From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: DJ Delorie Newsgroups: gmane.emacs.bugs Subject: bug#45200: [PATCH] Force Glibc to free the memory freed Date: Wed, 03 Feb 2021 14:30:56 -0500 Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="28562"; mail-complaints-to="usenet@ciao.gmane.io" Cc: carlos@redhat.com, fweimer@redhat.com, 45200@debbugs.gnu.org, hi-angel@yandex.ru To: Stefan Monnier Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Wed Feb 03 20:58:10 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 1l7OHy-0007K4-Pr for geb-bug-gnu-emacs@m.gmane-mx.org; Wed, 03 Feb 2021 20:58:10 +0100 Original-Received: from localhost ([::1]:35590 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1l7OHx-0000rF-RD for geb-bug-gnu-emacs@m.gmane-mx.org; 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Wed, 03 Feb 2021 14:31:03 -0500 X-MC-Unique: aSbwW-leOTu3tv4O_nZ12A-1 Original-Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 793EBBBF0F; Wed, 3 Feb 2021 19:31:02 +0000 (UTC) Original-Received: from greed.delorie.com (ovpn-114-77.rdu2.redhat.com [10.10.114.77]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 2BC11100AE4B; Wed, 3 Feb 2021 19:30:58 +0000 (UTC) Original-Received: from greed.delorie.com.redhat.com (localhost [127.0.0.1]) by greed.delorie.com (8.14.7/8.14.7) with ESMTP id 113JUuTM000841; Wed, 3 Feb 2021 14:30:57 -0500 In-Reply-To: (message from Stefan Monnier on Wed, 03 Feb 2021 11:51:55 -0500) X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=dj@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com 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:199233 Archived-At: Stefan Monnier writes: > I'm not sure I follow: if I were to implement a malloc library, calls to > `free` would be exactly the place where I'd decide that some memory > should be returned to the OS, Heh. malloc() and free() are on the hot path for many time-critical things; if you wasted time in free() when you didn't have to, people would complain. *This* is the tradeoff we (glibc devs) have to make - performance vs footprint. Gaining even a few percent in a malloc/free benchmark is a *huge* win for some folks.