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 <[email protected]> 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 */ 211