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Miller" , Saeed Mahameed , Jakub Kicinski , Ingo Molnar , Peter Zijlstra , Juri Lelli CC: Eric Dumazet , Paolo Abeni , , Gal Pressman , Vincent Guittot , , Tariq Toukan Subject: [PATCH net-next V4 1/3] sched/topology: Add NUMA-based CPUs spread API Date: Thu, 28 Jul 2022 22:12:01 +0300 Message-ID: <20220728191203.4055-2-tariqt@nvidia.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20220728191203.4055-1-tariqt@nvidia.com> References: <20220728191203.4055-1-tariqt@nvidia.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 6a2db83c-5065-4027-ab34-08da70cd1794 X-MS-TrafficTypeDiagnostic: MN0PR12MB6176:EE_ X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:12.22.5.235;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:InfoNoRecords;CAT:NONE;SFS:(13230016)(4636009)(136003)(396003)(346002)(376002)(39860400002)(46966006)(40470700004)(36840700001)(82740400003)(47076005)(26005)(70206006)(356005)(81166007)(82310400005)(41300700001)(8676002)(6666004)(316002)(2906002)(70586007)(1076003)(83380400001)(7416002)(40460700003)(2616005)(7696005)(4326008)(478600001)(86362001)(36860700001)(336012)(8936002)(5660300002)(107886003)(40480700001)(426003)(54906003)(110136005)(36756003)(186003)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 28 Jul 2022 19:12:19.1478 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 6a2db83c-5065-4027-ab34-08da70cd1794 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[12.22.5.235];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CO1NAM11FT068.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN0PR12MB6176 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Implement and expose API that sets the spread of CPUs based on distance, given a NUMA node. Fallback to legacy logic that uses cpumask_local_spread. This logic can be used by device drivers to prefer some remote cpus over others. Reviewed-by: Gal Pressman Signed-off-by: Tariq Toukan --- include/linux/sched/topology.h | 5 ++++ kernel/sched/topology.c | 49 ++++++++++++++++++++++++++++++++++ 2 files changed, 54 insertions(+) diff --git a/include/linux/sched/topology.h b/include/linux/sched/topology.h index 56cffe42abbc..a49167c2a0e5 100644 --- a/include/linux/sched/topology.h +++ b/include/linux/sched/topology.h @@ -210,6 +210,7 @@ extern void set_sched_topology(struct sched_domain_topology_level *tl); # define SD_INIT_NAME(type) #endif +void sched_cpus_set_spread(int node, u16 *cpus, int ncpus); #else /* CONFIG_SMP */ struct sched_domain_attr; @@ -231,6 +232,10 @@ static inline bool cpus_share_cache(int this_cpu, int that_cpu) return true; } +static inline void sched_cpus_set_spread(int node, u16 *cpus, int ncpus) +{ + memset(cpus, 0, ncpus * sizeof(*cpus)); +} #endif /* !CONFIG_SMP */ #if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL) diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c index 05b6c2ad90b9..157aef862c04 100644 --- a/kernel/sched/topology.c +++ b/kernel/sched/topology.c @@ -2067,8 +2067,57 @@ int sched_numa_find_closest(const struct cpumask *cpus, int cpu) return found; } +static bool sched_cpus_spread_by_distance(int node, u16 *cpus, int ncpus) +{ + cpumask_var_t cpumask; + int first, i; + + if (!zalloc_cpumask_var(&cpumask, GFP_KERNEL)) + return false; + + cpumask_copy(cpumask, cpu_online_mask); + + first = cpumask_first(cpumask_of_node(node)); + + for (i = 0; i < ncpus; i++) { + int cpu; + + cpu = sched_numa_find_closest(cpumask, first); + if (cpu >= nr_cpu_ids) { + free_cpumask_var(cpumask); + return false; + } + cpus[i] = cpu; + __cpumask_clear_cpu(cpu, cpumask); + } + + free_cpumask_var(cpumask); + return true; +} +#else +static bool sched_cpus_spread_by_distance(int node, u16 *cpus, int ncpus) +{ + return false; +} #endif /* CONFIG_NUMA */ +static void sched_cpus_by_local_spread(int node, u16 *cpus, int ncpus) +{ + int i; + + for (i = 0; i < ncpus; i++) + cpus[i] = cpumask_local_spread(i, node); +} + +void sched_cpus_set_spread(int node, u16 *cpus, int ncpus) +{ + bool success = sched_cpus_spread_by_distance(node, cpus, ncpus); + + if (!success) + sched_cpus_by_local_spread(node, cpus, ncpus); +} +EXPORT_SYMBOL_GPL(sched_cpus_set_spread); + static int __sdt_alloc(const struct cpumask *cpu_map) { struct sched_domain_topology_level *tl; -- 2.21.0