[PATCH 4/4] eal: set affinity for control threads
From: Olivier Matz <hidden>
Date: 2018-02-27 14:46:50
Subsystem:
library code, the rest · Maintainers:
Andrew Morton, Linus Torvalds
The management threads must not bother the dataplane or service cores. Set the affinity of these threads accordingly. Signed-off-by: Olivier Matz <redacted> --- lib/librte_eal/common/eal_common_thread.c | 20 +++++++++++++++++++- lib/librte_eal/common/include/rte_lcore.h | 4 +++- 2 files changed, 22 insertions(+), 2 deletions(-)
diff --git a/lib/librte_eal/common/eal_common_thread.c b/lib/librte_eal/common/eal_common_thread.c
index 575b03e9d..f2e588c97 100644
--- a/lib/librte_eal/common/eal_common_thread.c
+++ b/lib/librte_eal/common/eal_common_thread.c@@ -16,6 +16,7 @@ #include <rte_memory.h> #include <rte_log.h> +#include "eal_private.h" #include "eal_thread.h" RTE_DECLARE_PER_LCORE(unsigned , _socket_id);
@@ -169,7 +170,9 @@ rte_ctrl_thread_create(pthread_t *thread, const char *name, .start_routine = start_routine, .arg = arg, }; - int ret; + unsigned int lcore_id; + rte_cpuset_t cpuset; + int set_affinity, ret; pthread_barrier_init(¶ms.configured, NULL, 2);
@@ -183,6 +186,21 @@ rte_ctrl_thread_create(pthread_t *thread, const char *name, goto fail; } + set_affinity = 0; + CPU_ZERO(&cpuset); + for (lcore_id = 0; lcore_id < RTE_MAX_LCORE; lcore_id++) { + if (eal_cpu_detected(lcore_id) && + rte_lcore_has_role(lcore_id, ROLE_OFF)) { + CPU_SET(lcore_id, &cpuset); + set_affinity = 1; + } + } + if (set_affinity) { + ret = pthread_setaffinity_np(*thread, sizeof(cpuset), &cpuset); + if (ret < 0) + goto fail; + } + pthread_barrier_wait(¶ms.configured); return 0;
diff --git a/lib/librte_eal/common/include/rte_lcore.h b/lib/librte_eal/common/include/rte_lcore.h
index f3d9bbb91..354717c5d 100644
--- a/lib/librte_eal/common/include/rte_lcore.h
+++ b/lib/librte_eal/common/include/rte_lcore.h@@ -249,7 +249,9 @@ int rte_thread_setname(pthread_t id, const char *name); /** * Create a control thread. * - * Wrapper to pthread_create() and pthread_setname_np(). + * Wrapper to pthread_create(), pthread_setname_np() and + * pthread_setaffinity_np(). The dataplane and service lcores are + * excluded from the affinity of the new thread. * * @param thread * Filled with the thread id of the new created thread.
--
2.11.0