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 #ifndef node_distance 54 /* Conform to ACPI 2.0 SLIT distance definitions */ 55 #define LOCAL_DISTANCE 10 56 #define REMOTE_DISTANCE 20 57 #define node_distance(from,to) ((from) == (to) ? LOCAL_DISTANCE : REMOTE_DISTANCE) 58 #endif 59 #ifndef RECLAIM_DISTANCE 60 /* 61 * If the distance between nodes in a system is larger than RECLAIM_DISTANCE 62 * (in whatever arch specific measurement units returned by node_distance()) 63 * then switch on zone reclaim on boot. 64 */ 65 #define RECLAIM_DISTANCE 20 66 #endif 67 #ifndef PENALTY_FOR_NODE_WITH_CPUS 68 #define PENALTY_FOR_NODE_WITH_CPUS (1) 69 #endif 70 71 /* 72 * Below are the 3 major initializers used in building sched_domains: 73 * SD_SIBLING_INIT, for SMT domains 74 * SD_CPU_INIT, for SMP domains 75 * SD_NODE_INIT, for NUMA domains 76 * 77 * Any architecture that cares to do any tuning to these values should do so 78 * by defining their own arch-specific initializer in include/asm/topology.h. 79 * A definition there will automagically override these default initializers 80 * and allow arch-specific performance tuning of sched_domains. 81 */ 82 #ifdef CONFIG_SCHED_SMT 83 /* MCD - Do we really need this? It is always on if CONFIG_SCHED_SMT is, 84 * so can't we drop this in favor of CONFIG_SCHED_SMT? 85 */ 86 #define ARCH_HAS_SCHED_WAKE_IDLE 87 /* Common values for SMT siblings */ 88 #ifndef SD_SIBLING_INIT 89 #define SD_SIBLING_INIT (struct sched_domain) { \ 90 .span = CPU_MASK_NONE, \ 91 .parent = NULL, \ 92 .child = NULL, \ 93 .groups = NULL, \ 94 .min_interval = 1, \ 95 .max_interval = 2, \ 96 .busy_factor = 64, \ 97 .imbalance_pct = 110, \ 98 .cache_nice_tries = 0, \ 99 .busy_idx = 0, \ 100 .idle_idx = 0, \ 101 .newidle_idx = 1, \ 102 .wake_idx = 0, \ 103 .forkexec_idx = 0, \ 104 .flags = SD_LOAD_BALANCE \ 105 | SD_BALANCE_NEWIDLE \ 106 | SD_BALANCE_EXEC \ 107 | SD_WAKE_AFFINE \ 108 | SD_WAKE_IDLE \ 109 | SD_SHARE_CPUPOWER, \ 110 .last_balance = jiffies, \ 111 .balance_interval = 1, \ 112 .nr_balance_failed = 0, \ 113 } 114 #endif 115 #endif /* CONFIG_SCHED_SMT */ 116 117 #ifdef CONFIG_SCHED_MC 118 /* Common values for MC siblings. for now mostly derived from SD_CPU_INIT */ 119 #ifndef SD_MC_INIT 120 #define SD_MC_INIT (struct sched_domain) { \ 121 .span = CPU_MASK_NONE, \ 122 .parent = NULL, \ 123 .child = NULL, \ 124 .groups = NULL, \ 125 .min_interval = 1, \ 126 .max_interval = 4, \ 127 .busy_factor = 64, \ 128 .imbalance_pct = 125, \ 129 .cache_nice_tries = 1, \ 130 .busy_idx = 2, \ 131 .idle_idx = 1, \ 132 .newidle_idx = 2, \ 133 .wake_idx = 1, \ 134 .forkexec_idx = 1, \ 135 .flags = SD_LOAD_BALANCE \ 136 | SD_BALANCE_NEWIDLE \ 137 | SD_BALANCE_EXEC \ 138 | SD_WAKE_AFFINE \ 139 | SD_SHARE_PKG_RESOURCES\ 140 | BALANCE_FOR_MC_POWER, \ 141 .last_balance = jiffies, \ 142 .balance_interval = 1, \ 143 .nr_balance_failed = 0, \ 144 } 145 #endif 146 #endif /* CONFIG_SCHED_MC */ 147 148 /* Common values for CPUs */ 149 #ifndef SD_CPU_INIT 150 #define SD_CPU_INIT (struct sched_domain) { \ 151 .span = CPU_MASK_NONE, \ 152 .parent = NULL, \ 153 .child = NULL, \ 154 .groups = NULL, \ 155 .min_interval = 1, \ 156 .max_interval = 4, \ 157 .busy_factor = 64, \ 158 .imbalance_pct = 125, \ 159 .cache_nice_tries = 1, \ 160 .busy_idx = 2, \ 161 .idle_idx = 1, \ 162 .newidle_idx = 2, \ 163 .wake_idx = 1, \ 164 .forkexec_idx = 1, \ 165 .flags = SD_LOAD_BALANCE \ 166 | SD_BALANCE_NEWIDLE \ 167 | SD_BALANCE_EXEC \ 168 | SD_WAKE_AFFINE \ 169 | BALANCE_FOR_PKG_POWER,\ 170 .last_balance = jiffies, \ 171 .balance_interval = 1, \ 172 .nr_balance_failed = 0, \ 173 } 174 #endif 175 176 /* sched_domains SD_ALLNODES_INIT for NUMA machines */ 177 #define SD_ALLNODES_INIT (struct sched_domain) { \ 178 .span = CPU_MASK_NONE, \ 179 .parent = NULL, \ 180 .child = NULL, \ 181 .groups = NULL, \ 182 .min_interval = 64, \ 183 .max_interval = 64*num_online_cpus(), \ 184 .busy_factor = 128, \ 185 .imbalance_pct = 133, \ 186 .cache_hot_time = (10*1000000), \ 187 .cache_nice_tries = 1, \ 188 .busy_idx = 3, \ 189 .idle_idx = 3, \ 190 .newidle_idx = 0, /* unused */ \ 191 .wake_idx = 0, /* unused */ \ 192 .forkexec_idx = 0, /* unused */ \ 193 .flags = SD_LOAD_BALANCE \ 194 | SD_SERIALIZE, \ 195 .last_balance = jiffies, \ 196 .balance_interval = 64, \ 197 .nr_balance_failed = 0, \ 198 } 199 200 #ifdef CONFIG_NUMA 201 #ifndef SD_NODE_INIT 202 #error Please define an appropriate SD_NODE_INIT in include/asm/topology.h!!! 203 #endif 204 #endif /* CONFIG_NUMA */ 205 206 #endif /* _LINUX_TOPOLOGY_H */ 207