From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Mark H Weaver Newsgroups: gmane.emacs.bugs Subject: bug#46978: 27.1; Shell mode performs extremely poorly in Linux-libre 5.10.20 Date: Sat, 06 Mar 2021 21:39:54 -0500 Message-ID: <87ft17it4a.fsf@netris.org> References: <878s6z25y4.fsf@netris.org> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="23417"; mail-complaints-to="usenet@ciao.gmane.io" To: 46978@debbugs.gnu.org Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Sun Mar 07 03:42:10 2021 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 1lIjMw-0005yB-N8 for geb-bug-gnu-emacs@m.gmane-mx.org; Sun, 07 Mar 2021 03:42:10 +0100 Original-Received: from localhost ([::1]:48414 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lIjMv-0000FL-Pc for geb-bug-gnu-emacs@m.gmane-mx.org; Sat, 06 Mar 2021 21:42:09 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:34176) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lIjMo-0000Ey-Rf for bug-gnu-emacs@gnu.org; Sat, 06 Mar 2021 21:42:02 -0500 Original-Received: from debbugs.gnu.org ([209.51.188.43]:55355) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1lIjMo-0004Im-KV for bug-gnu-emacs@gnu.org; Sat, 06 Mar 2021 21:42:02 -0500 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1lIjMo-0004LF-HR for bug-gnu-emacs@gnu.org; Sat, 06 Mar 2021 21:42:02 -0500 X-Loop: help-debbugs@gnu.org Resent-From: Mark H Weaver Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Sun, 07 Mar 2021 02:42:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 46978 X-GNU-PR-Package: emacs Original-Received: via spool by 46978-submit@debbugs.gnu.org id=B46978.161508488716636 (code B ref 46978); Sun, 07 Mar 2021 02:42:02 +0000 Original-Received: (at 46978) by debbugs.gnu.org; 7 Mar 2021 02:41:27 +0000 Original-Received: from localhost ([127.0.0.1]:38668 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1lIjMF-0004KF-3L for submit@debbugs.gnu.org; Sat, 06 Mar 2021 21:41:27 -0500 Original-Received: from world.peace.net ([64.112.178.59]:53540) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1lIjMD-0004K2-LQ for 46978@debbugs.gnu.org; Sat, 06 Mar 2021 21:41:26 -0500 Original-Received: from mhw by world.peace.net with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1lIjM7-00073K-Eg; Sat, 06 Mar 2021 21:41:19 -0500 In-Reply-To: <878s6z25y4.fsf@netris.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:201708 Archived-At: Mark H Weaver writes: > I've skimmed the list of changes between Linux 5.10.19 and 5.10.20, and > found these two commits that might be relevant: > > tty: implement read_iter > > > tty: convert tty_ldisc_ops 'read()' function to take a kernel pointer > > > These changes are also included in Linux-libre 5.11.3 (the newest > release), but I haven't yet tried that version. > > I'm currently building a variant of Linux-libre 5.10.20 with these two > commits reverted, to see if that makes the problem go away, and I will > report back when I have those results. Reverting the two commits cited above fixes the problem. Mark