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: Mon, 01 Aug 2022 03:02:26 -0400 Message-ID: References: <837d46mjen.fsf@gnu.org> <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> 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="32832"; 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 Mon Aug 01 09:03:58 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 1oIPT3-0008Ib-Tq for geb-bug-gnu-emacs@m.gmane-mx.org; Mon, 01 Aug 2022 09:03:58 +0200 Original-Received: from localhost ([::1]:60748 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1oIPT1-0008Ap-7J for geb-bug-gnu-emacs@m.gmane-mx.org; Mon, 01 Aug 2022 03:03:56 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:43426) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oIPSA-0008Ae-8Z for bug-gnu-emacs@gnu.org; Mon, 01 Aug 2022 03:03:03 -0400 Original-Received: from debbugs.gnu.org ([209.51.188.43]:49376) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1oIPS9-0004ti-VM for bug-gnu-emacs@gnu.org; Mon, 01 Aug 2022 03:03:01 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1oIPS9-0005wK-Qn for bug-gnu-emacs@gnu.org; Mon, 01 Aug 2022 03:03:01 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Stefan Monnier Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Mon, 01 Aug 2022 07:03:01 +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=B56682.165933736222803 (code B ref 56682); Mon, 01 Aug 2022 07:03:01 +0000 Original-Received: (at 56682) by debbugs.gnu.org; 1 Aug 2022 07:02:42 +0000 Original-Received: from localhost ([127.0.0.1]:39125 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1oIPRp-0005vj-Qf for submit@debbugs.gnu.org; Mon, 01 Aug 2022 03:02:42 -0400 Original-Received: from mailscanner.iro.umontreal.ca ([132.204.25.50]:19472) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1oIPRl-0005vU-8I for 56682@debbugs.gnu.org; Mon, 01 Aug 2022 03:02:40 -0400 Original-Received: from pmg1.iro.umontreal.ca (localhost.localdomain [127.0.0.1]) by pmg1.iro.umontreal.ca (Proxmox) with ESMTP id 857E2100502; Mon, 1 Aug 2022 03:02:31 -0400 (EDT) Original-Received: from mail01.iro.umontreal.ca (unknown [172.31.2.1]) by pmg1.iro.umontreal.ca (Proxmox) with ESMTP id 492B810012E; Mon, 1 Aug 2022 03:02:30 -0400 (EDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=iro.umontreal.ca; s=mail; t=1659337350; bh=Gnzn8nHtu1IprvLimWskqAn76rHIA6LajhaoVenCHsc=; h=From:To:Cc:Subject:In-Reply-To:References:Date:From; b=XRPZ0DxAQZSuJy3veTg8AnAuZnA3AUrPzjUGfnVOBIWgcm0C0QVEYSRVxgQNLauNd 8RcyhwRr16YN2kxODJAgV5eYPm3OD8KNScIH6VqRap0HDo5Zln1F3K8VWeFpc9HPGg xJ3mnQ6rPZoemBdDdPtCio5MO5T1Wz+qnsHMAvOsAYfZFTibbzOeUZ8mxaofEkCFUk VhFp93HPLjcIUsOuwdHWIHPFbesjyKICzx7EilvQCZTRYZevqlw1X132y5uFKW5ygY jlf9LeFZQPMwbQrk2OMpuYvIPJM4A8rjSq+gcxVOiIj4H69YPfut0CnMKp7quC8Vu6 Dfbff9hrYRwuA== Original-Received: from milanesa (dyn.144-85-174-155.dsl.vtx.ch [144.85.174.155]) by mail01.iro.umontreal.ca (Postfix) with ESMTPSA id 430B11201E3; Mon, 1 Aug 2022 03:02:29 -0400 (EDT) In-Reply-To: <8c7321f2f3ec1ef81af9@heytings.org> (Gregory Heytings's message of "Sun, 31 Jul 2022 23:15:56 +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:238388 Archived-At: >>> That's true, but with such big files, the initial scan is slow. So the >>> scenario is simple: you open a big enough file, type M->, and C-p. M-> >>> will be instantaneous, and C-p will take a while, because of syntax-ppss. >> Really? I'd expect that `M->` is slow because of `syntax-ppss` (called by >> font-lock) and then `C-p` is instantaneous. > Yes, really. M-> is fast because syntax-ppss is called inside > fontification-functions, which are evaluated in a small portion of the > buffer (with locked narrowing). Ah, you're talking about a file with a long line. I was thinking of just a normal large file. > And C-p is slow because post-command-hook is (or rather was) not > subjected to the same locked narrowing. I wonder what `C-p` has to do with `post-command-hook`. After all, that same `post-command-hook` is also run after `M->` as well. Stefan