From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga12.intel.com (mga12.intel.com [192.55.52.136]) by dpdk.org (Postfix) with ESMTP id A067E5587 for ; Mon, 15 Oct 2018 23:21:27 +0200 (CEST) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga001.jf.intel.com ([10.7.209.18]) by fmsmga106.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 15 Oct 2018 14:21:26 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.54,385,1534834800"; d="scan'208";a="99677590" Received: from silpixa00399752.ir.intel.com (HELO silpixa00399752.ger.corp.intel.com) ([10.237.222.212]) by orsmga001.jf.intel.com with ESMTP; 15 Oct 2018 14:21:25 -0700 From: Ferruh Yigit To: Bruce Richardson Cc: dev@dpdk.org, Ferruh Yigit , stephen@networkplumber.org Date: Mon, 15 Oct 2018 23:21:09 +0100 Message-Id: <20181015222110.61564-1-ferruh.yigit@intel.com> X-Mailer: git-send-email 2.17.2 In-Reply-To: <20181011195753.4778-1-ferruh.yigit@intel.com> References: <20181011195753.4778-1-ferruh.yigit@intel.com> Subject: [dpdk-dev] [PATCH v2 1/2] eal: add API that sleeps while waiting for threads X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 15 Oct 2018 21:21:28 -0000 It is common that sample applications call rte_eal_wait_lcore() while waiting for worker threads to be terminated. Mostly master lcore keeps waiting in this function. The waiting app for termination is not a time critical task, app can prefer a sleep version of the waiting to consume less cycles. A sleeping version of the API, rte_eal_wait_lcore_sleep(), has been added which uses pthread conditions. Sample applications will be updated later to use this API. Signed-off-by: Ferruh Yigit --- v2: * use pthread cond instead of usleep --- lib/librte_eal/bsdapp/eal/eal.c | 3 +++ lib/librte_eal/bsdapp/eal/eal_thread.c | 7 ++++++ lib/librte_eal/common/eal_common_launch.c | 22 ++++++++++++++++++ lib/librte_eal/common/include/rte_launch.h | 26 ++++++++++++++++++++++ lib/librte_eal/common/include/rte_lcore.h | 3 +++ lib/librte_eal/linuxapp/eal/eal.c | 3 +++ lib/librte_eal/linuxapp/eal/eal_thread.c | 7 ++++++ lib/librte_eal/rte_eal_version.map | 1 + 8 files changed, 72 insertions(+) diff --git a/lib/librte_eal/bsdapp/eal/eal.c b/lib/librte_eal/bsdapp/eal/eal.c index 7735194a3..e7d676657 100644 --- a/lib/librte_eal/bsdapp/eal/eal.c +++ b/lib/librte_eal/bsdapp/eal/eal.c @@ -756,6 +756,9 @@ rte_eal_init(int argc, char **argv) snprintf(thread_name, sizeof(thread_name), "lcore-slave-%d", i); rte_thread_setname(lcore_config[i].thread_id, thread_name); + + pthread_mutex_init(&rte_eal_thread_mutex[i], NULL); + pthread_cond_init(&rte_eal_thread_cond[i], NULL); } /* diff --git a/lib/librte_eal/bsdapp/eal/eal_thread.c b/lib/librte_eal/bsdapp/eal/eal_thread.c index 309b58726..60db32d57 100644 --- a/lib/librte_eal/bsdapp/eal/eal_thread.c +++ b/lib/librte_eal/bsdapp/eal/eal_thread.c @@ -28,6 +28,9 @@ RTE_DEFINE_PER_LCORE(unsigned, _lcore_id) = LCORE_ID_ANY; RTE_DEFINE_PER_LCORE(unsigned, _socket_id) = (unsigned)SOCKET_ID_ANY; RTE_DEFINE_PER_LCORE(rte_cpuset_t, _cpuset); +pthread_cond_t rte_eal_thread_cond[RTE_MAX_LCORE]; +pthread_mutex_t rte_eal_thread_mutex[RTE_MAX_LCORE]; + /* * Send a message to a slave lcore identified by slave_id to call a * function f with argument arg. Once the execution is done, the @@ -154,6 +157,10 @@ eal_thread_loop(__attribute__((unused)) void *arg) lcore_config[lcore_id].ret = ret; rte_wmb(); lcore_config[lcore_id].state = FINISHED; + + pthread_mutex_lock(&rte_eal_thread_mutex[lcore_id]); + pthread_cond_signal(&rte_eal_thread_cond[lcore_id]); + pthread_mutex_unlock(&rte_eal_thread_mutex[lcore_id]); } /* never reached */ diff --git a/lib/librte_eal/common/eal_common_launch.c b/lib/librte_eal/common/eal_common_launch.c index fe0ba3f0d..ebfa65847 100644 --- a/lib/librte_eal/common/eal_common_launch.c +++ b/lib/librte_eal/common/eal_common_launch.c @@ -5,6 +5,7 @@ #include #include #include +#include #include #include @@ -35,6 +36,27 @@ rte_eal_wait_lcore(unsigned slave_id) return lcore_config[slave_id].ret; } +/* + * Wait until a lcore finished its job by pthread condition. + */ +int +rte_eal_wait_lcore_sleep(unsigned slave_id) +{ + if (lcore_config[slave_id].state == WAIT) + return 0; + + pthread_mutex_lock(&rte_eal_thread_mutex[slave_id]); + while (lcore_config[slave_id].state != WAIT && + lcore_config[slave_id].state != FINISHED) + pthread_cond_wait(&rte_eal_thread_cond[slave_id], + &rte_eal_thread_mutex[slave_id]); + pthread_mutex_unlock(&rte_eal_thread_mutex[slave_id]); + + /* we are in finished state, go to wait state */ + lcore_config[slave_id].state = WAIT; + return lcore_config[slave_id].ret; +} + /* * Check that every SLAVE lcores are in WAIT state, then call * rte_eal_remote_launch() for all of them. If call_master is true diff --git a/lib/librte_eal/common/include/rte_launch.h b/lib/librte_eal/common/include/rte_launch.h index 06a671752..0306f7c3a 100644 --- a/lib/librte_eal/common/include/rte_launch.h +++ b/lib/librte_eal/common/include/rte_launch.h @@ -11,6 +11,8 @@ * Launch tasks on other lcores */ +#include + #ifdef __cplusplus extern "C" { #endif @@ -129,6 +131,30 @@ enum rte_lcore_state_t rte_eal_get_lcore_state(unsigned slave_id); */ int rte_eal_wait_lcore(unsigned slave_id); + +/** + * @warning + * @b EXPERIMENTAL: this API may change without prior notice + * + * Wait until an lcore finishes its job. + * + * To be executed on the MASTER lcore only. + * + * Same as rte_eal_wait_lcore() but waits using pthread conditions + * instead of polling in busy loop. + * + * @param slave_id + * The identifier of the lcore. + * @return + * - 0: If the lcore identified by the slave_id is in a WAIT state. + * - The value that was returned by the previous remote launch + * function call if the lcore identified by the slave_id was in a + * FINISHED or RUNNING state. In this case, it changes the state + * of the lcore to WAIT. + */ +__rte_experimental int +rte_eal_wait_lcore_sleep(unsigned slave_id); + /** * Wait until all lcores finish their jobs. * diff --git a/lib/librte_eal/common/include/rte_lcore.h b/lib/librte_eal/common/include/rte_lcore.h index 6e09d9181..9ce8bf643 100644 --- a/lib/librte_eal/common/include/rte_lcore.h +++ b/lib/librte_eal/common/include/rte_lcore.h @@ -53,6 +53,9 @@ struct lcore_config { */ extern struct lcore_config lcore_config[RTE_MAX_LCORE]; +extern pthread_cond_t rte_eal_thread_cond[RTE_MAX_LCORE]; +extern pthread_mutex_t rte_eal_thread_mutex[RTE_MAX_LCORE]; + RTE_DECLARE_PER_LCORE(unsigned, _lcore_id); /**< Per thread "lcore id". */ RTE_DECLARE_PER_LCORE(rte_cpuset_t, _cpuset); /**< Per thread "cpuset". */ diff --git a/lib/librte_eal/linuxapp/eal/eal.c b/lib/librte_eal/linuxapp/eal/eal.c index 950f33f2c..9d69a0642 100644 --- a/lib/librte_eal/linuxapp/eal/eal.c +++ b/lib/librte_eal/linuxapp/eal/eal.c @@ -1019,6 +1019,9 @@ rte_eal_init(int argc, char **argv) lcore_config[i].state = WAIT; + pthread_mutex_init(&rte_eal_thread_mutex[i], NULL); + pthread_cond_init(&rte_eal_thread_cond[i], NULL); + /* create a thread for each lcore */ ret = pthread_create(&lcore_config[i].thread_id, NULL, eal_thread_loop, NULL); diff --git a/lib/librte_eal/linuxapp/eal/eal_thread.c b/lib/librte_eal/linuxapp/eal/eal_thread.c index b496fc711..5381c7aa2 100644 --- a/lib/librte_eal/linuxapp/eal/eal_thread.c +++ b/lib/librte_eal/linuxapp/eal/eal_thread.c @@ -28,6 +28,9 @@ RTE_DEFINE_PER_LCORE(unsigned, _lcore_id) = LCORE_ID_ANY; RTE_DEFINE_PER_LCORE(unsigned, _socket_id) = (unsigned)SOCKET_ID_ANY; RTE_DEFINE_PER_LCORE(rte_cpuset_t, _cpuset); +pthread_cond_t rte_eal_thread_cond[RTE_MAX_LCORE]; +pthread_mutex_t rte_eal_thread_mutex[RTE_MAX_LCORE]; + /* * Send a message to a slave lcore identified by slave_id to call a * function f with argument arg. Once the execution is done, the @@ -161,6 +164,10 @@ eal_thread_loop(__attribute__((unused)) void *arg) lcore_config[lcore_id].state = WAIT; else lcore_config[lcore_id].state = FINISHED; + + pthread_mutex_lock(&rte_eal_thread_mutex[lcore_id]); + pthread_cond_signal(&rte_eal_thread_cond[lcore_id]); + pthread_mutex_unlock(&rte_eal_thread_mutex[lcore_id]); } /* never reached */ diff --git a/lib/librte_eal/rte_eal_version.map b/lib/librte_eal/rte_eal_version.map index e968edc2e..6c636a65d 100644 --- a/lib/librte_eal/rte_eal_version.map +++ b/lib/librte_eal/rte_eal_version.map @@ -292,6 +292,7 @@ EXPERIMENTAL { rte_devargs_remove; rte_devargs_type_count; rte_eal_cleanup; + rte_eal_wait_lcore_sleep; rte_fbarray_attach; rte_fbarray_destroy; rte_fbarray_detach; -- 2.17.2