From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Wolfgang Jenkner Newsgroups: gmane.emacs.bugs Subject: bug#19393: 25.0.50; Emacs cannot determine coding system of ISO-8859 encoded files Date: Sat, 20 Dec 2014 04:21:54 +0100 Message-ID: <85vbl7qa3x.fsf@iznogoud.viz> References: <87sigfpqmx.fsf@thinkpad-t440p.tsdh.org> <85oar3xwc1.fsf@iznogoud.viz> <871tnzs7y6.fsf@thinkpad-t440p.tsdh.org> <85mw6m4aqs.fsf@iznogoud.viz> <83zjamuvgf.fsf@gnu.org> <85egry464g.fsf@iznogoud.viz> <83y4q6us1v.fsf@gnu.org> <85bnn1pvr1.fsf@iznogoud.viz> <83388dudvt.fsf@gnu.org> <85vbl8nce4.fsf@iznogoud.viz> <83tx0suajy.fsf@gnu.org> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: ger.gmane.org 1419045809 19280 80.91.229.3 (20 Dec 2014 03:23:29 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sat, 20 Dec 2014 03:23:29 +0000 (UTC) Cc: 19393@debbugs.gnu.org To: Eli Zaretskii Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Sat Dec 20 04:23:22 2014 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 1Y2AdW-0001ME-5V for geb-bug-gnu-emacs@m.gmane.org; Sat, 20 Dec 2014 04:23:22 +0100 Original-Received: from localhost ([::1]:33159 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Y2AdU-0004Gb-S4 for geb-bug-gnu-emacs@m.gmane.org; Fri, 19 Dec 2014 22:23:20 -0500 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:32905) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Y2AdK-0004GT-FR for bug-gnu-emacs@gnu.org; Fri, 19 Dec 2014 22:23:17 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Y2AdC-0004E9-VV for bug-gnu-emacs@gnu.org; Fri, 19 Dec 2014 22:23:10 -0500 Original-Received: from debbugs.gnu.org ([140.186.70.43]:42700) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Y2AdC-0004E5-S7 for bug-gnu-emacs@gnu.org; Fri, 19 Dec 2014 22:23:02 -0500 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.80) (envelope-from ) id 1Y2AdC-0006BZ-F2 for bug-gnu-emacs@gnu.org; Fri, 19 Dec 2014 22:23:02 -0500 X-Loop: help-debbugs@gnu.org Resent-From: Wolfgang Jenkner Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Sat, 20 Dec 2014 03:23:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 19393 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: Original-Received: via spool by 19393-submit@debbugs.gnu.org id=B19393.141904572223695 (code B ref 19393); Sat, 20 Dec 2014 03:23:02 +0000 Original-Received: (at 19393) by debbugs.gnu.org; 20 Dec 2014 03:22:02 +0000 Original-Received: from localhost ([127.0.0.1]:52066 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1Y2AcD-0006A7-UA for submit@debbugs.gnu.org; Fri, 19 Dec 2014 22:22:02 -0500 Original-Received: from b2bfep15.mx.upcmail.net ([62.179.121.60]:45864) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1Y2AcA-00069e-26 for 19393@debbugs.gnu.org; Fri, 19 Dec 2014 22:21:59 -0500 Original-Received: from edge12.upcmail.net ([192.168.13.82]) by b2bfep15.mx.upcmail.net (InterMail vM.8.01.05.05 201-2260-151-110-20120111) with ESMTP id <20141220032155.FZLJ21184.b2bfep15-int.chello.at@edge12.upcmail.net> for <19393@debbugs.gnu.org>; Sat, 20 Dec 2014 04:21:55 +0100 Original-Received: from iznogoud.viz ([85.127.11.157]) by edge12.upcmail.net with edge id VfMv1p00H3PJ2L50CfMvEN; Sat, 20 Dec 2014 04:21:55 +0100 X-SourceIP: 85.127.11.157 Original-Received: from wolfgang by iznogoud.viz with local (Exim 4.84 (FreeBSD)) (envelope-from ) id 1Y2Ac6-00011b-Ue; Sat, 20 Dec 2014 04:21:54 +0100 In-Reply-To: <83tx0suajy.fsf@gnu.org> (Eli Zaretskii's message of "Thu, 18 Dec 2014 19:34:09 +0200") User-Agent: Gnus/5.130012 (Ma Gnus v0.12) Emacs/25.0.50 (berkeley-unix) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.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:97590 Archived-At: On Thu, Dec 18 2014, Eli Zaretskii wrote: > Then it's probably some inefficiency in insert-file-contents, when it > is called to revert a buffer. If you have time, please take a look > what happens there, I suspect we reallocate the buffer in very small > chunks, instead of doing it with larger increments. (With compressed > files, it's hard to do, because the size of the uncompressed file is > not known in advance.) I have been looking into this with dtrace and what is sure is that a large amount of data (increasing up to the order of magnitude of the buffer size) is memcpy'd again and again as a result of mmap_realloc being called by enlarge_buffer_text. Apparently, the latter is called for buffer gap handling which is triggered by decode_coding_c_string (or rather decode_coding_object) in insert-file-contents. So it seems that the effect on memory of this innocent-looking loop there is enormously magnified. But I have to look at the source more closely (not that I expect to get any idea how to fix this, though).