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: Sun, 31 Jul 2022 10:50:18 +0000 Message-ID: <8c7321f2f388e5343475@heytings.org> References: <837d46mjen.fsf@gnu.org> <8a3eaeef01be5bfaa5ef@heytings.org> <05388e8d8812bfa3695d@heytings.org> <83v8rf5894.fsf@gnu.org> <65cb7c73fd4a999cca00@heytings.org> <8c7321f2f3400a5db9be@heytings.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="19072"; mail-complaints-to="usenet@ciao.gmane.io" Cc: 56682@debbugs.gnu.org, Eli Zaretskii To: Stefan Monnier Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Sun Jul 31 12:53:28 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 1oI6Za-0004ob-5E for geb-bug-gnu-emacs@m.gmane-mx.org; Sun, 31 Jul 2022 12:53:26 +0200 Original-Received: from localhost ([::1]:55314 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1oI6ZZ-0004Ca-1S for geb-bug-gnu-emacs@m.gmane-mx.org; Sun, 31 Jul 2022 06:53:25 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:51646) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oI6XG-000354-OE for bug-gnu-emacs@gnu.org; Sun, 31 Jul 2022 06:51:02 -0400 Original-Received: from debbugs.gnu.org ([209.51.188.43]:46745) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1oI6XG-0001qQ-Dx for bug-gnu-emacs@gnu.org; Sun, 31 Jul 2022 06:51:02 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1oI6XG-0001k3-9d for bug-gnu-emacs@gnu.org; Sun, 31 Jul 2022 06:51:02 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Gregory Heytings Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Sun, 31 Jul 2022 10:51:02 +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=B56682.16592646376649 (code B ref 56682); Sun, 31 Jul 2022 10:51:02 +0000 Original-Received: (at 56682) by debbugs.gnu.org; 31 Jul 2022 10:50:37 +0000 Original-Received: from localhost ([127.0.0.1]:36489 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1oI6Wq-0001jA-T6 for submit@debbugs.gnu.org; Sun, 31 Jul 2022 06:50:37 -0400 Original-Received: from heytings.org ([95.142.160.155]:60382) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1oI6Wa-0001ia-8T for 56682@debbugs.gnu.org; Sun, 31 Jul 2022 06:50:35 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=heytings.org; s=20220101; t=1659264619; bh=7/Rdd6o7//iGC8NGG55oG9zNQ/y5CocUic+Un4ZE7L8=; h=Date:From:To:cc:Subject:In-Reply-To:Message-ID:References:From; b=WHqKtNMMTn3jS8q8e1S+cULowpWIqd2YCEyqb+AjlIw6Tq+2ksaW1pgls8vpsXcv+ dD1zMuS/mIv4tGe1qmHadR+uSO44UwBFG5ba5lOmvN4hOKUNUkNL9e15BOUoLaHTJA ZFtW/X0CArAuKCw1re+a1GIi8fba8DUy8xvtXV7xaESwqBbfJ6bUEttg3zbYC9nZSi otxE5bgQEm2TUvH+kKwplnaY3TJgFIXw3tLctiXGcUR68BOzZi+F7fmEIONTJVYdBn VnlvR2jvt4jvvXVUWlKzKpZd7yMb3i1MHPw3r/RWaXEvsLf+FiDFKXGi+bGH3sQdSD ofBVR/Bmm1CkQ== 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:238337 Archived-At: > > Emacs is not in the business of preventing people from shooting > themselves in the foot. If we need this narrowing to be enforced > because Emacs would otherwise crash, then it's OK, but if not, then we > *should* provide a way to undo it. > And how do you define "crash"? Is Emacs becoming unresponsive because an operation takes say two minutes to complete and cannot be interrupted a "crash"? Or is a "crash" only a segfault? >> BTW, my tests show that syntax-ppss can be rather slow, when the file >> is large enough (say 1 GB). > > No doubt. But it's no slower with long lines than with short lines. > Yes, I wasn't clear enough, I should have written "when the file is large enough (say 1 GB), even without long lines". But you didn't answer my question: is it not possible to design a version of syntax-ppss that would approximate, with some heuristics, what syntax-ppss does, but on a smaller chunk of the buffer? With such a syntax-ppss-approximate function, we could do something like (defun syntax-ppss (args) (if (narrow-to-region-locked) (syntax-ppss-approximage args) (syntax-ppss-accurate args)))