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                 cpumask_t __tmp__;                                              \
  44                 __tmp__ = node_to_cpumask(node);                                \
  45                 cpus_weight(__tmp__);                                           \
  46         })
  47 #endif
  48
  49 #define for_each_node_with_cpus(node)                                           \
  50         for_each_online_node(node)                                              \
  51                 if (nr_cpus_node(node))
  52
  53 void arch_update_cpu_topology(void);
  54
  55 /* Conform to ACPI 2.0 SLIT distance definitions */
  56 #define LOCAL_DISTANCE          10
  57 #define REMOTE_DISTANCE         20
  58 #ifndef node_distance
  59 #define node_distance(from,to)  ((from) == (to) ? LOCAL_DISTANCE : REMOTE_DISTANCE)
  60 #endif
  61 #ifndef RECLAIM_DISTANCE
  62 /*
  63  * If the distance between nodes in a system is larger than RECLAIM_DISTANCE
  64  * (in whatever arch specific measurement units returned by node_distance())
  65  * then switch on zone reclaim on boot.
  66  */
  67 #define RECLAIM_DISTANCE 20
  68 #endif
  69 #ifndef PENALTY_FOR_NODE_WITH_CPUS
  70 #define PENALTY_FOR_NODE_WITH_CPUS      (1)
  71 #endif
  72
  73 /*
  74  * Below are the 3 major initializers used in building sched_domains:
  75  * SD_SIBLING_INIT, for SMT domains
  76  * SD_CPU_INIT, for SMP domains
  77  * SD_NODE_INIT, for NUMA domains
  78  *
  79  * Any architecture that cares to do any tuning to these values should do so
  80  * by defining their own arch-specific initializer in include/asm/topology.h.
  81  * A definition there will automagically override these default initializers
  82  * and allow arch-specific performance tuning of sched_domains.
  83  */
  84 #ifdef CONFIG_SCHED_SMT
  85 /* MCD - Do we really need this?  It is always on if CONFIG_SCHED_SMT is,
  86  * so can't we drop this in favor of CONFIG_SCHED_SMT?
  87  */
  88 #define ARCH_HAS_SCHED_WAKE_IDLE
  89 /* Common values for SMT siblings */
  90 #ifndef SD_SIBLING_INIT
  91 #define SD_SIBLING_INIT (struct sched_domain) {         \
  92         .span                   = CPU_MASK_NONE,        \
  93         .parent                 = NULL,                 \
  94         .child                  = NULL,                 \
  95         .groups                 = NULL,                 \
  96         .min_interval           = 1,                    \
  97         .max_interval           = 2,                    \
  98         .busy_factor            = 64,                   \
  99         .imbalance_pct          = 110,                  \
 100         .cache_nice_tries       = 0,                    \
 101         .busy_idx               = 0,                    \
 102         .idle_idx               = 0,                    \
 103         .newidle_idx            = 0,                    \
 104         .wake_idx               = 0,                    \
 105         .forkexec_idx           = 0,                    \
 106         .flags                  = SD_LOAD_BALANCE       \
 107                                 | SD_BALANCE_NEWIDLE    \
 108                                 | SD_BALANCE_FORK       \
 109                                 | SD_BALANCE_EXEC       \
 110                                 | SD_WAKE_AFFINE        \
 111                                 | SD_WAKE_IDLE          \
 112                                 | SD_SHARE_CPUPOWER,    \
 113         .last_balance           = jiffies,              \
 114         .balance_interval       = 1,                    \
 115         .nr_balance_failed      = 0,                    \
 116 }
 117 #endif
 118 #endif /* CONFIG_SCHED_SMT */
 119
 120 #ifdef CONFIG_SCHED_MC
 121 /* Common values for MC siblings. for now mostly derived from SD_CPU_INIT */
 122 #ifndef SD_MC_INIT
 123 #define SD_MC_INIT (struct sched_domain) {              \
 124         .span                   = CPU_MASK_NONE,        \
 125         .parent                 = NULL,                 \
 126         .child                  = NULL,                 \
 127         .groups                 = NULL,                 \
 128         .min_interval           = 1,                    \
 129         .max_interval           = 4,                    \
 130         .busy_factor            = 64,                   \
 131         .imbalance_pct          = 125,                  \
 132         .cache_nice_tries       = 1,                    \
 133         .busy_idx               = 2,                    \
 134         .idle_idx               = 0,                    \
 135         .newidle_idx            = 0,                    \
 136         .wake_idx               = 1,                    \
 137         .forkexec_idx           = 1,                    \
 138         .flags                  = SD_LOAD_BALANCE       \
 139                                 | SD_BALANCE_NEWIDLE    \
 140                                 | SD_BALANCE_FORK       \
 141                                 | SD_BALANCE_EXEC       \
 142                                 | SD_WAKE_AFFINE        \
 143                                 | SD_SHARE_PKG_RESOURCES\
 144                                 | BALANCE_FOR_MC_POWER, \
 145         .last_balance           = jiffies,              \
 146         .balance_interval       = 1,                    \
 147         .nr_balance_failed      = 0,                    \
 148 }
 149 #endif
 150 #endif /* CONFIG_SCHED_MC */
 151
 152 /* Common values for CPUs */
 153 #ifndef SD_CPU_INIT
 154 #define SD_CPU_INIT (struct sched_domain) {             \
 155         .span                   = CPU_MASK_NONE,        \
 156         .parent                 = NULL,                 \
 157         .child                  = NULL,                 \
 158         .groups                 = NULL,                 \
 159         .min_interval           = 1,                    \
 160         .max_interval           = 4,                    \
 161         .busy_factor            = 64,                   \
 162         .imbalance_pct          = 125,                  \
 163         .cache_nice_tries       = 1,                    \
 164         .busy_idx               = 2,                    \
 165         .idle_idx               = 1,                    \
 166         .newidle_idx            = 2,                    \
 167         .wake_idx               = 1,                    \
 168         .forkexec_idx           = 1,                    \
 169         .flags                  = SD_LOAD_BALANCE       \
 170                                 | SD_BALANCE_NEWIDLE    \
 171                                 | SD_BALANCE_FORK       \
 172                                 | SD_BALANCE_EXEC       \
 173                                 | SD_WAKE_AFFINE        \
 174                                 | BALANCE_FOR_PKG_POWER,\
 175         .last_balance           = jiffies,              \
 176         .balance_interval       = 1,                    \
 177         .nr_balance_failed      = 0,                    \
 178 }
 179 #endif
 180
 181 /* sched_domains SD_ALLNODES_INIT for NUMA machines */
 182 #define SD_ALLNODES_INIT (struct sched_domain) {        \
 183         .span                   = CPU_MASK_NONE,        \
 184         .parent                 = NULL,                 \
 185         .child                  = NULL,                 \
 186         .groups                 = NULL,                 \
 187         .min_interval           = 64,                   \
 188         .max_interval           = 64*num_online_cpus(), \
 189         .busy_factor            = 128,                  \
 190         .imbalance_pct          = 133,                  \
 191         .cache_nice_tries       = 1,                    \
 192         .busy_idx               = 3,                    \
 193         .idle_idx               = 3,                    \
 194         .newidle_idx            = 0, /* unused */       \
 195         .wake_idx               = 0, /* unused */       \
 196         .forkexec_idx           = 0, /* unused */       \
 197         .flags                  = SD_LOAD_BALANCE       \
 198                                 | SD_SERIALIZE, \
 199         .last_balance           = jiffies,              \
 200         .balance_interval       = 64,                   \
 201         .nr_balance_failed      = 0,                    \
 202 }
 203
 204 #ifdef CONFIG_NUMA
 205 #ifndef SD_NODE_INIT
 206 #error Please define an appropriate SD_NODE_INIT in include/asm/topology.h!!!
 207 #endif
 208 #endif /* CONFIG_NUMA */
 209
 210 #endif /* _LINUX_TOPOLOGY_H */