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 <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
  49int 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_PREFER_LOCAL                     \
 133                                | 0*SD_SHARE_CPUPOWER                   \
 134                                | 1*SD_SHARE_PKG_RESOURCES              \
 135                                | 0*SD_SERIALIZE                        \
 136                                ,                                       \
 137        .last_balance           = jiffies,                              \
 138        .balance_interval       = 1,                                    \
 139}
 140#endif
 141#endif /* CONFIG_SCHED_MC */
 142
 143/* Common values for CPUs */
 144#ifndef SD_CPU_INIT
 145#define SD_CPU_INIT (struct sched_domain) {                             \
 146        .min_interval           = 1,                                    \
 147        .max_interval           = 4,                                    \
 148        .busy_factor            = 64,                                   \
 149        .imbalance_pct          = 125,                                  \
 150        .cache_nice_tries       = 1,                                    \
 151        .busy_idx               = 2,                                    \
 152        .idle_idx               = 1,                                    \
 153        .newidle_idx            = 0,                                    \
 154        .wake_idx               = 0,                                    \
 155        .forkexec_idx           = 0,                                    \
 156                                                                        \
 157        .flags                  = 1*SD_LOAD_BALANCE                     \
 158                                | 1*SD_BALANCE_NEWIDLE                  \
 159                                | 1*SD_BALANCE_EXEC                     \
 160                                | 1*SD_BALANCE_FORK                     \
 161                                | 0*SD_BALANCE_WAKE                     \
 162                                | 1*SD_WAKE_AFFINE                      \
 163                                | 0*SD_PREFER_LOCAL                     \
 164                                | 0*SD_SHARE_CPUPOWER                   \
 165                                | 0*SD_SHARE_PKG_RESOURCES              \
 166                                | 0*SD_SERIALIZE                        \
 167                                | 1*SD_PREFER_SIBLING                   \
 168                                ,                                       \
 169        .last_balance           = jiffies,                              \
 170        .balance_interval       = 1,                                    \
 171}
 172#endif
 173
 174#ifdef CONFIG_SCHED_BOOK
 175#ifndef SD_BOOK_INIT
 176#error Please define an appropriate SD_BOOK_INIT in include/asm/topology.h!!!
 177#endif
 178#endif /* CONFIG_SCHED_BOOK */
 179
 180#ifdef CONFIG_USE_PERCPU_NUMA_NODE_ID
 181DECLARE_PER_CPU(int, numa_node);
 182
 183#ifndef numa_node_id
 184/* Returns the number of the current Node. */
 185static inline int numa_node_id(void)
 186{
 187        return __this_cpu_read(numa_node);
 188}
 189#endif
 190
 191#ifndef cpu_to_node
 192static inline int cpu_to_node(int cpu)
 193{
 194        return per_cpu(numa_node, cpu);
 195}
 196#endif
 197
 198#ifndef set_numa_node
 199static inline void set_numa_node(int node)
 200{
 201        this_cpu_write(numa_node, node);
 202}
 203#endif
 204
 205#ifndef set_cpu_numa_node
 206static inline void set_cpu_numa_node(int cpu, int node)
 207{
 208        per_cpu(numa_node, cpu) = node;
 209}
 210#endif
 211
 212#else   /* !CONFIG_USE_PERCPU_NUMA_NODE_ID */
 213
 214/* Returns the number of the current Node. */
 215#ifndef numa_node_id
 216static inline int numa_node_id(void)
 217{
 218        return cpu_to_node(raw_smp_processor_id());
 219}
 220#endif
 221
 222#endif  /* [!]CONFIG_USE_PERCPU_NUMA_NODE_ID */
 223
 224#ifdef CONFIG_HAVE_MEMORYLESS_NODES
 225
 226/*
 227 * N.B., Do NOT reference the '_numa_mem_' per cpu variable directly.
 228 * It will not be defined when CONFIG_HAVE_MEMORYLESS_NODES is not defined.
 229 * Use the accessor functions set_numa_mem(), numa_mem_id() and cpu_to_mem().
 230 */
 231DECLARE_PER_CPU(int, _numa_mem_);
 232
 233#ifndef set_numa_mem
 234static inline void set_numa_mem(int node)
 235{
 236        this_cpu_write(_numa_mem_, node);
 237}
 238#endif
 239
 240#ifndef numa_mem_id
 241/* Returns the number of the nearest Node with memory */
 242static inline int numa_mem_id(void)
 243{
 244        return __this_cpu_read(_numa_mem_);
 245}
 246#endif
 247
 248#ifndef cpu_to_mem
 249static inline int cpu_to_mem(int cpu)
 250{
 251        return per_cpu(_numa_mem_, cpu);
 252}
 253#endif
 254
 255#ifndef set_cpu_numa_mem
 256static inline void set_cpu_numa_mem(int cpu, int node)
 257{
 258        per_cpu(_numa_mem_, cpu) = node;
 259}
 260#endif
 261
 262#else   /* !CONFIG_HAVE_MEMORYLESS_NODES */
 263
 264#ifndef numa_mem_id
 265/* Returns the number of the nearest Node with memory */
 266static inline int numa_mem_id(void)
 267{
 268        return numa_node_id();
 269}
 270#endif
 271
 272#ifndef cpu_to_mem
 273static inline int cpu_to_mem(int cpu)
 274{
 275        return cpu_to_node(cpu);
 276}
 277#endif
 278
 279#endif  /* [!]CONFIG_HAVE_MEMORYLESS_NODES */
 280
 281#ifndef topology_physical_package_id
 282#define topology_physical_package_id(cpu)       ((void)(cpu), -1)
 283#endif
 284#ifndef topology_core_id
 285#define topology_core_id(cpu)                   ((void)(cpu), 0)
 286#endif
 287#ifndef topology_thread_cpumask
 288#define topology_thread_cpumask(cpu)            cpumask_of(cpu)
 289#endif
 290#ifndef topology_core_cpumask
 291#define topology_core_cpumask(cpu)              cpumask_of(cpu)
 292#endif
 293
 294#endif /* _LINUX_TOPOLOGY_H */
 295
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