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 20 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 * SD_NODE_INIT, for NUMA domains 74 * 75 * Any architecture that cares to do any tuning to these values should do so 76 * by defining their own arch-specific initializer in include/asm/topology.h. 77 * A definition there will automagically override these default initializers 78 * and allow arch-specific performance tuning of sched_domains. 79 * (Only non-zero and non-null fields need be specified.) 80 */ 81 82 #ifdef CONFIG_SCHED_SMT 83 /* MCD - Do we really need this? It is always on if CONFIG_SCHED_SMT is, 84 * so can't we drop this in favor of CONFIG_SCHED_SMT? 85 */ 86 #define ARCH_HAS_SCHED_WAKE_IDLE 87 /* Common values for SMT siblings */ 88 #ifndef SD_SIBLING_INIT 89 #define SD_SIBLING_INIT (struct sched_domain) { \ 90 .min_interval = 1, \ 91 .max_interval = 2, \ 92 .busy_factor = 64, \ 93 .imbalance_pct = 110, \ 94 \ 95 .flags = 1*SD_LOAD_BALANCE \ 96 | 1*SD_BALANCE_NEWIDLE \ 97 | 1*SD_BALANCE_EXEC \ 98 | 1*SD_BALANCE_FORK \ 99 | 0*SD_BALANCE_WAKE \ 100 | 1*SD_WAKE_AFFINE \ 101 | 1*SD_SHARE_CPUPOWER \ 102 | 0*SD_POWERSAVINGS_BALANCE \ 103 | 1*SD_SHARE_PKG_RESOURCES \ 104 | 0*SD_SERIALIZE \ 105 | 0*SD_PREFER_SIBLING \ 106 | arch_sd_sibling_asym_packing() \ 107 , \ 108 .last_balance = jiffies, \ 109 .balance_interval = 1, \ 110 .smt_gain = 1178, /* 15% */ \ 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_PREFER_LOCAL \ 135 | 0*SD_SHARE_CPUPOWER \ 136 | 1*SD_SHARE_PKG_RESOURCES \ 137 | 0*SD_SERIALIZE \ 138 | sd_balance_for_mc_power() \ 139 | sd_power_saving_flags() \ 140 , \ 141 .last_balance = jiffies, \ 142 .balance_interval = 1, \ 143 } 144 #endif 145 #endif /* CONFIG_SCHED_MC */ 146 147 /* Common values for CPUs */ 148 #ifndef SD_CPU_INIT 149 #define SD_CPU_INIT (struct sched_domain) { \ 150 .min_interval = 1, \ 151 .max_interval = 4, \ 152 .busy_factor = 64, \ 153 .imbalance_pct = 125, \ 154 .cache_nice_tries = 1, \ 155 .busy_idx = 2, \ 156 .idle_idx = 1, \ 157 .newidle_idx = 0, \ 158 .wake_idx = 0, \ 159 .forkexec_idx = 0, \ 160 \ 161 .flags = 1*SD_LOAD_BALANCE \ 162 | 1*SD_BALANCE_NEWIDLE \ 163 | 1*SD_BALANCE_EXEC \ 164 | 1*SD_BALANCE_FORK \ 165 | 0*SD_BALANCE_WAKE \ 166 | 1*SD_WAKE_AFFINE \ 167 | 0*SD_PREFER_LOCAL \ 168 | 0*SD_SHARE_CPUPOWER \ 169 | 0*SD_SHARE_PKG_RESOURCES \ 170 | 0*SD_SERIALIZE \ 171 | sd_balance_for_package_power() \ 172 | sd_power_saving_flags() \ 173 , \ 174 .last_balance = jiffies, \ 175 .balance_interval = 1, \ 176 } 177 #endif 178 179 /* sched_domains SD_ALLNODES_INIT for NUMA machines */ 180 #define SD_ALLNODES_INIT (struct sched_domain) { \ 181 .min_interval = 64, \ 182 .max_interval = 64*num_online_cpus(), \ 183 .busy_factor = 128, \ 184 .imbalance_pct = 133, \ 185 .cache_nice_tries = 1, \ 186 .busy_idx = 3, \ 187 .idle_idx = 3, \ 188 .flags = 1*SD_LOAD_BALANCE \ 189 | 1*SD_BALANCE_NEWIDLE \ 190 | 0*SD_BALANCE_EXEC \ 191 | 0*SD_BALANCE_FORK \ 192 | 0*SD_BALANCE_WAKE \ 193 | 0*SD_WAKE_AFFINE \ 194 | 0*SD_SHARE_CPUPOWER \ 195 | 0*SD_POWERSAVINGS_BALANCE \ 196 | 0*SD_SHARE_PKG_RESOURCES \ 197 | 1*SD_SERIALIZE \ 198 | 0*SD_PREFER_SIBLING \ 199 , \ 200 .last_balance = jiffies, \ 201 .balance_interval = 64, \ 202 } 203 204 #ifdef CONFIG_NUMA 205 #ifndef SD_NODE_INIT 206 #error Please define an appropriate SD_NODE_INIT in include/asm/topology.h!!! 207 #endif 208 209 #endif /* CONFIG_NUMA */ 210 211 #ifdef CONFIG_USE_PERCPU_NUMA_NODE_ID 212 DECLARE_PER_CPU(int, numa_node); 213 214 #ifndef numa_node_id 215 /* Returns the number of the current Node. */ 216 static inline int numa_node_id(void) 217 { 218 return __this_cpu_read(numa_node); 219 } 220 #endif 221 222 #ifndef cpu_to_node 223 static inline int cpu_to_node(int cpu) 224 { 225 return per_cpu(numa_node, cpu); 226 } 227 #endif 228 229 #ifndef set_numa_node 230 static inline void set_numa_node(int node) 231 { 232 percpu_write(numa_node, node); 233 } 234 #endif 235 236 #ifndef set_cpu_numa_node 237 static inline void set_cpu_numa_node(int cpu, int node) 238 { 239 per_cpu(numa_node, cpu) = node; 240 } 241 #endif 242 243 #else /* !CONFIG_USE_PERCPU_NUMA_NODE_ID */ 244 245 /* Returns the number of the current Node. */ 246 #ifndef numa_node_id 247 static inline int numa_node_id(void) 248 { 249 return cpu_to_node(raw_smp_processor_id()); 250 } 251 #endif 252 253 #endif /* [!]CONFIG_USE_PERCPU_NUMA_NODE_ID */ 254 255 #ifdef CONFIG_HAVE_MEMORYLESS_NODES 256 257 /* 258 * N.B., Do NOT reference the '_numa_mem_' per cpu variable directly. 259 * It will not be defined when CONFIG_HAVE_MEMORYLESS_NODES is not defined. 260 * Use the accessor functions set_numa_mem(), numa_mem_id() and cpu_to_mem(). 261 */ 262 DECLARE_PER_CPU(int, _numa_mem_); 263 264 #ifndef set_numa_mem 265 static inline void set_numa_mem(int node) 266 { 267 percpu_write(_numa_mem_, node); 268 } 269 #endif 270 271 #ifndef numa_mem_id 272 /* Returns the number of the nearest Node with memory */ 273 static inline int numa_mem_id(void) 274 { 275 return __this_cpu_read(_numa_mem_); 276 } 277 #endif 278 279 #ifndef cpu_to_mem 280 static inline int cpu_to_mem(int cpu) 281 { 282 return per_cpu(_numa_mem_, cpu); 283 } 284 #endif 285 286 #ifndef set_cpu_numa_mem 287 static inline void set_cpu_numa_mem(int cpu, int node) 288 { 289 per_cpu(_numa_mem_, cpu) = node; 290 } 291 #endif 292 293 #else /* !CONFIG_HAVE_MEMORYLESS_NODES */ 294 295 #ifndef numa_mem_id 296 /* Returns the number of the nearest Node with memory */ 297 static inline int numa_mem_id(void) 298 { 299 return numa_node_id(); 300 } 301 #endif 302 303 #ifndef cpu_to_mem 304 static inline int cpu_to_mem(int cpu) 305 { 306 return cpu_to_node(cpu); 307 } 308 #endif 309 310 #endif /* [!]CONFIG_HAVE_MEMORYLESS_NODES */ 311 312 #ifndef topology_physical_package_id 313 #define topology_physical_package_id(cpu) ((void)(cpu), -1) 314 #endif 315 #ifndef topology_core_id 316 #define topology_core_id(cpu) ((void)(cpu), 0) 317 #endif 318 #ifndef topology_thread_cpumask 319 #define topology_thread_cpumask(cpu) cpumask_of(cpu) 320 #endif 321 #ifndef topology_core_cpumask 322 #define topology_core_cpumask(cpu) cpumask_of(cpu) 323 #endif 324 325 #endif /* _LINUX_TOPOLOGY_H */ 326