From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from EUR06-VI1-obe.outbound.protection.outlook.com (mail-vi1eur06olkn2107.outbound.protection.outlook.com [40.92.17.107]) by sourceware.org (Postfix) with ESMTPS id 6F60E3857812 for ; Mon, 9 Nov 2020 14:09:02 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org 6F60E3857812 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=Iy1HEmwaZu6Bu1oG4Xm+6xnxeVp7meG4zDp5mpKctFJIr4iccsnjOTTf3J8HDiKIW63snX4wBO/vZ79m21nqXyYmJQkLbvpbqOG84Q035RFwTp1P/tbKxqXNSY9/MhkSk1bV2ihlOTa7PNBJ+sFsliql1XEIfHneTaIB4fsptEgP8Gd9u4RTtTWbKrXXO1vXMS+kToNcLkl9P6970YZ9hZSuB3YADqVxDoxxfmj5uICFVoqFyoi8jn1rt/F9VsUPsupacILzO03KgaWzCe8w2y/soW1SbGd9Q5D6F+h0egn/8LK+RJ0Y12gKJUB+Vsxk903YtJfDJqf4Bz2cqWzOpw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=rfoic3KeDU2VZVrG3CJG7l+VNIWTvbXWGqsFR8k/4mU=; 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Mon, 9 Nov 2020 14:09:00 +0000 X-IncomingTopHeaderMarker: OriginalChecksum:D6011C4B10BDCEEA5255C62780D7C354DE1988A348377695F83F6BAF9CC4B7D1; UpperCasedChecksum:52A119114E8A12E397B8177324A0619FDA12CEA5FC413C816DD913D9E2C3D093; SizeAsReceived:8651; Count:47 Received: from DB8PR10MB2905.EURPRD10.PROD.OUTLOOK.COM ([fe80::1557:46a6:ce1a:43c]) by DB8PR10MB2905.EURPRD10.PROD.OUTLOOK.COM ([fe80::1557:46a6:ce1a:43c%6]) with mapi id 15.20.3541.025; Mon, 9 Nov 2020 14:09:00 +0000 Subject: Re: Implementing a heap watermark To: newlib@sourceware.org References: From: Federico Terraneo Message-ID: Date: Mon, 9 Nov 2020 15:08:53 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit X-TMN: [mZaMwxdv8v5L6UCGlQpyOBsfow1b6kEv] X-ClientProxiedBy: ZRAP278CA0001.CHEP278.PROD.OUTLOOK.COM (2603:10a6:910:10::11) To DB8PR10MB2905.EURPRD10.PROD.OUTLOOK.COM (2603:10a6:10:e9::18) X-Microsoft-Original-Message-ID: <10f978ad-64cf-9b5c-a139-518d2a69ddc9@hotmail.it> MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from [192.168.1.100] (151.48.226.141) by ZRAP278CA0001.CHEP278.PROD.OUTLOOK.COM (2603:10a6:910:10::11) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3541.21 via Frontend Transport; Mon, 9 Nov 2020 14:09:00 +0000 X-MS-PublicTrafficType: Email X-IncomingHeaderCount: 47 X-EOPAttributedMessage: 0 X-MS-Office365-Filtering-Correlation-Id: 54934b61-836a-4c9a-6397-08d884b901a5 X-MS-TrafficTypeDiagnostic: AM7EUR06HT249: X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: FhH2/1Bp9d4dyYU2rQkljilY9q3HLuENZEmgoFvesLRiFiDBSmDH+vest63RtH0a976Jq3HlZ9KlUGmXtFvcs01yiPfX8/Dgt7ygRYI0yLheUzDCHhP/Coov1GGuBGNPo5nWlaoWKvYrKHu7BzgKxdaLw0x0KjlMGJJluBc/Asado0J44uQ7lecJWGwBGvNbsaGlOzF8O+qPABfn0DNtf45yHMkvEnIGEPsWfiodP3KoRTcYPIgPWvhRTC8nygHo X-MS-Exchange-AntiSpam-MessageData: 61jFZcFLtp4LGcMHP+5uXz7NRjIilnXyFrDH4R8MhSv37cciRZE/uRDdImiS8EoIp8Mj36TCiuMJbMd3aP9PTsgAdU+eee2Kj9n+wZFOf9UHecKu4XKJjQ10hjt8WkFlnZYc//GVYzISIclk8XCl5g== X-OriginatorOrg: outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 54934b61-836a-4c9a-6397-08d884b901a5 X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Nov 2020 14:09:00.8824 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 84df9e7f-e9f6-40af-b435-aaaaaaaaaaaa X-MS-Exchange-CrossTenant-AuthSource: AM7EUR06FT054.eop-eur06.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: Internet X-MS-Exchange-CrossTenant-RMS-PersistedConsumerOrg: 00000000-0000-0000-0000-000000000000 X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM7EUR06HT249 X-Spam-Status: No, score=1.2 required=5.0 tests=BAYES_00, FORGED_MUA_MOZILLA, FREEMAIL_FROM, KAM_DMARC_STATUS, MSGID_FROM_MTA_HEADER, NICE_REPLY_A, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2, SPF_HELO_PASS, SPF_PASS, TXREP autolearn=no autolearn_force=no version=3.4.2 X-Spam-Level: * X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: newlib@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Newlib mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 09 Nov 2020 14:09:04 -0000 Dear Rob, functionality is available in the Miosix OS, which uses newlib. You can have a look at the code to see how to implement such a functionality. The functionality you are interested in is the getAbsoluteFreeHeap() member function of the MemoryProfiling class. https://github.com/fedetft/miosix-kernel/blob/master/miosix/util/util.h#L88 It is implemented in terms of getMaxHeap() function that tracks heap requests directly from _sbrk_r https://github.com/fedetft/miosix-kernel/blob/master/miosix/stdlib_integration/libc_integration.cpp#L61 Hope this helps, Federico On 08/11/20 18:14, Rob Meades via Newlib wrote: > I run/test my library code on various embedded processors (STM32F4, NRF52/53, ESP32), all of which use newlib. > > I need to implement a "minimum heap ever available" watermark kind of function so that, after my tests are run, I can be sure that I have left sufficient room for user code to obtain heap memory. > > Such a facility does not seem to be available in newlib out of the box: does anyone have any recommendations on how to go about implementing such a function? > > For instance, is the newlib malloc()ater guaranteed to only call sbrk() when it really needs more memory, as opposed to when it might have free blocks available but it is "cheaper" to call sbrk() then to allocate from those blocks? If the former then simply monitoring sbrk() would do the job for me. If the latter then I probably have to intercept the malloc()/free() calls to track what's going on. > > Rob > > . >