1 /* 2 * include/linux/topology.h 3 * 4 * Written by: Matthew Dobson, IBM Corporation 5 * 6 * Copyright (C) 2002, IBM Corp. 7 * 8 * All rights reserved. 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; either version 2 of the License, or 13 * (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, but 16 * WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or 18 * NON INFRINGEMENT. See the GNU General Public License for more 19 * details. 20 * 21 * You should have received a copy of the GNU General Public License 22 * along with this program; if not, write to the Free Software 23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 24 * 25 * Send feedback to <[email protected]> 26 */ 27 #ifndef _LINUX_TOPOLOGY_H 28 #define _LINUX_TOPOLOGY_H 29 30 #include <linux/cpumask.h> 31 #include <linux/bitops.h> 32 #include <linux/mmzone.h> 33 #include <linux/smp.h> 34 #include <asm/topology.h> 35 36 #ifndef node_has_online_mem 37 #define node_has_online_mem(nid) (1) 38 #endif 39 40 #ifndef nr_cpus_node 41 #define nr_cpus_node(node) cpumask_weight(cpumask_of_node(node)) 42 #endif 43 44 #define for_each_node_with_cpus(node) \ 45 for_each_online_node(node) \ 46 if (nr_cpus_node(node)) 47 48 int arch_update_cpu_topology(void); 49 50 /* Conform to ACPI 2.0 SLIT distance definitions */ 51 #define LOCAL_DISTANCE 10 52 #define REMOTE_DISTANCE 20 53 #ifndef node_distance 54 #define node_distance(from,to) ((from) == (to) ? LOCAL_DISTANCE : REMOTE_DISTANCE) 55 #endif 56 #ifndef RECLAIM_DISTANCE 57 /* 58 * If the distance between nodes in a system is larger than RECLAIM_DISTANCE 59 * (in whatever arch specific measurement units returned by node_distance()) 60 * then switch on zone reclaim on boot. 61 */ 62 #define RECLAIM_DISTANCE 20 63 #endif 64 #ifndef PENALTY_FOR_NODE_WITH_CPUS 65 #define PENALTY_FOR_NODE_WITH_CPUS (1) 66 #endif 67 68 /* 69 * Below are the 3 major initializers used in building sched_domains: 70 * SD_SIBLING_INIT, for SMT domains 71 * SD_CPU_INIT, for SMP domains 72 * SD_NODE_INIT, for NUMA domains 73 * 74 * Any architecture that cares to do any tuning to these values should do so 75 * by defining their own arch-specific initializer in include/asm/topology.h. 76 * A definition there will automagically override these default initializers 77 * and allow arch-specific performance tuning of sched_domains. 78 * (Only non-zero and non-null fields need be specified.) 79 */ 80 81 #ifdef CONFIG_SCHED_SMT 82 /* MCD - Do we really need this? It is always on if CONFIG_SCHED_SMT is, 83 * so can't we drop this in favor of CONFIG_SCHED_SMT? 84 */ 85 #define ARCH_HAS_SCHED_WAKE_IDLE 86 /* Common values for SMT siblings */ 87 #ifndef SD_SIBLING_INIT 88 #define SD_SIBLING_INIT (struct sched_domain) { \ 89 .min_interval = 1, \ 90 .max_interval = 2, \ 91 .busy_factor = 64, \ 92 .imbalance_pct = 110, \ 93 \ 94 .flags = 1*SD_LOAD_BALANCE \ 95 | 1*SD_BALANCE_NEWIDLE \ 96 | 1*SD_BALANCE_EXEC \ 97 | 1*SD_BALANCE_FORK \ 98 | 0*SD_BALANCE_WAKE \ 99 | 1*SD_WAKE_AFFINE \ 100 | 1*SD_SHARE_CPUPOWER \ 101 | 0*SD_POWERSAVINGS_BALANCE \ 102 | 0*SD_SHARE_PKG_RESOURCES \ 103 | 0*SD_SERIALIZE \ 104 | 0*SD_PREFER_SIBLING \ 105 , \ 106 .last_balance = jiffies, \ 107 .balance_interval = 1, \ 108 .smt_gain = 1178, /* 15% */ \ 109 } 110 #endif 111 #endif /* CONFIG_SCHED_SMT */ 112 113 #ifdef CONFIG_SCHED_MC 114 /* Common values for MC siblings. for now mostly derived from SD_CPU_INIT */ 115 #ifndef SD_MC_INIT 116 #define SD_MC_INIT (struct sched_domain) { \ 117 .min_interval = 1, \ 118 .max_interval = 4, \ 119 .busy_factor = 64, \ 120 .imbalance_pct = 125, \ 121 .cache_nice_tries = 1, \ 122 .busy_idx = 2, \ 123 .wake_idx = 0, \ 124 .forkexec_idx = 0, \ 125 \ 126 .flags = 1*SD_LOAD_BALANCE \ 127 | 1*SD_BALANCE_NEWIDLE \ 128 | 1*SD_BALANCE_EXEC \ 129 | 1*SD_BALANCE_FORK \ 130 | 0*SD_BALANCE_WAKE \ 131 | 1*SD_WAKE_AFFINE \ 132 | 0*SD_PREFER_LOCAL \ 133 | 0*SD_SHARE_CPUPOWER \ 134 | 1*SD_SHARE_PKG_RESOURCES \ 135 | 0*SD_SERIALIZE \ 136 | sd_balance_for_mc_power() \ 137 | sd_power_saving_flags() \ 138 , \ 139 .last_balance = jiffies, \ 140 .balance_interval = 1, \ 141 } 142 #endif 143 #endif /* CONFIG_SCHED_MC */ 144 145 /* Common values for CPUs */ 146 #ifndef SD_CPU_INIT 147 #define SD_CPU_INIT (struct sched_domain) { \ 148 .min_interval = 1, \ 149 .max_interval = 4, \ 150 .busy_factor = 64, \ 151 .imbalance_pct = 125, \ 152 .cache_nice_tries = 1, \ 153 .busy_idx = 2, \ 154 .idle_idx = 1, \ 155 .newidle_idx = 0, \ 156 .wake_idx = 0, \ 157 .forkexec_idx = 0, \ 158 \ 159 .flags = 1*SD_LOAD_BALANCE \ 160 | 1*SD_BALANCE_NEWIDLE \ 161 | 1*SD_BALANCE_EXEC \ 162 | 1*SD_BALANCE_FORK \ 163 | 0*SD_BALANCE_WAKE \ 164 | 1*SD_WAKE_AFFINE \ 165 | 0*SD_PREFER_LOCAL \ 166 | 0*SD_SHARE_CPUPOWER \ 167 | 0*SD_SHARE_PKG_RESOURCES \ 168 | 0*SD_SERIALIZE \ 169 | sd_balance_for_package_power() \ 170 | sd_power_saving_flags() \ 171 , \ 172 .last_balance = jiffies, \ 173 .balance_interval = 1, \ 174 } 175 #endif 176 177 /* sched_domains SD_ALLNODES_INIT for NUMA machines */ 178 #define SD_ALLNODES_INIT (struct sched_domain) { \ 179 .min_interval = 64, \ 180 .max_interval = 64*num_online_cpus(), \ 181 .busy_factor = 128, \ 182 .imbalance_pct = 133, \ 183 .cache_nice_tries = 1, \ 184 .busy_idx = 3, \ 185 .idle_idx = 3, \ 186 .flags = 1*SD_LOAD_BALANCE \ 187 | 1*SD_BALANCE_NEWIDLE \ 188 | 0*SD_BALANCE_EXEC \ 189 | 0*SD_BALANCE_FORK \ 190 | 0*SD_BALANCE_WAKE \ 191 | 0*SD_WAKE_AFFINE \ 192 | 0*SD_SHARE_CPUPOWER \ 193 | 0*SD_POWERSAVINGS_BALANCE \ 194 | 0*SD_SHARE_PKG_RESOURCES \ 195 | 1*SD_SERIALIZE \ 196 | 0*SD_PREFER_SIBLING \ 197 , \ 198 .last_balance = jiffies, \ 199 .balance_interval = 64, \ 200 } 201 202 #ifdef CONFIG_NUMA 203 #ifndef SD_NODE_INIT 204 #error Please define an appropriate SD_NODE_INIT in include/asm/topology.h!!! 205 #endif 206 #endif /* CONFIG_NUMA */ 207 208 #ifndef topology_physical_package_id 209 #define topology_physical_package_id(cpu) ((void)(cpu), -1) 210 #endif 211 #ifndef topology_core_id 212 #define topology_core_id(cpu) ((void)(cpu), 0) 213 #endif 214 #ifndef topology_thread_cpumask 215 #define topology_thread_cpumask(cpu) cpumask_of(cpu) 216 #endif 217 #ifndef topology_core_cpumask 218 #define topology_core_cpumask(cpu) cpumask_of(cpu) 219 #endif 220 221 /* Returns the number of the current Node. */ 222 #ifndef numa_node_id 223 #define numa_node_id() (cpu_to_node(raw_smp_processor_id())) 224 #endif 225 226 #endif /* _LINUX_TOPOLOGY_H */ 227