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 int 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_BALANCE \ 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_FORK \ 124 | SD_BALANCE_EXEC \ 125 | SD_WAKE_AFFINE \ 126 | SD_WAKE_BALANCE \ 127 | SD_SHARE_PKG_RESOURCES\ 128 | sd_balance_for_mc_power()\ 129 | sd_power_saving_flags(),\ 130 .last_balance = jiffies, \ 131 .balance_interval = 1, \ 132 } 133 #endif 134 #endif /* CONFIG_SCHED_MC */ 135 136 /* Common values for CPUs */ 137 #ifndef SD_CPU_INIT 138 #define SD_CPU_INIT (struct sched_domain) { \ 139 .min_interval = 1, \ 140 .max_interval = 4, \ 141 .busy_factor = 64, \ 142 .imbalance_pct = 125, \ 143 .cache_nice_tries = 1, \ 144 .busy_idx = 2, \ 145 .idle_idx = 1, \ 146 .newidle_idx = 2, \ 147 .wake_idx = 1, \ 148 .forkexec_idx = 1, \ 149 .flags = SD_LOAD_BALANCE \ 150 | SD_BALANCE_EXEC \ 151 | SD_BALANCE_FORK \ 152 | SD_WAKE_AFFINE \ 153 | SD_WAKE_BALANCE \ 154 | sd_balance_for_package_power()\ 155 | sd_power_saving_flags(),\ 156 .last_balance = jiffies, \ 157 .balance_interval = 1, \ 158 } 159 #endif 160 161 /* sched_domains SD_ALLNODES_INIT for NUMA machines */ 162 #define SD_ALLNODES_INIT (struct sched_domain) { \ 163 .min_interval = 64, \ 164 .max_interval = 64*num_online_cpus(), \ 165 .busy_factor = 128, \ 166 .imbalance_pct = 133, \ 167 .cache_nice_tries = 1, \ 168 .busy_idx = 3, \ 169 .idle_idx = 3, \ 170 .flags = SD_LOAD_BALANCE \ 171 | SD_BALANCE_NEWIDLE \ 172 | SD_WAKE_AFFINE \ 173 | SD_SERIALIZE, \ 174 .last_balance = jiffies, \ 175 .balance_interval = 64, \ 176 } 177 178 #ifdef CONFIG_NUMA 179 #ifndef SD_NODE_INIT 180 #error Please define an appropriate SD_NODE_INIT in include/asm/topology.h!!! 181 #endif 182 #endif /* CONFIG_NUMA */ 183 184 #ifndef topology_physical_package_id 185 #define topology_physical_package_id(cpu) ((void)(cpu), -1) 186 #endif 187 #ifndef topology_core_id 188 #define topology_core_id(cpu) ((void)(cpu), 0) 189 #endif 190 #ifndef topology_thread_siblings 191 #define topology_thread_siblings(cpu) cpumask_of_cpu(cpu) 192 #endif 193 #ifndef topology_core_siblings 194 #define topology_core_siblings(cpu) cpumask_of_cpu(cpu) 195 #endif 196 197 #endif /* _LINUX_TOPOLOGY_H */ 198