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)                              \
  42         ({                                              \
  43                 node_to_cpumask_ptr(__tmp__, node);     \
  44                 cpus_weight(*__tmp__);                  \
  45         })
  46 #endif
  47
  48 #define for_each_node_with_cpus(node)                   \
  49         for_each_online_node(node)                      \
  50                 if (nr_cpus_node(node))
  51
  52 void arch_update_cpu_topology(void);
  53
  54 /* Conform to ACPI 2.0 SLIT distance definitions */
  55 #define LOCAL_DISTANCE          10
  56 #define REMOTE_DISTANCE         20
  57 #ifndef node_distance
  58 #define node_distance(from,to)  ((from) == (to) ? LOCAL_DISTANCE : REMOTE_DISTANCE)
  59 #endif
  60 #ifndef RECLAIM_DISTANCE
  61 /*
  62  * If the distance between nodes in a system is larger than RECLAIM_DISTANCE
  63  * (in whatever arch specific measurement units returned by node_distance())
  64  * then switch on zone reclaim on boot.
  65  */
  66 #define RECLAIM_DISTANCE 20
  67 #endif
  68 #ifndef PENALTY_FOR_NODE_WITH_CPUS
  69 #define PENALTY_FOR_NODE_WITH_CPUS      (1)
  70 #endif
  71
  72 /*
  73  * Below are the 3 major initializers used in building sched_domains:
  74  * SD_SIBLING_INIT, for SMT domains
  75  * SD_CPU_INIT, for SMP domains
  76  * SD_NODE_INIT, for NUMA domains
  77  *
  78  * Any architecture that cares to do any tuning to these values should do so
  79  * by defining their own arch-specific initializer in include/asm/topology.h.
  80  * A definition there will automagically override these default initializers
  81  * and allow arch-specific performance tuning of sched_domains.
  82  * (Only non-zero and non-null fields need be specified.)
  83  */
  84
  85 #ifdef CONFIG_SCHED_SMT
  86 /* MCD - Do we really need this?  It is always on if CONFIG_SCHED_SMT is,
  87  * so can't we drop this in favor of CONFIG_SCHED_SMT?
  88  */
  89 #define ARCH_HAS_SCHED_WAKE_IDLE
  90 /* Common values for SMT siblings */
  91 #ifndef SD_SIBLING_INIT
  92 #define SD_SIBLING_INIT (struct sched_domain) {         \
  93         .min_interval           = 1,                    \
  94         .max_interval           = 2,                    \
  95         .busy_factor            = 64,                   \
  96         .imbalance_pct          = 110,                  \
  97         .flags                  = SD_LOAD_BALANCE       \
  98                                 | SD_BALANCE_NEWIDLE    \
  99                                 | SD_BALANCE_FORK       \
 100                                 | SD_BALANCE_EXEC       \
 101                                 | SD_WAKE_AFFINE        \
 102                                 | SD_WAKE_IDLE          \
 103                                 | SD_SHARE_CPUPOWER,    \
 104         .last_balance           = jiffies,              \
 105         .balance_interval       = 1,                    \
 106 }
 107 #endif
 108 #endif /* CONFIG_SCHED_SMT */
 109
 110 #ifdef CONFIG_SCHED_MC
 111 /* Common values for MC siblings. for now mostly derived from SD_CPU_INIT */
 112 #ifndef SD_MC_INIT
 113 #define SD_MC_INIT (struct sched_domain) {              \
 114         .min_interval           = 1,                    \
 115         .max_interval           = 4,                    \
 116         .busy_factor            = 64,                   \
 117         .imbalance_pct          = 125,                  \
 118         .cache_nice_tries       = 1,                    \
 119         .busy_idx               = 2,                    \
 120         .wake_idx               = 1,                    \
 121         .forkexec_idx           = 1,                    \
 122         .flags                  = SD_LOAD_BALANCE       \
 123                                 | SD_BALANCE_NEWIDLE    \
 124                                 | SD_BALANCE_FORK       \
 125                                 | SD_BALANCE_EXEC       \
 126                                 | SD_WAKE_AFFINE        \
 127                                 | SD_SHARE_PKG_RESOURCES\
 128                                 | BALANCE_FOR_MC_POWER, \
 129         .last_balance           = jiffies,              \
 130         .balance_interval       = 1,                    \
 131 }
 132 #endif
 133 #endif /* CONFIG_SCHED_MC */
 134
 135 /* Common values for CPUs */
 136 #ifndef SD_CPU_INIT
 137 #define SD_CPU_INIT (struct sched_domain) {             \
 138         .min_interval           = 1,                    \
 139         .max_interval           = 4,                    \
 140         .busy_factor            = 64,                   \
 141         .imbalance_pct          = 125,                  \
 142         .cache_nice_tries       = 1,                    \
 143         .busy_idx               = 2,                    \
 144         .idle_idx               = 1,                    \
 145         .newidle_idx            = 2,                    \
 146         .wake_idx               = 1,                    \
 147         .forkexec_idx           = 1,                    \
 148         .flags                  = SD_LOAD_BALANCE       \
 149                                 | SD_BALANCE_NEWIDLE    \
 150                                 | SD_BALANCE_FORK       \
 151                                 | SD_BALANCE_EXEC       \
 152                                 | SD_WAKE_AFFINE        \
 153                                 | BALANCE_FOR_PKG_POWER,\
 154         .last_balance           = jiffies,              \
 155         .balance_interval       = 1,                    \
 156 }
 157 #endif
 158
 159 /* sched_domains SD_ALLNODES_INIT for NUMA machines */
 160 #define SD_ALLNODES_INIT (struct sched_domain) {        \
 161         .min_interval           = 64,                   \
 162         .max_interval           = 64*num_online_cpus(), \
 163         .busy_factor            = 128,                  \
 164         .imbalance_pct          = 133,                  \
 165         .cache_nice_tries       = 1,                    \
 166         .busy_idx               = 3,                    \
 167         .idle_idx               = 3,                    \
 168         .flags                  = SD_LOAD_BALANCE       \
 169                                 | SD_BALANCE_NEWIDLE    \
 170                                 | SD_WAKE_AFFINE        \
 171                                 | SD_SERIALIZE,         \
 172         .last_balance           = jiffies,              \
 173         .balance_interval       = 64,                   \
 174 }
 175
 176 #ifdef CONFIG_NUMA
 177 #ifndef SD_NODE_INIT
 178 #error Please define an appropriate SD_NODE_INIT in include/asm/topology.h!!!
 179 #endif
 180 #endif /* CONFIG_NUMA */
 181
 182 #endif /* _LINUX_TOPOLOGY_H */