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 } 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_SHARE_CPUPOWER \ 133 | 1*SD_SHARE_PKG_RESOURCES \ 134 | 0*SD_SERIALIZE \ 135 , \ 136 .last_balance = jiffies, \ 137 .balance_interval = 1, \ 138 } 139 #endif 140 #endif /* CONFIG_SCHED_MC */ 141 142 /* Common values for CPUs */ 143 #ifndef SD_CPU_INIT 144 #define SD_CPU_INIT (struct sched_domain) { \ 145 .min_interval = 1, \ 146 .max_interval = 4, \ 147 .busy_factor = 64, \ 148 .imbalance_pct = 125, \ 149 .cache_nice_tries = 1, \ 150 .busy_idx = 2, \ 151 .idle_idx = 1, \ 152 .newidle_idx = 0, \ 153 .wake_idx = 0, \ 154 .forkexec_idx = 0, \ 155 \ 156 .flags = 1*SD_LOAD_BALANCE \ 157 | 1*SD_BALANCE_NEWIDLE \ 158 | 1*SD_BALANCE_EXEC \ 159 | 1*SD_BALANCE_FORK \ 160 | 0*SD_BALANCE_WAKE \ 161 | 1*SD_WAKE_AFFINE \ 162 | 0*SD_SHARE_CPUPOWER \ 163 | 0*SD_SHARE_PKG_RESOURCES \ 164 | 0*SD_SERIALIZE \ 165 | 1*SD_PREFER_SIBLING \ 166 , \ 167 .last_balance = jiffies, \ 168 .balance_interval = 1, \ 169 } 170 #endif 171 172 #ifdef CONFIG_SCHED_BOOK 173 #ifndef SD_BOOK_INIT 174 #error Please define an appropriate SD_BOOK_INIT in include/asm/topology.h!!! 175 #endif 176 #endif /* CONFIG_SCHED_BOOK */ 177 178 #ifdef CONFIG_USE_PERCPU_NUMA_NODE_ID 179 DECLARE_PER_CPU(int, numa_node); 180 181 #ifndef numa_node_id 182 /* Returns the number of the current Node. */ 183 static inline int numa_node_id(void) 184 { 185 return __this_cpu_read(numa_node); 186 } 187 #endif 188 189 #ifndef cpu_to_node 190 static inline int cpu_to_node(int cpu) 191 { 192 return per_cpu(numa_node, cpu); 193 } 194 #endif 195 196 #ifndef set_numa_node 197 static inline void set_numa_node(int node) 198 { 199 this_cpu_write(numa_node, node); 200 } 201 #endif 202 203 #ifndef set_cpu_numa_node 204 static inline void set_cpu_numa_node(int cpu, int node) 205 { 206 per_cpu(numa_node, cpu) = node; 207 } 208 #endif 209 210 #else /* !CONFIG_USE_PERCPU_NUMA_NODE_ID */ 211 212 /* Returns the number of the current Node. */ 213 #ifndef numa_node_id 214 static inline int numa_node_id(void) 215 { 216 return cpu_to_node(raw_smp_processor_id()); 217 } 218 #endif 219 220 #endif /* [!]CONFIG_USE_PERCPU_NUMA_NODE_ID */ 221 222 #ifdef CONFIG_HAVE_MEMORYLESS_NODES 223 224 /* 225 * N.B., Do NOT reference the '_numa_mem_' per cpu variable directly. 226 * It will not be defined when CONFIG_HAVE_MEMORYLESS_NODES is not defined. 227 * Use the accessor functions set_numa_mem(), numa_mem_id() and cpu_to_mem(). 228 */ 229 DECLARE_PER_CPU(int, _numa_mem_); 230 231 #ifndef set_numa_mem 232 static inline void set_numa_mem(int node) 233 { 234 this_cpu_write(_numa_mem_, node); 235 } 236 #endif 237 238 #ifndef numa_mem_id 239 /* Returns the number of the nearest Node with memory */ 240 static inline int numa_mem_id(void) 241 { 242 return __this_cpu_read(_numa_mem_); 243 } 244 #endif 245 246 #ifndef cpu_to_mem 247 static inline int cpu_to_mem(int cpu) 248 { 249 return per_cpu(_numa_mem_, cpu); 250 } 251 #endif 252 253 #ifndef set_cpu_numa_mem 254 static inline void set_cpu_numa_mem(int cpu, int node) 255 { 256 per_cpu(_numa_mem_, cpu) = node; 257 } 258 #endif 259 260 #else /* !CONFIG_HAVE_MEMORYLESS_NODES */ 261 262 #ifndef numa_mem_id 263 /* Returns the number of the nearest Node with memory */ 264 static inline int numa_mem_id(void) 265 { 266 return numa_node_id(); 267 } 268 #endif 269 270 #ifndef cpu_to_mem 271 static inline int cpu_to_mem(int cpu) 272 { 273 return cpu_to_node(cpu); 274 } 275 #endif 276 277 #endif /* [!]CONFIG_HAVE_MEMORYLESS_NODES */ 278 279 #ifndef topology_physical_package_id 280 #define topology_physical_package_id(cpu) ((void)(cpu), -1) 281 #endif 282 #ifndef topology_core_id 283 #define topology_core_id(cpu) ((void)(cpu), 0) 284 #endif 285 #ifndef topology_thread_cpumask 286 #define topology_thread_cpumask(cpu) cpumask_of(cpu) 287 #endif 288 #ifndef topology_core_cpumask 289 #define topology_core_cpumask(cpu) cpumask_of(cpu) 290 #endif 291 292 #endif /* _LINUX_TOPOLOGY_H */ 293