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 <linux/percpu.h> 35 #include <asm/topology.h> 36 37 #ifndef node_has_online_mem 38 #define node_has_online_mem(nid) (1) 39 #endif 40 41 #ifndef nr_cpus_node 42 #define nr_cpus_node(node) cpumask_weight(cpumask_of_node(node)) 43 #endif 44 45 #define for_each_node_with_cpus(node) \ 46 for_each_online_node(node) \ 47 if (nr_cpus_node(node)) 48 49 int arch_update_cpu_topology(void); 50 51 /* Conform to ACPI 2.0 SLIT distance definitions */ 52 #define LOCAL_DISTANCE 10 53 #define REMOTE_DISTANCE 20 54 #ifndef node_distance 55 #define node_distance(from,to) ((from) == (to) ? LOCAL_DISTANCE : REMOTE_DISTANCE) 56 #endif 57 #ifndef RECLAIM_DISTANCE 58 /* 59 * If the distance between nodes in a system is larger than RECLAIM_DISTANCE 60 * (in whatever arch specific measurement units returned by node_distance()) 61 * then switch on zone reclaim on boot. 62 */ 63 #define RECLAIM_DISTANCE 30 64 #endif 65 #ifndef PENALTY_FOR_NODE_WITH_CPUS 66 #define PENALTY_FOR_NODE_WITH_CPUS (1) 67 #endif 68 69 /* 70 * Below are the 3 major initializers used in building sched_domains: 71 * SD_SIBLING_INIT, for SMT domains 72 * SD_CPU_INIT, for SMP 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 | 1*SD_SHARE_PKG_RESOURCES \ 102 | 0*SD_SERIALIZE \ 103 | 0*SD_PREFER_SIBLING \ 104 | arch_sd_sibling_asym_packing() \ 105 , \ 106 .last_balance = jiffies, \ 107 .balance_interval = 1, \ 108 .smt_gain = 1178, /* 15% */ \ 109 .max_newidle_lb_cost = 0, \ 110 .next_decay_max_lb_cost = jiffies, \ 111 } 112 #endif 113 #endif /* CONFIG_SCHED_SMT */ 114 115 #ifdef CONFIG_SCHED_MC 116 /* Common values for MC siblings. for now mostly derived from SD_CPU_INIT */ 117 #ifndef SD_MC_INIT 118 #define SD_MC_INIT (struct sched_domain) { \ 119 .min_interval = 1, \ 120 .max_interval = 4, \ 121 .busy_factor = 64, \ 122 .imbalance_pct = 125, \ 123 .cache_nice_tries = 1, \ 124 .busy_idx = 2, \ 125 .wake_idx = 0, \ 126 .forkexec_idx = 0, \ 127 \ 128 .flags = 1*SD_LOAD_BALANCE \ 129 | 1*SD_BALANCE_NEWIDLE \ 130 | 1*SD_BALANCE_EXEC \ 131 | 1*SD_BALANCE_FORK \ 132 | 0*SD_BALANCE_WAKE \ 133 | 1*SD_WAKE_AFFINE \ 134 | 0*SD_SHARE_CPUPOWER \ 135 | 1*SD_SHARE_PKG_RESOURCES \ 136 | 0*SD_SERIALIZE \ 137 , \ 138 .last_balance = jiffies, \ 139 .balance_interval = 1, \ 140 .max_newidle_lb_cost = 0, \ 141 .next_decay_max_lb_cost = jiffies, \ 142 } 143 #endif 144 #endif /* CONFIG_SCHED_MC */ 145 146 /* Common values for CPUs */ 147 #ifndef SD_CPU_INIT 148 #define SD_CPU_INIT (struct sched_domain) { \ 149 .min_interval = 1, \ 150 .max_interval = 4, \ 151 .busy_factor = 64, \ 152 .imbalance_pct = 125, \ 153 .cache_nice_tries = 1, \ 154 .busy_idx = 2, \ 155 .idle_idx = 1, \ 156 .newidle_idx = 0, \ 157 .wake_idx = 0, \ 158 .forkexec_idx = 0, \ 159 \ 160 .flags = 1*SD_LOAD_BALANCE \ 161 | 1*SD_BALANCE_NEWIDLE \ 162 | 1*SD_BALANCE_EXEC \ 163 | 1*SD_BALANCE_FORK \ 164 | 0*SD_BALANCE_WAKE \ 165 | 1*SD_WAKE_AFFINE \ 166 | 0*SD_SHARE_CPUPOWER \ 167 | 0*SD_SHARE_PKG_RESOURCES \ 168 | 0*SD_SERIALIZE \ 169 | 1*SD_PREFER_SIBLING \ 170 , \ 171 .last_balance = jiffies, \ 172 .balance_interval = 1, \ 173 .max_newidle_lb_cost = 0, \ 174 .next_decay_max_lb_cost = jiffies, \ 175 } 176 #endif 177 178 #ifdef CONFIG_SCHED_BOOK 179 #ifndef SD_BOOK_INIT 180 #error Please define an appropriate SD_BOOK_INIT in include/asm/topology.h!!! 181 #endif 182 #endif /* CONFIG_SCHED_BOOK */ 183 184 #ifdef CONFIG_USE_PERCPU_NUMA_NODE_ID 185 DECLARE_PER_CPU(int, numa_node); 186 187 #ifndef numa_node_id 188 /* Returns the number of the current Node. */ 189 static inline int numa_node_id(void) 190 { 191 return raw_cpu_read(numa_node); 192 } 193 #endif 194 195 #ifndef cpu_to_node 196 static inline int cpu_to_node(int cpu) 197 { 198 return per_cpu(numa_node, cpu); 199 } 200 #endif 201 202 #ifndef set_numa_node 203 static inline void set_numa_node(int node) 204 { 205 this_cpu_write(numa_node, node); 206 } 207 #endif 208 209 #ifndef set_cpu_numa_node 210 static inline void set_cpu_numa_node(int cpu, int node) 211 { 212 per_cpu(numa_node, cpu) = node; 213 } 214 #endif 215 216 #else /* !CONFIG_USE_PERCPU_NUMA_NODE_ID */ 217 218 /* Returns the number of the current Node. */ 219 #ifndef numa_node_id 220 static inline int numa_node_id(void) 221 { 222 return cpu_to_node(raw_smp_processor_id()); 223 } 224 #endif 225 226 #endif /* [!]CONFIG_USE_PERCPU_NUMA_NODE_ID */ 227 228 #ifdef CONFIG_HAVE_MEMORYLESS_NODES 229 230 /* 231 * N.B., Do NOT reference the '_numa_mem_' per cpu variable directly. 232 * It will not be defined when CONFIG_HAVE_MEMORYLESS_NODES is not defined. 233 * Use the accessor functions set_numa_mem(), numa_mem_id() and cpu_to_mem(). 234 */ 235 DECLARE_PER_CPU(int, _numa_mem_); 236 237 #ifndef set_numa_mem 238 static inline void set_numa_mem(int node) 239 { 240 this_cpu_write(_numa_mem_, node); 241 } 242 #endif 243 244 #ifndef numa_mem_id 245 /* Returns the number of the nearest Node with memory */ 246 static inline int numa_mem_id(void) 247 { 248 return raw_cpu_read(_numa_mem_); 249 } 250 #endif 251 252 #ifndef cpu_to_mem 253 static inline int cpu_to_mem(int cpu) 254 { 255 return per_cpu(_numa_mem_, cpu); 256 } 257 #endif 258 259 #ifndef set_cpu_numa_mem 260 static inline void set_cpu_numa_mem(int cpu, int node) 261 { 262 per_cpu(_numa_mem_, cpu) = node; 263 } 264 #endif 265 266 #else /* !CONFIG_HAVE_MEMORYLESS_NODES */ 267 268 #ifndef numa_mem_id 269 /* Returns the number of the nearest Node with memory */ 270 static inline int numa_mem_id(void) 271 { 272 return numa_node_id(); 273 } 274 #endif 275 276 #ifndef cpu_to_mem 277 static inline int cpu_to_mem(int cpu) 278 { 279 return cpu_to_node(cpu); 280 } 281 #endif 282 283 #endif /* [!]CONFIG_HAVE_MEMORYLESS_NODES */ 284 285 #ifndef topology_physical_package_id 286 #define topology_physical_package_id(cpu) ((void)(cpu), -1) 287 #endif 288 #ifndef topology_core_id 289 #define topology_core_id(cpu) ((void)(cpu), 0) 290 #endif 291 #ifndef topology_thread_cpumask 292 #define topology_thread_cpumask(cpu) cpumask_of(cpu) 293 #endif 294 #ifndef topology_core_cpumask 295 #define topology_core_cpumask(cpu) cpumask_of(cpu) 296 #endif 297 298 #endif /* _LINUX_TOPOLOGY_H */ 299