/* * include/linux/topology.h * * Written by: Matthew Dobson, IBM Corporation * * Copyright (C) 2002, IBM Corp. * * All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or * NON INFRINGEMENT. See the GNU General Public License for more * details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * * Send feedback to */ #ifndef _LINUX_TOPOLOGY_H #define _LINUX_TOPOLOGY_H #include #include #include #include #include #include #ifndef node_has_online_mem #define node_has_online_mem(nid) (1) #endif #ifndef nr_cpus_node #define nr_cpus_node(node) cpumask_weight(cpumask_of_node(node)) #endif #define for_each_node_with_cpus(node) \ for_each_online_node(node) \ if (nr_cpus_node(node)) int arch_update_cpu_topology(void); /* Conform to ACPI 2.0 SLIT distance definitions */ #define LOCAL_DISTANCE 10 #define REMOTE_DISTANCE 20 #ifndef node_distance #define node_distance(from,to) ((from) == (to) ? LOCAL_DISTANCE : REMOTE_DISTANCE) #endif #ifndef RECLAIM_DISTANCE /* * If the distance between nodes in a system is larger than RECLAIM_DISTANCE * (in whatever arch specific measurement units returned by node_distance()) * then switch on zone reclaim on boot. */ #define RECLAIM_DISTANCE 30 #endif #ifndef PENALTY_FOR_NODE_WITH_CPUS #define PENALTY_FOR_NODE_WITH_CPUS (1) #endif /* * Below are the 3 major initializers used in building sched_domains: * SD_SIBLING_INIT, for SMT domains * SD_CPU_INIT, for SMP domains * SD_NODE_INIT, for NUMA domains * * Any architecture that cares to do any tuning to these values should do so * by defining their own arch-specific initializer in include/asm/topology.h. * A definition there will automagically override these default initializers * and allow arch-specific performance tuning of sched_domains. * (Only non-zero and non-null fields need be specified.) */ #ifdef CONFIG_SCHED_SMT /* MCD - Do we really need this? It is always on if CONFIG_SCHED_SMT is, * so can't we drop this in favor of CONFIG_SCHED_SMT? */ #define ARCH_HAS_SCHED_WAKE_IDLE /* Common values for SMT siblings */ #ifndef SD_SIBLING_INIT #define SD_SIBLING_INIT (struct sched_domain) { \ .min_interval = 1, \ .max_interval = 2, \ .busy_factor = 64, \ .imbalance_pct = 110, \ \ .flags = 1*SD_LOAD_BALANCE \ | 1*SD_BALANCE_NEWIDLE \ | 1*SD_BALANCE_EXEC \ | 1*SD_BALANCE_FORK \ | 0*SD_BALANCE_WAKE \ | 1*SD_WAKE_AFFINE \ | 1*SD_SHARE_CPUPOWER \ | 0*SD_POWERSAVINGS_BALANCE \ | 1*SD_SHARE_PKG_RESOURCES \ | 0*SD_SERIALIZE \ | 0*SD_PREFER_SIBLING \ | arch_sd_sibling_asym_packing() \ , \ .last_balance = jiffies, \ .balance_interval = 1, \ .smt_gain = 1178, /* 15% */ \ } #endif #endif /* CONFIG_SCHED_SMT */ #ifdef CONFIG_SCHED_MC /* Common values for MC siblings. for now mostly derived from SD_CPU_INIT */ #ifndef SD_MC_INIT #define SD_MC_INIT (struct sched_domain) { \ .min_interval = 1, \ .max_interval = 4, \ .busy_factor = 1, \ .imbalance_pct = 125, \ .cache_nice_tries = 1, \ .busy_idx = 2, \ .wake_idx = 0, \ .forkexec_idx = 0, \ \ .flags = 1*SD_LOAD_BALANCE \ | 1*SD_BALANCE_NEWIDLE \ | 1*SD_BALANCE_EXEC \ | 1*SD_BALANCE_FORK \ | 0*SD_BALANCE_WAKE \ | 1*SD_WAKE_AFFINE \ | 0*SD_PREFER_LOCAL \ | 0*SD_SHARE_CPUPOWER \ | 1*SD_SHARE_PKG_RESOURCES \ | 0*SD_SERIALIZE \ | sd_balance_for_mc_power() \ | sd_power_saving_flags() \ , \ .last_balance = jiffies, \ .balance_interval = 1, \ } #endif #endif /* CONFIG_SCHED_MC */ /* Common values for CPUs */ #ifndef SD_CPU_INIT #define SD_CPU_INIT (struct sched_domain) { \ .min_interval = 1, \ .max_interval = 4, \ .busy_factor = 64, \ .imbalance_pct = 125, \ .cache_nice_tries = 1, \ .busy_idx = 2, \ .idle_idx = 1, \ .newidle_idx = 0, \ .wake_idx = 0, \ .forkexec_idx = 0, \ \ .flags = 1*SD_LOAD_BALANCE \ | 1*SD_BALANCE_NEWIDLE \ | 1*SD_BALANCE_EXEC \ | 1*SD_BALANCE_FORK \ | 0*SD_BALANCE_WAKE \ | 1*SD_WAKE_AFFINE \ | 0*SD_PREFER_LOCAL \ | 0*SD_SHARE_CPUPOWER \ | 1*SD_SHARE_PKG_RESOURCES \ | 0*SD_SERIALIZE \ | sd_balance_for_package_power() \ | sd_power_saving_flags() \ , \ .last_balance = jiffies, \ .balance_interval = 1, \ } #endif /* sched_domains SD_ALLNODES_INIT for NUMA machines */ #define SD_ALLNODES_INIT (struct sched_domain) { \ .min_interval = 64, \ .max_interval = 64*num_online_cpus(), \ .busy_factor = 128, \ .imbalance_pct = 133, \ .cache_nice_tries = 1, \ .busy_idx = 3, \ .idle_idx = 3, \ .flags = 1*SD_LOAD_BALANCE \ | 1*SD_BALANCE_NEWIDLE \ | 0*SD_BALANCE_EXEC \ | 0*SD_BALANCE_FORK \ | 0*SD_BALANCE_WAKE \ | 0*SD_WAKE_AFFINE \ | 0*SD_SHARE_CPUPOWER \ | 0*SD_POWERSAVINGS_BALANCE \ | 0*SD_SHARE_PKG_RESOURCES \ | 1*SD_SERIALIZE \ | 0*SD_PREFER_SIBLING \ , \ .last_balance = jiffies, \ .balance_interval = 64, \ } #ifndef SD_NODES_PER_DOMAIN #define SD_NODES_PER_DOMAIN 16 #endif #ifdef CONFIG_SCHED_BOOK #ifndef SD_BOOK_INIT #error Please define an appropriate SD_BOOK_INIT in include/asm/topology.h!!! #endif #endif /* CONFIG_SCHED_BOOK */ #ifdef CONFIG_NUMA #ifndef SD_NODE_INIT #error Please define an appropriate SD_NODE_INIT in include/asm/topology.h!!! #endif #endif /* CONFIG_NUMA */ #ifdef CONFIG_USE_PERCPU_NUMA_NODE_ID DECLARE_PER_CPU(int, numa_node); #ifndef numa_node_id /* Returns the number of the current Node. */ static inline int numa_node_id(void) { return __this_cpu_read(numa_node); } #endif #ifndef cpu_to_node static inline int cpu_to_node(int cpu) { return per_cpu(numa_node, cpu); } #endif #ifndef set_numa_node static inline void set_numa_node(int node) { percpu_write(numa_node, node); } #endif #ifndef set_cpu_numa_node static inline void set_cpu_numa_node(int cpu, int node) { per_cpu(numa_node, cpu) = node; } #endif #else /* !CONFIG_USE_PERCPU_NUMA_NODE_ID */ /* Returns the number of the current Node. */ #ifndef numa_node_id static inline int numa_node_id(void) { return cpu_to_node(raw_smp_processor_id()); } #endif #endif /* [!]CONFIG_USE_PERCPU_NUMA_NODE_ID */ #ifdef CONFIG_HAVE_MEMORYLESS_NODES /* * N.B., Do NOT reference the '_numa_mem_' per cpu variable directly. * It will not be defined when CONFIG_HAVE_MEMORYLESS_NODES is not defined. * Use the accessor functions set_numa_mem(), numa_mem_id() and cpu_to_mem(). */ DECLARE_PER_CPU(int, _numa_mem_); #ifndef set_numa_mem static inline void set_numa_mem(int node) { percpu_write(_numa_mem_, node); } #endif #ifndef numa_mem_id /* Returns the number of the nearest Node with memory */ static inline int numa_mem_id(void) { return __this_cpu_read(_numa_mem_); } #endif #ifndef cpu_to_mem static inline int cpu_to_mem(int cpu) { return per_cpu(_numa_mem_, cpu); } #endif #ifndef set_cpu_numa_mem static inline void set_cpu_numa_mem(int cpu, int node) { per_cpu(_numa_mem_, cpu) = node; } #endif #else /* !CONFIG_HAVE_MEMORYLESS_NODES */ #ifndef numa_mem_id /* Returns the number of the nearest Node with memory */ static inline int numa_mem_id(void) { return numa_node_id(); } #endif #ifndef cpu_to_mem static inline int cpu_to_mem(int cpu) { return cpu_to_node(cpu); } #endif #endif /* [!]CONFIG_HAVE_MEMORYLESS_NODES */ #ifndef topology_physical_package_id #define topology_physical_package_id(cpu) ((void)(cpu), -1) #endif #ifndef topology_core_id #define topology_core_id(cpu) ((void)(cpu), 0) #endif #ifndef topology_thread_cpumask #define topology_thread_cpumask(cpu) cpumask_of(cpu) #endif #ifndef topology_core_cpumask #define topology_core_cpumask(cpu) cpumask_of(cpu) #endif #endif /* _LINUX_TOPOLOGY_H */