From mboxrd@z Thu Jan  1 00:00:00 1970
Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail
From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.help
Subject: Re: How to debug memory leaks
Date: Fri, 26 Mar 2021 18:33:20 +0300
Message-ID: <83k0puorpb.fsf@gnu.org>
References: <af114c1d2980e242ce4b93f785b16284@cryptolab.net>
 <87pmzmihyj.fsf@robertthorpeconsulting.com>
 <jwv4kgy6m9a.fsf-monnier+emacs@gnu.org>
 <AM9PR09MB4977FC31BB67956A800B0C7296619@AM9PR09MB4977.eurprd09.prod.outlook.com>
 <83lfaaot5h.fsf@gnu.org> 
 <AM9PR09MB497742F6D988D3EB6DF8E3E596619@AM9PR09MB4977.eurprd09.prod.outlook.com>
Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214";
	logging-data="40119"; mail-complaints-to="usenet@ciao.gmane.io"
To: help-gnu-emacs@gnu.org
Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Fri Mar 26 16:34:04 2021
Return-path: <help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org>
Envelope-to: geh-help-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 <help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org>)
	id 1lPoTL-000AIL-Sx
	for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 26 Mar 2021 16:34:03 +0100
Original-Received: from localhost ([::1]:57834 helo=lists1p.gnu.org)
	by lists.gnu.org with esmtp (Exim 4.90_1)
	(envelope-from <help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org>)
	id 1lPoTK-0004Bg-Us
	for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 26 Mar 2021 11:34:02 -0400
Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:44994)
 by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)
 (Exim 4.90_1) (envelope-from <eliz@gnu.org>) id 1lPoSd-0004AJ-F4
 for help-gnu-emacs@gnu.org; Fri, 26 Mar 2021 11:33:19 -0400
Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:36526)
 by eggs.gnu.org with esmtp (Exim 4.90_1)
 (envelope-from <eliz@gnu.org>) id 1lPoSd-0000K3-7A
 for help-gnu-emacs@gnu.org; Fri, 26 Mar 2021 11:33:19 -0400
Original-Received: from 84.94.185.95.cable.012.net.il ([84.94.185.95]:1405
 helo=home-c4e4a596f7)
 by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256)
 (Exim 4.82) (envelope-from <eliz@gnu.org>) id 1lPoSc-00050p-IB
 for help-gnu-emacs@gnu.org; Fri, 26 Mar 2021 11:33:19 -0400
In-Reply-To: <AM9PR09MB497742F6D988D3EB6DF8E3E596619@AM9PR09MB4977.eurprd09.prod.outlook.com>
 (message from Arthur Miller on Fri, 26 Mar 2021 16:09:33 +0100)
X-BeenThere: help-gnu-emacs@gnu.org
X-Mailman-Version: 2.1.23
Precedence: list
List-Id: Users list for the GNU Emacs text editor <help-gnu-emacs.gnu.org>
List-Unsubscribe: <https://lists.gnu.org/mailman/options/help-gnu-emacs>,
 <mailto:help-gnu-emacs-request@gnu.org?subject=unsubscribe>
List-Archive: <https://lists.gnu.org/archive/html/help-gnu-emacs>
List-Post: <mailto:help-gnu-emacs@gnu.org>
List-Help: <mailto:help-gnu-emacs-request@gnu.org?subject=help>
List-Subscribe: <https://lists.gnu.org/mailman/listinfo/help-gnu-emacs>,
 <mailto:help-gnu-emacs-request@gnu.org?subject=subscribe>
Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org
Original-Sender: "help-gnu-emacs"
 <help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org>
Xref: news.gmane.io gmane.emacs.help:128643
Archived-At: <http://permalink.gmane.org/gmane.emacs.help/128643>

> From: Arthur Miller <arthur.miller@live.com>
> Cc: help-gnu-emacs@gnu.org
> Date: Fri, 26 Mar 2021 16:09:33 +0100
> 
> > That's what GC does.
> Yes, but GC can't know if I don't need undo history, right

And neither do you.  GC compacts the undo history, though, and frees
the slack.

> or old text in eshell buffer?

Delete it, and it will be free'd.

> Can we maybe get a "cleanup-hook" so we can specify per mode which
> data/variables shoudl be set to nil so GC can do it's job?

It's much easier to delete unneeded stuff, and let GC recycle the
memory.