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 PENALTY_FOR_NODE_WITH_CPUS 60 #define PENALTY_FOR_NODE_WITH_CPUS (1) 61 #endif 62 63 /* 64 * Below are the 3 major initializers used in building sched_domains: 65 * SD_SIBLING_INIT, for SMT domains 66 * SD_CPU_INIT, for SMP domains 67 * SD_NODE_INIT, for NUMA domains 68 * 69 * Any architecture that cares to do any tuning to these values should do so 70 * by defining their own arch-specific initializer in include/asm/topology.h. 71 * A definition there will automagically override these default initializers 72 * and allow arch-specific performance tuning of sched_domains. 73 */ 74 #ifdef CONFIG_SCHED_SMT 75 /* MCD - Do we really need this? It is always on if CONFIG_SCHED_SMT is, 76 * so can't we drop this in favor of CONFIG_SCHED_SMT? 77 */ 78 #define ARCH_HAS_SCHED_WAKE_IDLE 79 /* Common values for SMT siblings */ 80 #ifndef SD_SIBLING_INIT 81 #define SD_SIBLING_INIT (struct sched_domain) { \ 82 .span = CPU_MASK_NONE, \ 83 .parent = NULL, \ 84 .groups = NULL, \ 85 .min_interval = 1, \ 86 .max_interval = 2, \ 87 .busy_factor = 8, \ 88 .imbalance_pct = 110, \ 89 .cache_hot_time = 0, \ 90 .cache_nice_tries = 0, \ 91 .per_cpu_gain = 25, \ 92 .busy_idx = 0, \ 93 .idle_idx = 0, \ 94 .newidle_idx = 1, \ 95 .wake_idx = 0, \ 96 .forkexec_idx = 0, \ 97 .flags = SD_LOAD_BALANCE \ 98 | SD_BALANCE_NEWIDLE \ 99 | SD_BALANCE_EXEC \ 100 | SD_WAKE_AFFINE \ 101 | SD_WAKE_IDLE \ 102 | SD_SHARE_CPUPOWER, \ 103 .last_balance = jiffies, \ 104 .balance_interval = 1, \ 105 .nr_balance_failed = 0, \ 106 } 107 #endif 108 #endif /* CONFIG_SCHED_SMT */ 109 110 /* Common values for CPUs */ 111 #ifndef SD_CPU_INIT 112 #define SD_CPU_INIT (struct sched_domain) { \ 113 .span = CPU_MASK_NONE, \ 114 .parent = NULL, \ 115 .groups = NULL, \ 116 .min_interval = 1, \ 117 .max_interval = 4, \ 118 .busy_factor = 64, \ 119 .imbalance_pct = 125, \ 120 .cache_hot_time = (5*1000000/2), \ 121 .cache_nice_tries = 1, \ 122 .per_cpu_gain = 100, \ 123 .busy_idx = 2, \ 124 .idle_idx = 1, \ 125 .newidle_idx = 2, \ 126 .wake_idx = 1, \ 127 .forkexec_idx = 1, \ 128 .flags = SD_LOAD_BALANCE \ 129 | SD_BALANCE_NEWIDLE \ 130 | SD_BALANCE_EXEC \ 131 | SD_WAKE_AFFINE, \ 132 .last_balance = jiffies, \ 133 .balance_interval = 1, \ 134 .nr_balance_failed = 0, \ 135 } 136 #endif 137 138 /* sched_domains SD_ALLNODES_INIT for NUMA machines */ 139 #define SD_ALLNODES_INIT (struct sched_domain) { \ 140 .span = CPU_MASK_NONE, \ 141 .parent = NULL, \ 142 .groups = NULL, \ 143 .min_interval = 64, \ 144 .max_interval = 64*num_online_cpus(), \ 145 .busy_factor = 128, \ 146 .imbalance_pct = 133, \ 147 .cache_hot_time = (10*1000000), \ 148 .cache_nice_tries = 1, \ 149 .busy_idx = 3, \ 150 .idle_idx = 3, \ 151 .newidle_idx = 0, /* unused */ \ 152 .wake_idx = 0, /* unused */ \ 153 .forkexec_idx = 0, /* unused */ \ 154 .per_cpu_gain = 100, \ 155 .flags = SD_LOAD_BALANCE, \ 156 .last_balance = jiffies, \ 157 .balance_interval = 64, \ 158 .nr_balance_failed = 0, \ 159 } 160 161 #ifdef CONFIG_NUMA 162 #ifndef SD_NODE_INIT 163 #error Please define an appropriate SD_NODE_INIT in include/asm/topology.h!!! 164 #endif 165 #endif /* CONFIG_NUMA */ 166 167 #endif /* _LINUX_TOPOLOGY_H */ 168