include/linux/topology.h

   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 <colpatch@us.ibm.com>
  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                                 ,                                       \
 107         .last_balance           = jiffies,                              \
 108         .balance_interval       = 1,                                    \
 109         .smt_gain               = 1178, /* 15% */                       \
 110 }
 111 #endif
 112 #endif /* CONFIG_SCHED_SMT */
 113
 114 #ifdef CONFIG_SCHED_MC
 115 /* Common values for MC siblings. for now mostly derived from SD_CPU_INIT */
 116 #ifndef SD_MC_INIT
 117 #define SD_MC_INIT (struct sched_domain) {                              \
 118         .min_interval           = 1,                                    \
 119         .max_interval           = 4,                                    \
 120         .busy_factor            = 64,                                   \
 121         .imbalance_pct          = 125,                                  \
 122         .cache_nice_tries       = 1,                                    \
 123         .busy_idx               = 2,                                    \
 124         .wake_idx               = 0,                                    \
 125         .forkexec_idx           = 0,                                    \
 126                                                                         \
 127         .flags                  = 1*SD_LOAD_BALANCE                     \
 128                                 | 1*SD_BALANCE_NEWIDLE                  \
 129                                 | 1*SD_BALANCE_EXEC                     \
 130                                 | 1*SD_BALANCE_FORK                     \
 131                                 | 0*SD_BALANCE_WAKE                     \
 132                                 | 1*SD_WAKE_AFFINE                      \
 133                                 | 0*SD_PREFER_LOCAL                     \
 134                                 | 0*SD_SHARE_CPUPOWER                   \
 135                                 | 1*SD_SHARE_PKG_RESOURCES              \
 136                                 | 0*SD_SERIALIZE                        \
 137                                 | sd_balance_for_mc_power()             \
 138                                 | sd_power_saving_flags()               \
 139                                 ,                                       \
 140         .last_balance           = jiffies,                              \
 141         .balance_interval       = 1,                                    \
 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_PREFER_LOCAL                     \
 167                                 | 0*SD_SHARE_CPUPOWER                   \
 168                                 | 0*SD_SHARE_PKG_RESOURCES              \
 169                                 | 0*SD_SERIALIZE                        \
 170                                 | sd_balance_for_package_power()        \
 171                                 | sd_power_saving_flags()               \
 172                                 ,                                       \
 173         .last_balance           = jiffies,                              \
 174         .balance_interval       = 1,                                    \
 175 }
 176 #endif
 177
 178 /* sched_domains SD_ALLNODES_INIT for NUMA machines */
 179 #define SD_ALLNODES_INIT (struct sched_domain) {                        \
 180         .min_interval           = 64,                                   \
 181         .max_interval           = 64*num_online_cpus(),                 \
 182         .busy_factor            = 128,                                  \
 183         .imbalance_pct          = 133,                                  \
 184         .cache_nice_tries       = 1,                                    \
 185         .busy_idx               = 3,                                    \
 186         .idle_idx               = 3,                                    \
 187         .flags                  = 1*SD_LOAD_BALANCE                     \
 188                                 | 1*SD_BALANCE_NEWIDLE                  \
 189                                 | 0*SD_BALANCE_EXEC                     \
 190                                 | 0*SD_BALANCE_FORK                     \
 191                                 | 0*SD_BALANCE_WAKE                     \
 192                                 | 0*SD_WAKE_AFFINE                      \
 193                                 | 0*SD_SHARE_CPUPOWER                   \
 194                                 | 0*SD_POWERSAVINGS_BALANCE             \
 195                                 | 0*SD_SHARE_PKG_RESOURCES              \
 196                                 | 1*SD_SERIALIZE                        \
 197                                 | 0*SD_PREFER_SIBLING                   \
 198                                 ,                                       \
 199         .last_balance           = jiffies,                              \
 200         .balance_interval       = 64,                                   \
 201 }
 202
 203 #ifdef CONFIG_NUMA
 204 #ifndef SD_NODE_INIT
 205 #error Please define an appropriate SD_NODE_INIT in include/asm/topology.h!!!
 206 #endif
 207
 208 #endif /* CONFIG_NUMA */
 209
 210 #ifdef CONFIG_USE_PERCPU_NUMA_NODE_ID
 211 DECLARE_PER_CPU(int, numa_node);
 212
 213 #ifndef numa_node_id
 214 /* Returns the number of the current Node. */
 215 static inline int numa_node_id(void)
 216 {
 217         return __this_cpu_read(numa_node);
 218 }
 219 #endif
 220
 221 #ifndef cpu_to_node
 222 static inline int cpu_to_node(int cpu)
 223 {
 224         return per_cpu(numa_node, cpu);
 225 }
 226 #endif
 227
 228 #ifndef set_numa_node
 229 static inline void set_numa_node(int node)
 230 {
 231         percpu_write(numa_node, node);
 232 }
 233 #endif
 234
 235 #ifndef set_cpu_numa_node
 236 static inline void set_cpu_numa_node(int cpu, int node)
 237 {
 238         per_cpu(numa_node, cpu) = node;
 239 }
 240 #endif
 241
 242 #else   /* !CONFIG_USE_PERCPU_NUMA_NODE_ID */
 243
 244 /* Returns the number of the current Node. */
 245 #ifndef numa_node_id
 246 static inline int numa_node_id(void)
 247 {
 248         return cpu_to_node(raw_smp_processor_id());
 249 }
 250 #endif
 251
 252 #endif  /* [!]CONFIG_USE_PERCPU_NUMA_NODE_ID */
 253
 254 #ifdef CONFIG_HAVE_MEMORYLESS_NODES
 255
 256 /*
 257  * N.B., Do NOT reference the '_numa_mem_' per cpu variable directly.
 258  * It will not be defined when CONFIG_HAVE_MEMORYLESS_NODES is not defined.
 259  * Use the accessor functions set_numa_mem(), numa_mem_id() and cpu_to_mem().
 260  */
 261 DECLARE_PER_CPU(int, _numa_mem_);
 262
 263 #ifndef set_numa_mem
 264 static inline void set_numa_mem(int node)
 265 {
 266         percpu_write(_numa_mem_, node);
 267 }
 268 #endif
 269
 270 #ifndef numa_mem_id
 271 /* Returns the number of the nearest Node with memory */
 272 static inline int numa_mem_id(void)
 273 {
 274         return __this_cpu_read(_numa_mem_);
 275 }
 276 #endif
 277
 278 #ifndef cpu_to_mem
 279 static inline int cpu_to_mem(int cpu)
 280 {
 281         return per_cpu(_numa_mem_, cpu);
 282 }
 283 #endif
 284
 285 #ifndef set_cpu_numa_mem
 286 static inline void set_cpu_numa_mem(int cpu, int node)
 287 {
 288         per_cpu(_numa_mem_, cpu) = node;
 289 }
 290 #endif
 291
 292 #else   /* !CONFIG_HAVE_MEMORYLESS_NODES */
 293
 294 static inline void set_numa_mem(int node) {}
 295
 296 static inline void set_cpu_numa_mem(int cpu, int node) {}
 297
 298 #ifndef numa_mem_id
 299 /* Returns the number of the nearest Node with memory */
 300 static inline int numa_mem_id(void)
 301 {
 302         return numa_node_id();
 303 }
 304 #endif
 305
 306 #ifndef cpu_to_mem
 307 static inline int cpu_to_mem(int cpu)
 308 {
 309         return cpu_to_node(cpu);
 310 }
 311 #endif
 312
 313 #endif  /* [!]CONFIG_HAVE_MEMORYLESS_NODES */
 314
 315 #ifndef topology_physical_package_id
 316 #define topology_physical_package_id(cpu)       ((void)(cpu), -1)
 317 #endif
 318 #ifndef topology_core_id
 319 #define topology_core_id(cpu)                   ((void)(cpu), 0)
 320 #endif
 321 #ifndef topology_thread_cpumask
 322 #define topology_thread_cpumask(cpu)            cpumask_of(cpu)
 323 #endif
 324 #ifndef topology_core_cpumask
 325 #define topology_core_cpumask(cpu)              cpumask_of(cpu)
 326 #endif
 327
 328 #endif /* _LINUX_TOPOLOGY_H */