From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by sourceware.org (Postfix) with ESMTPS id 2AF76382E45D for ; Wed, 7 Dec 2022 17:39:15 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 2AF76382E45D Authentication-Results: sourceware.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=redhat.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1670434754; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=emg+EsMA9GZUR+hjG7GoDn3PcUDQyy4i9i+j8pQwr0Y=; b=TaNWJIl45e51zCtU2mMejl6+L8FIzlZiz+WyHOW7JB65/xE9PvpvC/v6E35bvtasMKbqj5 O+ojr2iPZuOMLmdiIKc35okA4l2JTXkLVMVd9BiU7DZIHe0PSVTNq7FsyFUFyswQNxfYqp zqlYOmv8rgv1JcO8jjXXdXPBy9BRf64= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-27-Xe-uGWiKMXS1MqLf9PkVbQ-1; Wed, 07 Dec 2022 12:39:11 -0500 X-MC-Unique: Xe-uGWiKMXS1MqLf9PkVbQ-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.rdu2.redhat.com [10.11.54.6]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 4836F185A794; Wed, 7 Dec 2022 17:39:11 +0000 (UTC) Received: from oldenburg.str.redhat.com (unknown [10.2.16.63]) by smtp.corp.redhat.com (Postfix) with ESMTPS id E97212166B26; Wed, 7 Dec 2022 17:39:09 +0000 (UTC) From: Florian Weimer To: Adhemerval Zanella Netto Cc: Siddhesh Poyarekar , Zack Weinberg via Libc-alpha , Zack Weinberg , DJ Delorie Subject: Re: [RFC] Supporting malloc_usable_size References: <20221124213258.305192-1-siddhesh@gotplt.org> <87sfhyrp19.fsf@igel.home> <87o7smrnlh.fsf@igel.home> <87pmd2rnce.fsf@oldenburg.str.redhat.com> <5758633c-9989-e463-0eb6-33f483439289@owlfolio.org> <87359tpp1m.fsf@oldenburg.str.redhat.com> <874ju7ilcc.fsf@oldenburg.str.redhat.com> <5728d537-fb16-6943-5793-9291f1cabeba@gotplt.org> Date: Wed, 07 Dec 2022 18:39:06 +0100 In-Reply-To: (Adhemerval Zanella Netto's message of "Wed, 7 Dec 2022 13:54:09 -0300") Message-ID: <871qpbgll1.fsf@oldenburg.str.redhat.com> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.2 (gnu/linux) MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.6 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain X-Spam-Status: No, score=-4.5 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_NONE,TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: * Adhemerval Zanella Netto: > Another possibility would to make malloc_usable_size always return the > malloc size argument (although it would add some internal metadata > costs). We can probably implement it with little overhead, even on 32 bit, but a size-class-based allocator will require more drastic changes. Thanks, Florian