From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga11.intel.com (mga11.intel.com [192.55.52.93]) by dpdk.org (Postfix) with ESMTP id DDE442142 for ; Wed, 31 Aug 2016 05:07:08 +0200 (CEST) Received: from orsmga004.jf.intel.com ([10.7.209.38]) by fmsmga102.fm.intel.com with ESMTP; 30 Aug 2016 20:07:07 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.30,260,1470726000"; d="scan'208";a="3222973" Received: from dpdk06.sh.intel.com ([10.239.129.195]) by orsmga004.jf.intel.com with ESMTP; 30 Aug 2016 20:07:05 -0700 From: Jianfeng Tan To: dev@dpdk.org Cc: david.marchand@6wind.com, pmatilai@redhat.com, thomas.monjalon@6wind.com, Jianfeng Tan Date: Wed, 31 Aug 2016 03:07:10 +0000 Message-Id: <1472612830-131693-1-git-send-email-jianfeng.tan@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1453661393-85704-1-git-send-email-jianfeng.tan@intel.com> References: <1453661393-85704-1-git-send-email-jianfeng.tan@intel.com> Subject: [dpdk-dev] [PATCH v2] eal: restrict cores detection X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: patches and discussions about DPDK List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 31 Aug 2016 03:07:09 -0000 This patch uses pthread_getaffinity_np() to narrow down detected cores before parsing coremask (-c), corelist (-l), and coremap (--lcores). The purpose of this patch is to leave out these core related options when DPDK applications are deployed under container env, so that users only specify core restriction as starting the instance. Note: previously, some users are using isolated CPUs, which could be excluded by default. Please add commands like taskset to use those cores. Test example: $ taskset 0xc0000 ./examples/helloworld/build/helloworld -m 1024 Signed-off-by: Jianfeng Tan Acked-by: Neil Horman --- v2: - Make it as default instead of adding the new options. lib/librte_eal/common/eal_common_lcore.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/lib/librte_eal/common/eal_common_lcore.c b/lib/librte_eal/common/eal_common_lcore.c index 2cd4132..62e4f67 100644 --- a/lib/librte_eal/common/eal_common_lcore.c +++ b/lib/librte_eal/common/eal_common_lcore.c @@ -57,6 +57,14 @@ rte_eal_cpu_init(void) struct rte_config *config = rte_eal_get_configuration(); unsigned lcore_id; unsigned count = 0; + rte_cpuset_t cs; + pthread_t tid = pthread_self(); + + /* Add below method to obtain core restrictions, like ulimit, + * cgroup.cpuset, etc. Will not use those cores, which are rebuffed. + */ + if (pthread_getaffinity_np(tid, sizeof(rte_cpuset_t), &cs) < 0) + CPU_ZERO(&cs); /* * Parse the maximum set of logical cores, detect the subset of running @@ -70,7 +78,8 @@ rte_eal_cpu_init(void) /* in 1:1 mapping, record related cpu detected state */ lcore_config[lcore_id].detected = eal_cpu_detected(lcore_id); - if (lcore_config[lcore_id].detected == 0) { + if (lcore_config[lcore_id].detected == 0 || + !CPU_ISSET(lcore_id, &cs)) { config->lcore_role[lcore_id] = ROLE_OFF; lcore_config[lcore_id].core_index = -1; continue; -- 2.7.4