0000 Message-ID: <74ddc877f1b74ab56d18@heytings.org> References: <8a3eaeef01be5bfaa5ef@heytings.org> <05388e8d8812bfa3695d@heytings.org> <83v8rf5894.fsf@gnu.org> <65cb7c73fd4a999cca00@heytings.org> <8c7321f2f3400a5db9be@heytings.org> <8c7321f2f388e5343475@heytings.org> <6ea376f6-d503-06d8-6d83-50c52b695394@yandex.ru> <8c7321f2f3ac52bfee4b@heytings.org> <8c7321f2f3ec1ef81af9@heytings.org> <02e83b0e-1b5c-fe75-6e59-1f8ddff82d37@yandex.ru> <96f28fd8-6744-1925-0631-0095099362dd@yandex.ru> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="6338"; mail-complaints-to="usenet@ciao.gmane.io" Cc: 56682@debbugs.gnu.org, Eli Zaretskii , Stefan Monnier To: Dmitry Gutov Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Tue Aug 02 17:10:31 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 1oItXR-0001Q9-P8 for geb-bug-gnu-emacs@m.gmane-mx.org; Tue, 02 Aug 2022 17:10:29 +0200 Original-Received: from localhost ([::1]:57366 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1oItXQ-0002rv-6u for geb-bug-gnu-emacs@m.gmane-mx.org; Tue, 02 Aug 2022 11:10:28 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:39152) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oItX2-0002oG-55 for bug-gnu-emacs@gnu.org; Tue, 02 Aug 2022 11:10:04 -0400 Original-Received: from debbugs.gnu.org ([209.51.188.43]:55020) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1oItWz-0004CO-SD for bug-gnu-emacs@gnu.org; Tue, 02 Aug 2022 11:10:03 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1oItWz-0000p9-Nv for bug-gnu-emacs@gnu.org; Tue, 02 Aug 2022 11:10:01 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Gregory Heytings Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Tue, 02 Aug 2022 15:10:01 +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=B56682.16594529513097 (code B ref 56682); Tue, 02 Aug 2022 15:10:01 +0000 Original-Received: (at 56682) by debbugs.gnu.org; 2 Aug 2022 15:09:11 +0000 Original-Received: from localhost ([127.0.0.1]:44768 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1oItWB-0000ns-0x for submit@debbugs.gnu.org; Tue, 02 Aug 2022 11:09:11 -0400 Original-Received: from heytings.org ([95.142.160.155]:35686) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1oItW9-0000nl-Pr for 56682@debbugs.gnu.org; Tue, 02 Aug 2022 11:09:10 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=heytings.org; s=20220101; t=1659452949; bh=Aw5YMEZEZLS3RhvwTniIRyaXJkxL7YUiqfRqcWLoAtQ=; h=Date:From:To:cc:Subject:In-Reply-To:Message-ID:References:From; b=09SFuykUI8vH1Stc7imGALPrgHa2+YQbHasAAO9I3clGx3NFUy2yLnA7jitBSvzmM vrkyJFDf3gh5E/A+rtBFN24VZVvzVu6t4yu83lcH9LIaGZuhdm9PSgZNdr3VBn0PBM Q9VC1tWGY0rc6b7ugglXBamBRTEnRLb8xtYQRL4T1opq7MDxSqeJPyV8jRvwU01c1L HgyPtTz4cJp/cteOUAeRml/D1clSaE5NpyjQ/nVp3Dj/fbdZ3XBQg9x9GGKGSs3fhI Emr5KzrO9ZcxnnXv7wyIwMwlVk2PcNbvJL5QQiFhZHfHCkMUcHwmAbsKyBVcXhofvI txw1yREGjzP6g== In-Reply-To: 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:238564 Archived-At: >> It is necessary to add a locked narrowing around >> fontification-functions and pre/post-command-hook to ensure that Emacs >> remains responsive. > > Perhaps tweaking the value of syntax-wholeline-max could have a similar > enough effect? > It doesn't, alas. >> Unless I misunderstand something, I think (and my tests seem to >> confirm) that that would be a workable solution, provided that the >> initial scan is reasonably fast, that is, at least six times faster >> than it is now. > > I'm afraid this approach is too blunt to be a solution. > Indeed, that's my conclusion too. So until syntax-ppss (at least) is made an order of magnitude faster, the right thing to do is to use the forced narrowing method.