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         .flags                  = SD_LOAD_BALANCE       \
  94                                 | SD_BALANCE_NEWIDLE    \
  95                                 | SD_BALANCE_FORK       \
  96                                 | SD_BALANCE_EXEC       \
  97                                 | SD_WAKE_AFFINE        \
  98                                 | SD_WAKE_BALANCE       \
  99                                 | SD_SHARE_CPUPOWER,    \
 100         .last_balance           = jiffies,              \
 101         .balance_interval       = 1,                    \
 102         .smt_gain               = 1178, /* 15% */       \
 103 }
 104 #endif
 105 #endif /* CONFIG_SCHED_SMT */
 106
 107 #ifdef CONFIG_SCHED_MC
 108 /* Common values for MC siblings. for now mostly derived from SD_CPU_INIT */
 109 #ifndef SD_MC_INIT
 110 #define SD_MC_INIT (struct sched_domain) {              \
 111         .min_interval           = 1,                    \
 112         .max_interval           = 4,                    \
 113         .busy_factor            = 64,                   \
 114         .imbalance_pct          = 125,                  \
 115         .cache_nice_tries       = 1,                    \
 116         .busy_idx               = 2,                    \
 117         .wake_idx               = 1,                    \
 118         .forkexec_idx           = 1,                    \
 119         .flags                  = SD_LOAD_BALANCE       \
 120                                 | SD_BALANCE_FORK       \
 121                                 | SD_BALANCE_EXEC       \
 122                                 | SD_WAKE_AFFINE        \
 123                                 | SD_WAKE_BALANCE       \
 124                                 | SD_SHARE_PKG_RESOURCES\
 125                                 | sd_balance_for_mc_power()\
 126                                 | sd_power_saving_flags(),\
 127         .last_balance           = jiffies,              \
 128         .balance_interval       = 1,                    \
 129 }
 130 #endif
 131 #endif /* CONFIG_SCHED_MC */
 132
 133 /* Common values for CPUs */
 134 #ifndef SD_CPU_INIT
 135 #define SD_CPU_INIT (struct sched_domain) {             \
 136         .min_interval           = 1,                    \
 137         .max_interval           = 4,                    \
 138         .busy_factor            = 64,                   \
 139         .imbalance_pct          = 125,                  \
 140         .cache_nice_tries       = 1,                    \
 141         .busy_idx               = 2,                    \
 142         .idle_idx               = 1,                    \
 143         .newidle_idx            = 2,                    \
 144         .wake_idx               = 1,                    \
 145         .forkexec_idx           = 1,                    \
 146         .flags                  = SD_LOAD_BALANCE       \
 147                                 | SD_BALANCE_EXEC       \
 148                                 | SD_BALANCE_FORK       \
 149                                 | SD_WAKE_AFFINE        \
 150                                 | SD_WAKE_BALANCE       \
 151                                 | sd_balance_for_package_power()\
 152                                 | sd_power_saving_flags(),\
 153         .last_balance           = jiffies,              \
 154         .balance_interval       = 1,                    \
 155 }
 156 #endif
 157
 158 /* sched_domains SD_ALLNODES_INIT for NUMA machines */
 159 #define SD_ALLNODES_INIT (struct sched_domain) {        \
 160         .min_interval           = 64,                   \
 161         .max_interval           = 64*num_online_cpus(), \
 162         .busy_factor            = 128,                  \
 163         .imbalance_pct          = 133,                  \
 164         .cache_nice_tries       = 1,                    \
 165         .busy_idx               = 3,                    \
 166         .idle_idx               = 3,                    \
 167         .flags                  = SD_LOAD_BALANCE       \
 168                                 | SD_BALANCE_NEWIDLE    \
 169                                 | SD_WAKE_AFFINE        \
 170                                 | SD_SERIALIZE,         \
 171         .last_balance           = jiffies,              \
 172         .balance_interval       = 64,                   \
 173 }
 174
 175 #ifdef CONFIG_NUMA
 176 #ifndef SD_NODE_INIT
 177 #error Please define an appropriate SD_NODE_INIT in include/asm/topology.h!!!
 178 #endif
 179 #endif /* CONFIG_NUMA */
 180
 181 #ifndef topology_physical_package_id
 182 #define topology_physical_package_id(cpu)       ((void)(cpu), -1)
 183 #endif
 184 #ifndef topology_core_id
 185 #define topology_core_id(cpu)                   ((void)(cpu), 0)
 186 #endif
 187 #ifndef topology_thread_siblings
 188 #define topology_thread_siblings(cpu)           cpumask_of_cpu(cpu)
 189 #endif
 190 #ifndef topology_core_siblings
 191 #define topology_core_siblings(cpu)             cpumask_of_cpu(cpu)
 192 #endif
 193 #ifndef topology_thread_cpumask
 194 #define topology_thread_cpumask(cpu)            cpumask_of(cpu)
 195 #endif
 196 #ifndef topology_core_cpumask
 197 #define topology_core_cpumask(cpu)              cpumask_of(cpu)
 198 #endif
 199
 200 /* Returns the number of the current Node. */
 201 #ifndef numa_node_id
 202 #define numa_node_id()          (cpu_to_node(raw_smp_processor_id()))
 203 #endif
 204
 205 #endif /* _LINUX_TOPOLOGY_H */