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[ { "id": 116524, "web_url": "https://patches.dpdk.org/comment/116524/", "msgid": "<DB6PR0802MB221641972BF66E61186561F298790@DB6PR0802MB2216.eurprd08.prod.outlook.com>", "list_archive_url": "https://inbox.dpdk.org/dev/DB6PR0802MB221641972BF66E61186561F298790@DB6PR0802MB2216.eurprd08.prod.outlook.com", "date": "2020-07-22T21:39:22", "subject": "Re: [dpdk-dev] [PATCH v3 1/2] service: add API to retrieve service\n\tcore active", "submitter": { "id": 1045, "url": "https://patches.dpdk.org/api/people/1045/?format=api", "name": "Honnappa Nagarahalli", "email": "honnappa.nagarahalli@arm.com" }, "content": "<snip>\n\n> Subject: [PATCH v3 1/2] service: add API to retrieve service core active\n> \n> This commit adds a new experimental API which allows the user to retrieve\n> the active state of an lcore. Knowing when the service lcore is completed its\n> polling loop can be useful to applications to avoid race conditions when e.g.\n> finalizing statistics.\n> \n> The service thread itself now has a variable to indicate if its thread is active.\n> When zero the service thread has completed its service, and has returned\n> from the service_runner_func() function.\n> \n> Suggested-by: Lukasz Wojciechowski <l.wojciechow@partner.samsung.com>\n> Signed-off-by: Harry van Haaren <harry.van.haaren@intel.com>\n> Reviewed-by: Phil Yang <phil.yang@arm.com>\n\nOver all looks good, few nits inline.\nReviewed-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>\n\n> \n> ---\n> \n> v3:\n> - Change service lcore stores to SEQ_CST (Honnappa, David)\n> - Change control thread load to ACQ (Honnappa, David)\n> - Comment reasons for SEQ_CST/ACQ (Honnappa, David)\n> - Add comments to Doxygen for _stop() and _lcore_active() (Honnappa, David)\n> - Add Phil's review tag from ML\n> ---\n> lib/librte_eal/common/rte_service.c | 23 ++++++++++++++++++++++-\n> lib/librte_eal/include/rte_service.h | 20 +++++++++++++++++++-\n> lib/librte_eal/rte_eal_version.map | 1 +\n> 3 files changed, 42 insertions(+), 2 deletions(-)\n> \n> diff --git a/lib/librte_eal/common/rte_service.c\n> b/lib/librte_eal/common/rte_service.c\n> index 6a0e0ff65..b0cf7c4ab 100644\n> --- a/lib/librte_eal/common/rte_service.c\n> +++ b/lib/librte_eal/common/rte_service.c\n> @@ -65,6 +65,7 @@ struct core_state {\n> \t/* map of services IDs are run on this core */\n> \tuint64_t service_mask;\n> \tuint8_t runstate; /* running or stopped */\n> +\tuint8_t thread_active; /* indicates when thread is in service_run() */\n> \tuint8_t is_service_core; /* set if core is currently a service core */\n> \tuint8_t service_active_on_lcore[RTE_SERVICE_NUM_MAX];\n> \tuint64_t loops;\n> @@ -422,7 +423,7 @@ rte_service_may_be_active(uint32_t id)\n> \t\treturn -EINVAL;\n> \n> \tfor (i = 0; i < lcore_count; i++) {\n> -\t\tif (lcore_states[ids[i]].service_active_on_lcore[id])\n> +\tif (lcore_states[ids[i]].service_active_on_lcore[id])\nnit, I think the <tab> is required here.\n\n> \t\t\treturn 1;\n> \t}\n> \n> @@ -457,6 +458,8 @@ service_runner_func(void *arg)\n> \tconst int lcore = rte_lcore_id();\n> \tstruct core_state *cs = &lcore_states[lcore];\n> \n> +\t__atomic_store_n(&cs->thread_active, 1, __ATOMIC_SEQ_CST);\n> +\n> \t/* runstate act as the guard variable. Use load-acquire\n> \t * memory order here to synchronize with store-release\n> \t * in runstate update functions.\n> @@ -475,9 +478,27 @@ service_runner_func(void *arg)\n> \t\tcs->loops++;\n> \t}\n> \n> +\t/* Use SEQ CST memory ordering to avoid any re-ordering around\n> +\t * this store, ensuring that once this store is visible, the service\n> +\t * lcore thread really is done in service cores code.\n> +\t */\n> +\t__atomic_store_n(&cs->thread_active, 0, __ATOMIC_SEQ_CST);\n> \treturn 0;\n> }\n> \n> +int32_t\n> +rte_service_lcore_active(uint32_t lcore) {\n> +\tif (lcore >= RTE_MAX_LCORE || !lcore_states[lcore].is_service_core)\n> +\t\treturn -EINVAL;\n> +\n> +\t/* Load thread_active using ACQUIRE to avoid instructions dependent\n> on\n> +\t * the result being re-ordered before this load completes.\n> +\t */\n> +\treturn __atomic_load_n(&lcore_states[lcore].thread_active,\n> +\t\t\t __ATOMIC_ACQUIRE);\n> +}\n> +\n> int32_t\n> rte_service_lcore_count(void)\n> {\n> diff --git a/lib/librte_eal/include/rte_service.h\n> b/lib/librte_eal/include/rte_service.h\n> index e2d0a6dd3..84245020d 100644\n> --- a/lib/librte_eal/include/rte_service.h\n> +++ b/lib/librte_eal/include/rte_service.h\n> @@ -249,7 +249,9 @@ int32_t rte_service_lcore_start(uint32_t lcore_id);\n> * Stop a service core.\n> *\n> * Stopping a core makes the core become idle, but remains assigned as a\n> - * service core.\n> + * service core. Note that the service lcore thread may not have\n> + returned from\n> + * the service it is running when this API returns. To check if the\n> + service\n> + * lcore is still active, the *rte_service_lcore_active* API is added.\nnit\nInstead of \"To check if the service lcore is still active, the *rte_service_lcore_active* API is added.\", may be \"*rte_service_lcore_active* API can be used to check if the service lcore is still active\"?\n\n> *\n> * @retval 0 Success\n> * @retval -EINVAL Invalid *lcore_id* provided @@ -261,6 +263,22 @@\n> int32_t rte_service_lcore_start(uint32_t lcore_id);\n> */\n> int32_t rte_service_lcore_stop(uint32_t lcore_id);\n> \n> +/**\n> + * Reports if a service lcore is currently running.\nnit ^^^^^^^^^^^^^^^ may be \"currently running mapped services\"? (matching with the documentation for existing APIs)\n\n> + *\n> + * This function returns if the core has finished service cores code,\nnit ^^^^^^^^^^^^^^^^^^^^^^ may be \"completed running assigned services\"?\n\n> +and has\n> + * returned to EAL control. If *rte_service_lcore_stop* has been called\n> +but\n> + * the lcore has not returned to EAL yet, it might be required to wait\n> +and call\n> + * this function again. The amount of time to wait before the core\n> +returns\n> + * depends on the duration of the services being run.\n> + *\n> + * @retval 0 Service thread is not active, and has been returned to EAL.\nnit, ^^^^^ lcore?\n> + * @retval 1 Service thread is in the service core polling loop.\nnit, may be \"Service lcore is running assigned services.\"? (matching the terms used in existing APIs)\n\n> + * @retval -EINVAL Invalid *lcore_id* provided.\n> + */\n> +__rte_experimental\n> +int32_t rte_service_lcore_active(uint32_t lcore_id);\n> +\n> /**\n> * Adds lcore to the list of service cores.\n> *\n> diff --git a/lib/librte_eal/rte_eal_version.map\n> b/lib/librte_eal/rte_eal_version.map\n> index bf0c17c23..d53d5d5b9 100644\n> --- a/lib/librte_eal/rte_eal_version.map\n> +++ b/lib/librte_eal/rte_eal_version.map\n> @@ -401,6 +401,7 @@ EXPERIMENTAL {\n> \trte_lcore_dump;\n> \trte_lcore_iterate;\n> \trte_mp_disable;\n> +\trte_service_lcore_active;\n> \trte_thread_register;\n> \trte_thread_unregister;\n> };\n> --\n> 2.17.1", "headers": { "Return-Path": "<dev-bounces@dpdk.org>", "X-Original-To": "patchwork@inbox.dpdk.org", "Delivered-To": "patchwork@inbox.dpdk.org", "Received": [ "from dpdk.org (dpdk.org [92.243.14.124])\n\tby inbox.dpdk.org (Postfix) with ESMTP id B5BD7A0526;\n\tWed, 22 Jul 2020 23:39:34 +0200 (CEST)", "from [92.243.14.124] (localhost [127.0.0.1])\n\tby dpdk.org (Postfix) with ESMTP id C98B51BFBB;\n\tWed, 22 Jul 2020 23:39:33 +0200 (CEST)", "from EUR03-VE1-obe.outbound.protection.outlook.com\n (mail-eopbgr50058.outbound.protection.outlook.com [40.107.5.58])\n by dpdk.org (Postfix) with ESMTP id CDA0C1BF7B\n for <dev@dpdk.org>; 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mx.microsoft.com 1; spf=pass\n smtp.mailfrom=arm.com; dmarc=pass action=none header.from=arm.com; dkim=pass\n header.d=arm.com; arc=none", "From": "Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>", "To": "Harry van Haaren <harry.van.haaren@intel.com>, \"dev@dpdk.org\"\n <dev@dpdk.org>", "CC": "\"david.marchand@redhat.com\" <david.marchand@redhat.com>,\n \"igor.romanov@oktetlabs.ru\" <igor.romanov@oktetlabs.ru>,\n \"ferruh.yigit@intel.com\" <ferruh.yigit@intel.com>, nd <nd@arm.com>,\n \"aconole@redhat.com\" <aconole@redhat.com>, \"l.wojciechow@partner.samsung.com\"\n <l.wojciechow@partner.samsung.com>, Phil Yang <Phil.Yang@arm.com>, Honnappa\n Nagarahalli <Honnappa.Nagarahalli@arm.com>, nd <nd@arm.com>", "Thread-Topic": "[PATCH v3 1/2] service: add API to retrieve service core active", "Thread-Index": "AQHWYBP1HnOlVWXjVE2oOAlHdmWMxakUGZhw", "Date": "Wed, 22 Jul 2020 21:39:22 +0000", "Message-ID": "\n <DB6PR0802MB221641972BF66E61186561F298790@DB6PR0802MB2216.eurprd08.prod.outlook.com>", "References": "<20200720143829.46280-1-harry.van.haaren@intel.com>\n <20200722103701.7244-1-harry.van.haaren@intel.com>", "In-Reply-To": "<20200722103701.7244-1-harry.van.haaren@intel.com>", "Accept-Language": "en-US", "Content-Language": "en-US", "X-MS-Has-Attach": "", "X-MS-TNEF-Correlator": "", "x-ts-tracking-id": "2a693f79-7381-4c00-b816-233b2380c8f3.0", "x-checkrecipientchecked": "true", "Authentication-Results-Original": "intel.com; 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