From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: martin rudalics Newsgroups: gmane.emacs.bugs Subject: bug#12867: 24.3.50; easy-to-repro crash involving mode line Date: Mon, 12 Nov 2012 18:31:53 +0100 Message-ID: <50A13289.4050301@gmx.at> References: <77CAAFE4D0CE4DD98476C996E3158648@us.oracle.com> <83obj2x218.fsf@gnu.org> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: 7bit X-Trace: ger.gmane.org 1352741806 14296 80.91.229.3 (12 Nov 2012 17:36:46 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Mon, 12 Nov 2012 17:36:46 +0000 (UTC) Cc: 12867@debbugs.gnu.org To: Eli Zaretskii Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Mon Nov 12 18:36:56 2012 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1TXxwM-00026o-QE for geb-bug-gnu-emacs@m.gmane.org; Mon, 12 Nov 2012 18:36:54 +0100 Original-Received: from localhost ([::1]:39900 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TXxwD-0005XP-52 for geb-bug-gnu-emacs@m.gmane.org; Mon, 12 Nov 2012 12:36:45 -0500 Original-Received: from eggs.gnu.org ([208.118.235.92]:40762) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TXxw8-0005WA-3d for bug-gnu-emacs@gnu.org; Mon, 12 Nov 2012 12:36:43 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1TXxw5-0004Ct-1L for bug-gnu-emacs@gnu.org; Mon, 12 Nov 2012 12:36:40 -0500 Original-Received: from debbugs.gnu.org ([140.186.70.43]:53811) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TXxw4-0004Cn-UB for bug-gnu-emacs@gnu.org; Mon, 12 Nov 2012 12:36:36 -0500 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.72) (envelope-from ) id 1TXxwT-0006wI-La for bug-gnu-emacs@gnu.org; Mon, 12 Nov 2012 12:37:01 -0500 X-Loop: help-debbugs@gnu.org Resent-From: martin rudalics Original-Sender: debbugs-submit-bounces@debbugs.gnu.org Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Mon, 12 Nov 2012 17:37:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 12867 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: Original-Received: via spool by 12867-submit@debbugs.gnu.org id=B12867.135274182126667 (code B ref 12867); Mon, 12 Nov 2012 17:37:01 +0000 Original-Received: (at 12867) by debbugs.gnu.org; 12 Nov 2012 17:37:01 +0000 Original-Received: from localhost ([127.0.0.1]:35829 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.72) (envelope-from ) id 1TXxwS-0006w4-NC for submit@debbugs.gnu.org; Mon, 12 Nov 2012 12:37:00 -0500 Original-Received: from mailout-de.gmx.net ([213.165.64.22]:59240) by debbugs.gnu.org with smtp (Exim 4.72) (envelope-from ) id 1TXxwQ-0006vx-Ko for 12867@debbugs.gnu.org; Mon, 12 Nov 2012 12:36:59 -0500 Original-Received: (qmail invoked by alias); 12 Nov 2012 17:32:05 -0000 Original-Received: from 62-47-52-212.adsl.highway.telekom.at (EHLO [62.47.52.212]) [62.47.52.212] by mail.gmx.net (mp010) with SMTP; 12 Nov 2012 18:32:05 +0100 X-Authenticated: #14592706 X-Provags-ID: V01U2FsdGVkX1/jxKpkOFfjPD0kF3eiSm6rN55ruRYWlx4o/u0th5 e/M08e7f0LQC// In-Reply-To: <83obj2x218.fsf@gnu.org> X-Y-GMX-Trusted: 0 X-Spam-Score: 0.8 (/) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.13 Precedence: list X-Spam-Score: 0.8 (/) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6.x X-Received-From: 140.186.70.43 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.org@gnu.org Original-Sender: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.bugs:66806 Archived-At: > The need to redisplay the mode line on every move of point is a killer > of many redisplay optimizations. It is also potentially expensive by > itself, because it requires Emacs to count lines, something that is > not an easy operation in Emacs, which sees the buffer text as a linear > array of characters, not a series of lines. So the display engine > tries very hard to avoid redisplaying the mode line if it decides that > the line number does not need to appear. I think it would make sense to use a cache for maintaining line numbers. martin