From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.bugs Subject: bug#56682: Fix the long lines font locking related slowdowns Date: Wed, 03 Aug 2022 15:08:42 +0300 Message-ID: <83h72t5y2d.fsf@gnu.org> References: <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> <74ddc877f1b74ab56d18@heytings.org> <83r11y5a9d.fsf@gnu.org> Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="36396"; mail-complaints-to="usenet@ciao.gmane.io" Cc: 56682@debbugs.gnu.org, gregory@heytings.org, dgutov@yandex.ru To: Stefan Monnier Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Wed Aug 03 14:10:48 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 1oJDD5-0009Hk-Jq for geb-bug-gnu-emacs@m.gmane-mx.org; Wed, 03 Aug 2022 14:10:47 +0200 Original-Received: from localhost ([::1]:38810 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1oJDD3-0003iz-Po for geb-bug-gnu-emacs@m.gmane-mx.org; Wed, 03 Aug 2022 08:10:45 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:59418) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oJDCP-0003dt-N5 for bug-gnu-emacs@gnu.org; Wed, 03 Aug 2022 08:10:05 -0400 Original-Received: from debbugs.gnu.org ([209.51.188.43]:56789) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1oJDCM-0003tQ-AQ for bug-gnu-emacs@gnu.org; Wed, 03 Aug 2022 08:10:05 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1oJDCM-0003JF-5i for bug-gnu-emacs@gnu.org; Wed, 03 Aug 2022 08:10:02 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Eli Zaretskii Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Wed, 03 Aug 2022 12:10:02 +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=B56682.165952855112657 (code B ref 56682); Wed, 03 Aug 2022 12:10:02 +0000 Original-Received: (at 56682) by debbugs.gnu.org; 3 Aug 2022 12:09:11 +0000 Original-Received: from localhost ([127.0.0.1]:46538 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1oJDBW-0003I5-OP for submit@debbugs.gnu.org; Wed, 03 Aug 2022 08:09:11 -0400 Original-Received: from eggs.gnu.org ([209.51.188.92]:46170) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1oJDBG-0003HL-RY for 56682@debbugs.gnu.org; Wed, 03 Aug 2022 08:09:09 -0400 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:41338) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oJDBB-0003dX-14; Wed, 03 Aug 2022 08:08:49 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=gnu.org; s=fencepost-gnu-org; h=References:Subject:In-Reply-To:To:From:Date: mime-version; bh=ZsfvG7tpARQnP8SS4sDdrb6VVlPDFSuy+SsFKiTaHyM=; b=j0HRk6nCKJa/ liJplTlvnUqR2ojXD4sICcPI9knzaSDVYz8E6Qj95zS57dZOQb+G3qrdruv/N/ssrGeuGioT14b2O YmAKTEymFvpJnjZx6EdZumUxQUZ1boLUT0r9RXeVnPhe4VKtk/a1hLGFHAUPhuK8H4Kdv9BNZXkzr xEYBzcV828RF09dPe6bHifVvteyCxFCUEUrn0kqL5YiiYOCF4qPXC/McPZ6Uk6R3Om8x8Vrx9ek1m 9aTtvYWNHA7UQZl7fiOIYBVNgNT6ki//VWIEATiAV2D6HFK1LcWxg0vVJs1rrdVx6HiZrhzsCOfU+ 8UKwVUrP+MnOlt+JOEdx/Q==; Original-Received: from [87.69.77.57] (port=4224 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oJDBA-0000vB-FY; Wed, 03 Aug 2022 08:08:48 -0400 In-Reply-To: (message from Stefan Monnier on Wed, 03 Aug 2022 04:37:55 -0400) 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:238636 Archived-At: > From: Stefan Monnier > Cc: gregory@heytings.org, dgutov@yandex.ru, 56682@debbugs.gnu.org > Date: Wed, 03 Aug 2022 04:37:55 -0400 > > >> > 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. > >> > >> By tying this to "long lines" is wrong, since it has nothing to do with > >> long lines, only with large buffers. > > > > I thought you told me once that syntax-propertize needs to consider > > complete lines in some (frequent) situations? > > Yes, but we're talking about `syntax-ppss` here. Admittedly, > `syntax-ppss` uses `syntax-propertize` internally, but I think the two > need to be considered separately (and `syntax-propertize` already tries > to bound its work via `syntax-wholeline-max`). What about parse-partial-sexp, which calls scan_sexps_forward? It looks like I've misremembered, and that was the culprit in the scenario we discussed, see https://debbugs.gnu.org/cgi/bugreport.cgi?bug=45898#92.