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 BEE76A0C4B; Thu, 19 Aug 2021 23:32:14 +0200 (CEST) Received: from [217.70.189.124] (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id 078274124B; Thu, 19 Aug 2021 23:31:55 +0200 (CEST) Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by mails.dpdk.org (Postfix) with ESMTP id 6658841229 for ; Thu, 19 Aug 2021 23:31:47 +0200 (CEST) Received: by linux.microsoft.com (Postfix, from userid 1059) id BCBF920C33BB; Thu, 19 Aug 2021 14:31:46 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com BCBF920C33BB DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1629408706; bh=GjsApExNRnIGGqKPn5VgHry7woaUytyzAN1HgrdS5II=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ZOULH4MbeIe/EYIc8KnZK+sywM5rm8qTbuEe/Pw1BGzELZSzahs+jngr5Cj3y05s1 hBP1Ni+CEVjkjTdaf39nXF74YfndpiEjES1XeDkD6NkdEhnyOBEurvzBo5jCWFDja+ 6JBParjSydqKZx1yS6QusQlBuO3WymNQ+6TpUYTg= From: Narcisa Ana Maria Vasile To: dev@dpdk.org, thomas@monjalon.net, dmitry.kozliuk@gmail.com, khot@microsoft.com, navasile@microsoft.com, dmitrym@microsoft.com, roretzla@microsoft.com, talshn@nvidia.com, ocardona@microsoft.com Cc: bruce.richardson@intel.com, david.marchand@redhat.com, pallavi.kadam@intel.com Date: Thu, 19 Aug 2021 14:31:30 -0700 Message-Id: <1629408694-31803-6-git-send-email-navasile@linux.microsoft.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1629408694-31803-1-git-send-email-navasile@linux.microsoft.com> References: <1628017291-3756-1-git-send-email-navasile@linux.microsoft.com> <1629408694-31803-1-git-send-email-navasile@linux.microsoft.com> Subject: [dpdk-dev] [PATCH v14 5/9] eal: implement thread priority management functions 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 Sender: "dev" From: Narcisa Vasile Add function for setting the priority for a thread. Priorities on multiple platforms are similarly determined by a priority value and a priority class/policy. On Linux, the following mapping is created: RTE_THREAD_PRIORITY_NORMAL corresponds to * policy SCHED_OTHER * priority value: (sched_get_priority_min(SCHED_OTHER) + sched_get_priority_max(SCHED_OTHER))/2; RTE_THREAD_PRIORITY_REALTIME_CRITICAL corresponds to * policy SCHED_RR * priority value: sched_get_priority_max(SCHED_RR); On Windows, the following mapping is created: RTE_THREAD_PRIORITY_NORMAL corresponds to * class NORMAL_PRIORITY_CLASS * priority THREAD_PRIORITY_NORMAL RTE_THREAD_PRIORITY_REALTIME_CRITICAL corresponds to * class REALTIME_PRIORITY_CLASS * priority THREAD_PRIORITY_TIME_CRITICAL Signed-off-by: Narcisa Vasile --- lib/eal/common/rte_thread.c | 49 ++++++++++++++++++++++++++ lib/eal/include/rte_thread.h | 17 ++++++++++ lib/eal/version.map | 1 + lib/eal/windows/rte_thread.c | 66 ++++++++++++++++++++++++++++++++++++ 4 files changed, 133 insertions(+) diff --git a/lib/eal/common/rte_thread.c b/lib/eal/common/rte_thread.c index 73b7b3141c..fcebf7097c 100644 --- a/lib/eal/common/rte_thread.c +++ b/lib/eal/common/rte_thread.c @@ -50,6 +50,55 @@ rte_thread_get_affinity_by_id(rte_thread_t thread_id, sizeof(*cpuset), cpuset); } +static int +thread_map_priority_to_os_value(enum rte_thread_priority eal_pri, + int *os_pri, int *pol) +{ + /* Clear the output parameters */ + *os_pri = sched_get_priority_min(SCHED_OTHER) - 1; + *pol = -1; + + switch (eal_pri) { + case RTE_THREAD_PRIORITY_NORMAL: + *pol = SCHED_OTHER; + + /* + * Choose the middle of the range to represent + * the priority 'normal'. + * On Linux, this should be 0, since both + * sched_get_priority_min/_max return 0 for SCHED_OTHER. + */ + *os_pri = (sched_get_priority_min(SCHED_OTHER) + + sched_get_priority_max(SCHED_OTHER))/2; + break; + case RTE_THREAD_PRIORITY_REALTIME_CRITICAL: + *pol = SCHED_RR; + *os_pri = sched_get_priority_max(SCHED_RR); + break; + default: + RTE_LOG(DEBUG, EAL, "The requested priority value is invalid.\n"); + return EINVAL; + } + return 0; +} + +int +rte_thread_set_priority(rte_thread_t thread_id, + enum rte_thread_priority priority) +{ + int ret; + int policy; + struct sched_param param; + + ret = thread_map_priority_to_os_value(priority, ¶m.sched_priority, + &policy); + if (ret != 0) + return ret; + + return pthread_setschedparam((pthread_t)thread_id.opaque_id, + policy, ¶m); +} + int rte_thread_attr_init(rte_thread_attr_t *attr) { diff --git a/lib/eal/include/rte_thread.h b/lib/eal/include/rte_thread.h index 5b100cafda..a9cb6ec81c 100644 --- a/lib/eal/include/rte_thread.h +++ b/lib/eal/include/rte_thread.h @@ -213,6 +213,23 @@ void rte_thread_get_affinity(rte_cpuset_t *cpusetp); #endif /* RTE_HAS_CPUSET */ +/** + * Set the priority of a thread. + * + * @param thread_id + * Id of the thread for which to set priority. + * + * @param priority + * Priority value to be set. + * + * @return + * On success, return 0. + * On failure, return a positive errno-style error number. + */ +__rte_experimental +int rte_thread_set_priority(rte_thread_t thread_id, + enum rte_thread_priority priority); + /** * Create a TLS data key visible to all threads in the process. * the created key is later used to get/set a value. diff --git a/lib/eal/version.map b/lib/eal/version.map index faf0361d37..790b5112fb 100644 --- a/lib/eal/version.map +++ b/lib/eal/version.map @@ -435,6 +435,7 @@ EXPERIMENTAL { rte_thread_attr_set_priority; rte_thread_get_affinity_by_id; rte_thread_set_affinity_by_id; + rte_thread_set_priority; }; INTERNAL { diff --git a/lib/eal/windows/rte_thread.c b/lib/eal/windows/rte_thread.c index 0127119f49..fb04718f58 100644 --- a/lib/eal/windows/rte_thread.c +++ b/lib/eal/windows/rte_thread.c @@ -200,6 +200,72 @@ rte_thread_get_affinity_by_id(rte_thread_t thread_id, return ret; } +static int +thread_map_priority_to_os_value(enum rte_thread_priority eal_pri, + int *os_pri, int *pri_class) +{ + /* Clear the output parameters */ + *os_pri = -1; + *pri_class = -1; + + switch (eal_pri) { + case RTE_THREAD_PRIORITY_NORMAL: + *pri_class = NORMAL_PRIORITY_CLASS; + *os_pri = THREAD_PRIORITY_NORMAL; + break; + case RTE_THREAD_PRIORITY_REALTIME_CRITICAL: + *pri_class = REALTIME_PRIORITY_CLASS; + *os_pri = THREAD_PRIORITY_TIME_CRITICAL; + break; + default: + RTE_LOG(DEBUG, EAL, "The requested priority value is invalid.\n"); + return EINVAL; + } + + return 0; +} + +int +rte_thread_set_priority(rte_thread_t thread_id, + enum rte_thread_priority priority) +{ + HANDLE thread_handle; + int priority_class; + int os_priority; + int ret = 0; + + thread_handle = OpenThread(THREAD_SET_INFORMATION | + THREAD_QUERY_INFORMATION, FALSE, + thread_id.opaque_id); + if (thread_handle == NULL) { + ret = thread_log_last_error("OpenThread()"); + goto cleanup; + } + + ret = thread_map_priority_to_os_value(priority, &os_priority, + &priority_class); + if (ret != 0) + goto cleanup; + + if (!SetPriorityClass(GetCurrentProcess(), priority_class)) { + ret = thread_log_last_error("SetPriorityClass()"); + goto cleanup; + } + + if (!SetThreadPriority(thread_handle, os_priority)) { + ret = thread_log_last_error("SetThreadPriority()"); + goto cleanup; + } + +cleanup: + if (thread_handle != NULL) { + CloseHandle(thread_handle); + thread_handle = NULL; + } + + return ret; +} + int rte_thread_attr_init(rte_thread_attr_t *attr) { -- 2.31.0.vfs.0.1