| blob | 2158fc0d5a56448001fa8a0cb569b66790cdd60a |
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
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>
36 #ifndef node_has_online_mem
37 #define node_has_online_mem(nid) (1)
38 #endif
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
48 #define for_each_node_with_cpus(node) \
49 for_each_online_node(node) \
50 if (nr_cpus_node(node))
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
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 */
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_IDLE \
103 | SD_SHARE_CPUPOWER, \
104 .last_balance = jiffies, \
105 .balance_interval = 1, \
106 }
107 #endif
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_NEWIDLE \
124 | SD_BALANCE_FORK \
125 | SD_BALANCE_EXEC \
126 | SD_WAKE_AFFINE \
127 | SD_SHARE_PKG_RESOURCES\
128 | BALANCE_FOR_MC_POWER, \
129 .last_balance = jiffies, \
130 .balance_interval = 1, \
131 }
132 #endif
135 /* Common values for CPUs */
136 #ifndef SD_CPU_INIT
137 #define SD_CPU_INIT (struct sched_domain) { \
138 .min_interval = 1, \
139 .max_interval = 4, \
140 .busy_factor = 64, \
141 .imbalance_pct = 125, \
142 .cache_nice_tries = 1, \
143 .busy_idx = 2, \
144 .idle_idx = 1, \
145 .newidle_idx = 2, \
146 .wake_idx = 1, \
147 .forkexec_idx = 1, \
148 .flags = SD_LOAD_BALANCE \
149 | SD_BALANCE_NEWIDLE \
150 | SD_BALANCE_FORK \
151 | SD_BALANCE_EXEC \
152 | SD_WAKE_AFFINE \
153 | BALANCE_FOR_PKG_POWER,\
154 .last_balance = jiffies, \
155 .balance_interval = 1, \
156 }
157 #endif
159 /* sched_domains SD_ALLNODES_INIT for NUMA machines */
160 #define SD_ALLNODES_INIT (struct sched_domain) { \
161 .min_interval = 64, \
162 .max_interval = 64*num_online_cpus(), \
163 .busy_factor = 128, \
164 .imbalance_pct = 133, \
165 .cache_nice_tries = 1, \
166 .busy_idx = 3, \
167 .idle_idx = 3, \
168 .flags = SD_LOAD_BALANCE \
169 | SD_BALANCE_NEWIDLE \
170 | SD_WAKE_AFFINE \
171 | SD_SERIALIZE, \
172 .last_balance = jiffies, \
173 .balance_interval = 64, \
174 }
176 #ifdef CONFIG_NUMA
177 #ifndef SD_NODE_INIT
178 #error Please define an appropriate SD_NODE_INIT in include/asm/topology.h!!!
179 #endif
182 #ifndef topology_physical_package_id
183 #define topology_physical_package_id(cpu) ((void)(cpu), -1)
184 #endif
185 #ifndef topology_core_id
186 #define topology_core_id(cpu) ((void)(cpu), 0)
187 #endif
188 #ifndef topology_thread_siblings
189 #define topology_thread_siblings(cpu) cpumask_of_cpu(cpu)
190 #endif
191 #ifndef topology_core_siblings
192 #define topology_core_siblings(cpu) cpumask_of_cpu(cpu)
193 #endif