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 <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                                 | 1*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                                 | 1*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 */