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GET /api/patches/105534/?format=api
{ "id": 105534, "url": "http://patchwork.dpdk.org/api/patches/105534/?format=api", "web_url": "http://patchwork.dpdk.org/project/dpdk/patch/20211230144828.3550807-1-dkozlyuk@nvidia.com/", "project": { "id": 1, "url": "http://patchwork.dpdk.org/api/projects/1/?format=api", "name": "DPDK", "link_name": "dpdk", "list_id": "dev.dpdk.org", "list_email": "dev@dpdk.org", "web_url": "http://core.dpdk.org", "scm_url": "git://dpdk.org/dpdk", "webscm_url": "http://git.dpdk.org/dpdk", "list_archive_url": "https://inbox.dpdk.org/dev", "list_archive_url_format": "https://inbox.dpdk.org/dev/{}", "commit_url_format": "" }, "msgid": "<20211230144828.3550807-1-dkozlyuk@nvidia.com>", "list_archive_url": "https://inbox.dpdk.org/dev/20211230144828.3550807-1-dkozlyuk@nvidia.com", "date": "2021-12-30T14:48:28", "name": "[RFC,5/6] eal: allow hugepage file reuse with --huge-unlink", "commit_ref": null, "pull_url": null, "state": "superseded", "archived": true, "hash": "9c7d0d4e064cb06165652836a4aa2724cceb71c3", "submitter": { "id": 2248, "url": "http://patchwork.dpdk.org/api/people/2248/?format=api", "name": "Dmitry Kozlyuk", "email": "dkozlyuk@nvidia.com" }, "delegate": { "id": 24651, "url": "http://patchwork.dpdk.org/api/users/24651/?format=api", "username": "dmarchand", "first_name": "David", "last_name": "Marchand", "email": "david.marchand@redhat.com" }, "mbox": "http://patchwork.dpdk.org/project/dpdk/patch/20211230144828.3550807-1-dkozlyuk@nvidia.com/mbox/", "series": [ { "id": 21042, "url": "http://patchwork.dpdk.org/api/series/21042/?format=api", "web_url": "http://patchwork.dpdk.org/project/dpdk/list/?series=21042", "date": "2021-12-30T14:37:38", "name": "Fast restart with many hugepages", "version": 1, "mbox": "http://patchwork.dpdk.org/series/21042/mbox/" } ], "comments": "http://patchwork.dpdk.org/api/patches/105534/comments/", "check": "warning", "checks": "http://patchwork.dpdk.org/api/patches/105534/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<dev-bounces@dpdk.org>", "X-Original-To": "patchwork@inbox.dpdk.org", "Delivered-To": "patchwork@inbox.dpdk.org", "Received": [ "from mails.dpdk.org (mails.dpdk.org [217.70.189.124])\n\tby inbox.dpdk.org (Postfix) with ESMTP id 5951EA04A5;\n\tThu, 30 Dec 2021 15:48:56 +0100 (CET)", "from [217.70.189.124] (localhost [127.0.0.1])\n\tby mails.dpdk.org (Postfix) with ESMTP id E04FE410F1;\n\tThu, 30 Dec 2021 15:48:55 +0100 (CET)", "from NAM12-MW2-obe.outbound.protection.outlook.com\n (mail-mw2nam12on2086.outbound.protection.outlook.com [40.107.244.86])\n by mails.dpdk.org (Postfix) with ESMTP id 295D440F35\n for <dev@dpdk.org>; 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helo=mail.nvidia.com;", "From": "Dmitry Kozlyuk <dkozlyuk@nvidia.com>", "To": "<dev@dpdk.org>", "CC": "Anatoly Burakov <anatoly.burakov@intel.com>", "Subject": "[RFC PATCH 5/6] eal: allow hugepage file reuse with --huge-unlink", "Date": "Thu, 30 Dec 2021 16:48:28 +0200", "Message-ID": "<20211230144828.3550807-1-dkozlyuk@nvidia.com>", "X-Mailer": "git-send-email 2.25.1", "In-Reply-To": "<20211230143744.3550098-1-dkozlyuk@nvidia.com>", "References": "<20211230143744.3550098-1-dkozlyuk@nvidia.com>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "Content-Type": "text/plain", "X-Originating-IP": "[172.20.187.6]", "X-ClientProxiedBy": "HQMAIL111.nvidia.com (172.20.187.18) To\n rnnvmail201.nvidia.com (10.129.68.8)", "X-EOPAttributedMessage": "0", "X-MS-PublicTrafficType": "Email", "X-MS-Office365-Filtering-Correlation-Id": "a1a00c35-f250-4d50-2f6b-08d9cba37f98", "X-MS-TrafficTypeDiagnostic": "BL1PR12MB5287:EE_", "X-Microsoft-Antispam-PRVS": "\n <BL1PR12MB5287C5390ACF89ADC4E6CE59B9459@BL1PR12MB5287.namprd12.prod.outlook.com>", "X-MS-Oob-TLC-OOBClassifiers": "OLM:8882;", "X-MS-Exchange-SenderADCheck": "1", "X-MS-Exchange-AntiSpam-Relay": "0", "X-Microsoft-Antispam": "BCL:0;", "X-Microsoft-Antispam-Message-Info": "\n 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", "X-Forefront-Antispam-Report": "CIP:12.22.5.234; CTRY:US; LANG:en; SCL:1; SRV:;\n IPV:CAL; SFV:NSPM; H:mail.nvidia.com; PTR:InfoNoRecords; CAT:NONE;\n SFS:(4636009)(46966006)(36840700001)(40470700002)(316002)(2906002)(36756003)(5660300002)(1076003)(6916009)(47076005)(70586007)(508600001)(6666004)(86362001)(2616005)(186003)(4326008)(83380400001)(426003)(55016003)(336012)(40460700001)(82310400004)(81166007)(6286002)(8936002)(356005)(8676002)(16526019)(7696005)(36860700001)(26005)(70206006)(14583001)(36900700001);\n DIR:OUT; SFP:1101;", "X-OriginatorOrg": "Nvidia.com", "X-MS-Exchange-CrossTenant-OriginalArrivalTime": "30 Dec 2021 14:48:52.9017 (UTC)", "X-MS-Exchange-CrossTenant-Network-Message-Id": "\n a1a00c35-f250-4d50-2f6b-08d9cba37f98", "X-MS-Exchange-CrossTenant-Id": "43083d15-7273-40c1-b7db-39efd9ccc17a", "X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp": "\n TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a; Ip=[12.22.5.234];\n Helo=[mail.nvidia.com]", "X-MS-Exchange-CrossTenant-AuthSource": "\n DM6NAM11FT060.eop-nam11.prod.protection.outlook.com", "X-MS-Exchange-CrossTenant-AuthAs": "Anonymous", "X-MS-Exchange-CrossTenant-FromEntityHeader": "HybridOnPrem", "X-MS-Exchange-Transport-CrossTenantHeadersStamped": "BL1PR12MB5287", "X-BeenThere": "dev@dpdk.org", "X-Mailman-Version": "2.1.29", "Precedence": "list", "List-Id": "DPDK patches and discussions <dev.dpdk.org>", "List-Unsubscribe": "<https://mails.dpdk.org/options/dev>,\n <mailto:dev-request@dpdk.org?subject=unsubscribe>", "List-Archive": "<http://mails.dpdk.org/archives/dev/>", "List-Post": "<mailto:dev@dpdk.org>", "List-Help": "<mailto:dev-request@dpdk.org?subject=help>", "List-Subscribe": "<https://mails.dpdk.org/listinfo/dev>,\n <mailto:dev-request@dpdk.org?subject=subscribe>", "Errors-To": "dev-bounces@dpdk.org" }, "content": "Expose Linux EAL ability to reuse existing hugepage files\nvia --huge-unlink=never switch.\nDefault behavior is unchanged, it can also be specified\nusing --huge-unlink=existing for consistency.\nOld --huge-unlink switch is kept,\nit is an alias for --huge-unlink=always.\n\nSigned-off-by: Dmitry Kozlyuk <dkozlyuk@nvidia.com>\n---\n doc/guides/linux_gsg/linux_eal_parameters.rst | 21 ++++++++--\n .../prog_guide/env_abstraction_layer.rst | 9 +++++\n doc/guides/rel_notes/release_22_03.rst | 7 ++++\n lib/eal/common/eal_common_options.c | 39 +++++++++++++++++--\n 4 files changed, 69 insertions(+), 7 deletions(-)", "diff": "diff --git a/doc/guides/linux_gsg/linux_eal_parameters.rst b/doc/guides/linux_gsg/linux_eal_parameters.rst\nindex 74df2611b5..64cd73b497 100644\n--- a/doc/guides/linux_gsg/linux_eal_parameters.rst\n+++ b/doc/guides/linux_gsg/linux_eal_parameters.rst\n@@ -84,10 +84,23 @@ Memory-related options\n Use specified hugetlbfs directory instead of autodetected ones. This can be\n a sub-directory within a hugetlbfs mountpoint.\n \n-* ``--huge-unlink``\n-\n- Unlink hugepage files after creating them (implies no secondary process\n- support).\n+* ``--huge-unlink[=existing|always|never]``\n+\n+ No ``--huge-unlink`` option or ``--huge-unlink=existing`` is the default:\n+ existing hugepage files are removed and re-created\n+ to ensure the kernel clears the memory and prevents any data leaks.\n+\n+ With ``--huge-unlink`` (no value) or ``--huge-unlink=always``,\n+ hugepage files are also removed after creating them,\n+ so that the application leaves no files in hugetlbfs.\n+ This mode implies no multi-process support.\n+\n+ When ``--huge-unlink=never`` is specified, existing hugepage files\n+ are not removed neither before nor after mapping them.\n+ This makes restart faster by saving time to clear memory at initialization,\n+ but it may slow down zeroed allocations later.\n+ Reused hugepages can contain data from previous processes that used them,\n+ which may be a security concern.\n \n * ``--match-allocations``\n \ndiff --git a/doc/guides/prog_guide/env_abstraction_layer.rst b/doc/guides/prog_guide/env_abstraction_layer.rst\nindex 6cddb86467..d8940f5e2e 100644\n--- a/doc/guides/prog_guide/env_abstraction_layer.rst\n+++ b/doc/guides/prog_guide/env_abstraction_layer.rst\n@@ -277,6 +277,15 @@ to prevent data leaks from previous users of the same hugepage.\n EAL ensures this behavior by removing existing backing files at startup\n and by recreating them before opening for mapping (as a precaution).\n \n+One expection is ``--huge-unlink=never`` mode.\n+It is used to speed up EAL initialization, usually on application restart.\n+Clearing memory constitutes more than 95% of hugepage mapping time.\n+EAL can save it by remapping existing backing files\n+with all the data left in the mapped hugepages (\"dirty\" memory).\n+Such segments are marked with ``RTE_MEMSEG_FLAG_DIRTY``.\n+Memory allocator detects dirty segments handles them accordingly,\n+in particular, it clears memory requested with ``rte_zmalloc*()``.\n+\n Anonymous mapping does not allow multi-process architecture,\n but it is free of filename conflicts and leftover files on hugetlbfs.\n If memfd_create(2) is supported both at build and run time,\ndiff --git a/doc/guides/rel_notes/release_22_03.rst b/doc/guides/rel_notes/release_22_03.rst\nindex 6d99d1eaa9..0b882362cf 100644\n--- a/doc/guides/rel_notes/release_22_03.rst\n+++ b/doc/guides/rel_notes/release_22_03.rst\n@@ -55,6 +55,13 @@ New Features\n Also, make sure to start the actual text at the margin.\n =======================================================\n \n+* **Added ability to reuse hugepages in Linux.**\n+\n+ It is possible to reuse files in hugetlbfs to speed up hugepage mapping,\n+ which may be useful for fast restart and large allocations.\n+ The new mode is activated with ``--huge-unlink=never``\n+ and has security implications, refer to the user and programmer guides.\n+\n \n Removed Items\n -------------\ndiff --git a/lib/eal/common/eal_common_options.c b/lib/eal/common/eal_common_options.c\nindex 7520ebda8e..905a7769bd 100644\n--- a/lib/eal/common/eal_common_options.c\n+++ b/lib/eal/common/eal_common_options.c\n@@ -74,7 +74,7 @@ eal_long_options[] = {\n \t{OPT_FILE_PREFIX, 1, NULL, OPT_FILE_PREFIX_NUM },\n \t{OPT_HELP, 0, NULL, OPT_HELP_NUM },\n \t{OPT_HUGE_DIR, 1, NULL, OPT_HUGE_DIR_NUM },\n-\t{OPT_HUGE_UNLINK, 0, NULL, OPT_HUGE_UNLINK_NUM },\n+\t{OPT_HUGE_UNLINK, 2, NULL, OPT_HUGE_UNLINK_NUM },\n \t{OPT_IOVA_MODE,\t 1, NULL, OPT_IOVA_MODE_NUM },\n \t{OPT_LCORES, 1, NULL, OPT_LCORES_NUM },\n \t{OPT_LOG_LEVEL, 1, NULL, OPT_LOG_LEVEL_NUM },\n@@ -1596,6 +1596,28 @@ available_cores(void)\n \treturn str;\n }\n \n+#define HUGE_UNLINK_NEVER \"never\"\n+\n+static int\n+eal_parse_huge_unlink(const char *arg, struct hugepage_file_discipline *out)\n+{\n+\tif (arg == NULL || strcmp(arg, \"always\") == 0) {\n+\t\tout->unlink_before_mapping = true;\n+\t\treturn 0;\n+\t}\n+\tif (strcmp(arg, \"existing\") == 0) {\n+\t\t/* same as not specifying the option */\n+\t\treturn 0;\n+\t}\n+\tif (strcmp(arg, HUGE_UNLINK_NEVER) == 0) {\n+\t\tRTE_LOG(WARNING, EAL, \"Using --\"OPT_HUGE_UNLINK\"=\"\n+\t\t\tHUGE_UNLINK_NEVER\" may create data leaks.\\n\");\n+\t\tout->keep_existing = true;\n+\t\treturn 0;\n+\t}\n+\treturn -1;\n+}\n+\n int\n eal_parse_common_option(int opt, const char *optarg,\n \t\t\tstruct internal_config *conf)\n@@ -1737,7 +1759,10 @@ eal_parse_common_option(int opt, const char *optarg,\n \n \t/* long options */\n \tcase OPT_HUGE_UNLINK_NUM:\n-\t\tconf->hugepage_file.unlink_before_mapping = true;\n+\t\tif (eal_parse_huge_unlink(optarg, &conf->hugepage_file) < 0) {\n+\t\t\tRTE_LOG(ERR, EAL, \"invalid --\"OPT_HUGE_UNLINK\" option\\n\");\n+\t\t\treturn -1;\n+\t\t}\n \t\tbreak;\n \n \tcase OPT_NO_HUGE_NUM:\n@@ -2068,6 +2093,12 @@ eal_check_common_options(struct internal_config *internal_cfg)\n \t\t\t\"not compatible with --\"OPT_HUGE_UNLINK\"\\n\");\n \t\treturn -1;\n \t}\n+\tif (internal_cfg->hugepage_file.keep_existing &&\n+\t\t\tinternal_cfg->in_memory) {\n+\t\tRTE_LOG(ERR, EAL, \"Option --\"OPT_IN_MEMORY\" is not compatible \"\n+\t\t\t\"with --\"OPT_HUGE_UNLINK\"=\"HUGE_UNLINK_NEVER\"\\n\");\n+\t\treturn -1;\n+\t}\n \tif (internal_cfg->legacy_mem &&\n \t\t\tinternal_cfg->in_memory) {\n \t\tRTE_LOG(ERR, EAL, \"Option --\"OPT_LEGACY_MEM\" is not compatible \"\n@@ -2200,7 +2231,9 @@ eal_common_usage(void)\n \t \" --\"OPT_NO_TELEMETRY\" Disable telemetry support\\n\"\n \t \" --\"OPT_FORCE_MAX_SIMD_BITWIDTH\" Force the max SIMD bitwidth\\n\"\n \t \"\\nEAL options for DEBUG use only:\\n\"\n-\t \" --\"OPT_HUGE_UNLINK\" Unlink hugepage files after init\\n\"\n+\t \" --\"OPT_HUGE_UNLINK\"[=existing|always|never]\\n\"\n+\t \" When to unlink files in hugetlbfs\\n\"\n+\t \" ('existing' by default, no value means 'always')\\n\"\n \t \" --\"OPT_NO_HUGE\" Use malloc instead of hugetlbfs\\n\"\n \t \" --\"OPT_NO_PCI\" Disable PCI\\n\"\n \t \" --\"OPT_NO_HPET\" Disable HPET\\n\"\n", "prefixes": [ "RFC", "5/6" ] }