Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | #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 | .flags = SD_LOAD_BALANCE \ |
| 93 | | SD_BALANCE_NEWIDLE \ |
| 94 | | SD_BALANCE_EXEC \ |
| 95 | | SD_WAKE_AFFINE \ |
| 96 | | SD_WAKE_IDLE \ |
| 97 | | SD_SHARE_CPUPOWER, \ |
| 98 | .last_balance = jiffies, \ |
| 99 | .balance_interval = 1, \ |
| 100 | .nr_balance_failed = 0, \ |
| 101 | } |
| 102 | #endif |
| 103 | #endif /* CONFIG_SCHED_SMT */ |
| 104 | |
| 105 | /* Common values for CPUs */ |
| 106 | #ifndef SD_CPU_INIT |
| 107 | #define SD_CPU_INIT (struct sched_domain) { \ |
| 108 | .span = CPU_MASK_NONE, \ |
| 109 | .parent = NULL, \ |
| 110 | .groups = NULL, \ |
| 111 | .min_interval = 1, \ |
| 112 | .max_interval = 4, \ |
| 113 | .busy_factor = 64, \ |
| 114 | .imbalance_pct = 125, \ |
| 115 | .cache_hot_time = (5*1000000/2), \ |
| 116 | .cache_nice_tries = 1, \ |
| 117 | .per_cpu_gain = 100, \ |
| 118 | .flags = SD_LOAD_BALANCE \ |
| 119 | | SD_BALANCE_NEWIDLE \ |
| 120 | | SD_BALANCE_EXEC \ |
| 121 | | SD_WAKE_AFFINE \ |
| 122 | | SD_WAKE_IDLE \ |
| 123 | | SD_WAKE_BALANCE, \ |
| 124 | .last_balance = jiffies, \ |
| 125 | .balance_interval = 1, \ |
| 126 | .nr_balance_failed = 0, \ |
| 127 | } |
| 128 | #endif |
| 129 | |
| 130 | #ifdef CONFIG_NUMA |
| 131 | #ifndef SD_NODE_INIT |
| 132 | #error Please define an appropriate SD_NODE_INIT in include/asm/topology.h!!! |
| 133 | #endif |
| 134 | #endif /* CONFIG_NUMA */ |
| 135 | |
| 136 | #endif /* _LINUX_TOPOLOGY_H */ |