linux/include/linux/topology.h
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   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
  48int 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                                | 0*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                                | 0*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 */
 227
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