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: Tue, 26 Jan 2021 11:13:52 -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="21695"; mail-complaints-to="usenet@ciao.gmane.io" Cc: carlos@redhat.com, fweimer@redhat.com, monnier@iro.umontreal.ca, 45200@debbugs.gnu.org, Hi-Angel@yandex.ru To: Eli Zaretskii Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Tue Jan 26 17:16:06 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 1l4R0g-0005Vd-8s for geb-bug-gnu-emacs@m.gmane-mx.org; Tue, 26 Jan 2021 17:16:06 +0100 Original-Received: from localhost ([::1]:45952 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1l4R0f-0004NL-6G for geb-bug-gnu-emacs@m.gmane-mx.org; 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Tue, 26 Jan 2021 11:13:59 -0500 X-MC-Unique: fzf6eqwSPDmDufsFaOy4Mg-1 Original-Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 4FC8010054FF; Tue, 26 Jan 2021 16:13:58 +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 12F475F9A6; Tue, 26 Jan 2021 16:13:53 +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 10QGDqr6029994; Tue, 26 Jan 2021 11:13:52 -0500 In-Reply-To: <83lfcf21ny.fsf@gnu.org> (message from Eli Zaretskii on Tue, 26 Jan 2021 16:49:53 +0200) X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 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:198630 Archived-At: Eli Zaretskii writes: >> malloc_trim() is very expensive relative to free(), partly because of >> what it needs to do, and partly because it flushes the fastbins cache. > > How expensive? Can you give some quantitative measure? malloc_trim() is to free() as garbage collection is to just dropping a reference. >> If you call it every, say, 1000 iterations of free, that might suffice. >> Or perhaps after each GC run. > > There's no guarantee that a full GC will call 'free', even though > that's quite likely. malloc_trim() is our garbage collector, if you call it after GC that would be "appropriate" at least ;-)