From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mails.dpdk.org (mails.dpdk.org [217.70.189.124]) by inbox.dpdk.org (Postfix) with ESMTP id 41B4FA09E5; Wed, 23 Nov 2022 11:19:52 +0100 (CET) Received: from mails.dpdk.org (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id 0853842D8C; Wed, 23 Nov 2022 11:19:46 +0100 (CET) Received: from relay3-d.mail.gandi.net (relay3-d.mail.gandi.net [217.70.183.195]) by mails.dpdk.org (Postfix) with ESMTP id 9816240E5A for ; Wed, 23 Nov 2022 11:19:44 +0100 (CET) Received: (Authenticated sender: robin@jarry.cc) by mail.gandi.net (Postfix) with ESMTPSA id 13F8C60007; Wed, 23 Nov 2022 10:19:41 +0000 (UTC) From: Robin Jarry To: dev@dpdk.org Cc: Bruce Richardson , Jerin Jacob , Kevin Laatz , Konstantin Ananyev , =?UTF-8?q?Mattias=20R=C3=B6nnblom?= , =?UTF-8?q?Morten=20Br=C3=B8rup?= , Robin Jarry Subject: [RFC PATCH 2/4] eal: allow applications to report their cpu utilization Date: Wed, 23 Nov 2022 11:19:29 +0100 Message-Id: <20221123101931.1688238-3-rjarry@redhat.com> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221123101931.1688238-1-rjarry@redhat.com> References: <20221123101931.1688238-1-rjarry@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Allow applications to register a callback that will be invoked in rte_lcore_dump() and when requesting lcore info in the telemetry API. The callback is expected to return a number between 0 and 100 representing the percentage of busy cycles spent over a fixed period of time. The period of time is configured when registering the callback. Cc: Bruce Richardson Cc: Jerin Jacob Cc: Kevin Laatz Cc: Konstantin Ananyev Cc: Mattias Rönnblom Cc: Morten Brørup Signed-off-by: Robin Jarry --- lib/eal/common/eal_common_lcore.c | 37 ++++++++++++++++++++++++++++--- lib/eal/include/rte_lcore.h | 30 +++++++++++++++++++++++++ lib/eal/version.map | 1 + 3 files changed, 65 insertions(+), 3 deletions(-) diff --git a/lib/eal/common/eal_common_lcore.c b/lib/eal/common/eal_common_lcore.c index 31e3965dc5ad..9a85fd8854df 100644 --- a/lib/eal/common/eal_common_lcore.c +++ b/lib/eal/common/eal_common_lcore.c @@ -420,14 +420,36 @@ rte_lcore_iterate(rte_lcore_iterate_cb cb, void *arg) return ret; } +static rte_lcore_busy_percent_cb lcore_busy_cb; +static unsigned int lcore_busy_period; + +void +rte_lcore_register_busy_percent_cb(rte_lcore_busy_percent_cb cb, unsigned int period) +{ + lcore_busy_cb = cb; + lcore_busy_period = period; +} + +static int +lcore_busy_percent(unsigned int lcore_id) +{ + int percent = -1; + if (lcore_busy_cb) + percent = lcore_busy_cb(lcore_id); + if (percent > 100) + percent = 100; + return percent; +} + static int lcore_dump_cb(unsigned int lcore_id, void *arg) { struct rte_config *cfg = rte_eal_get_configuration(); char cpuset[RTE_CPU_AFFINITY_STR_LEN]; + char busy_str[16]; const char *role; FILE *f = arg; - int ret; + int ret, busy; switch (cfg->lcore_role[lcore_id]) { case ROLE_RTE: @@ -446,9 +468,16 @@ lcore_dump_cb(unsigned int lcore_id, void *arg) ret = eal_thread_dump_affinity(&lcore_config[lcore_id].cpuset, cpuset, sizeof(cpuset)); - fprintf(f, "lcore %u, socket %u, role %s, cpuset %s%s\n", lcore_id, + busy = lcore_busy_percent(lcore_id); + if (busy < 0) { + snprintf(busy_str, sizeof(busy_str), "%s", "N/A"); + } else { + snprintf(busy_str, sizeof(busy_str), "%d%% last %d sec", + busy, lcore_busy_period); + } + fprintf(f, "lcore %u, socket %u, role %s, cpuset %s%s, busy %s\n", lcore_id, rte_lcore_to_socket_id(lcore_id), role, cpuset, - ret == 0 ? "" : "..."); + ret == 0 ? "" : "...", busy_str); return 0; } @@ -517,6 +546,8 @@ lcore_telemetry_info_cb(unsigned int lcore_id, void *arg) rte_tel_data_add_dict_int(info->d, "socket", rte_lcore_to_socket_id(lcore_id)); rte_tel_data_add_dict_string(info->d, "role", role); rte_tel_data_add_dict_string(info->d, "cpuset", cpuset); + rte_tel_data_add_dict_int(info->d, "busy_percent", lcore_busy_percent(lcore_id)); + rte_tel_data_add_dict_int(info->d, "busy_period", lcore_busy_period); return 0; } diff --git a/lib/eal/include/rte_lcore.h b/lib/eal/include/rte_lcore.h index 6938c3fd7b81..b1223eaa12bf 100644 --- a/lib/eal/include/rte_lcore.h +++ b/lib/eal/include/rte_lcore.h @@ -328,6 +328,36 @@ typedef int (*rte_lcore_iterate_cb)(unsigned int lcore_id, void *arg); int rte_lcore_iterate(rte_lcore_iterate_cb cb, void *arg); +/** + * Callback to allow applications to report CPU utilization. + * + * @param lcore_id + * The lcore to consider. + * @return + * - A number between 0 and 100 representing the percentage of busy cycles + * over the last period for the given lcore_id. + * - -1 if the information is not available or if any error occurred. + */ +typedef int (*rte_lcore_busy_percent_cb)(unsigned int lcore_id); + +/** + * Register a callback from an application to be called in rte_lcore_dump() + * and the /eal/lcore/info telemetry endpoint handler. + * + * Applications are expected to return a number between 0 and 100 representing + * the percentage of busy cycles over the last period for the provided lcore_id. + * The implementation details for computing such a ratio is specific to each + * application. + * + * @param cb + * The callback function. + * @param period + * The period in seconds over which the percentage of busy cycles will be + * reported by the application. + */ +__rte_experimental +void rte_lcore_register_busy_percent_cb(rte_lcore_busy_percent_cb cb, unsigned int period); + /** * List all lcores. * diff --git a/lib/eal/version.map b/lib/eal/version.map index 7ad12a7dc985..138537ee5835 100644 --- a/lib/eal/version.map +++ b/lib/eal/version.map @@ -440,6 +440,7 @@ EXPERIMENTAL { rte_thread_detach; rte_thread_equal; rte_thread_join; + rte_lcore_register_busy_percent_cb; }; INTERNAL { -- 2.38.1