| blob | 7402c1a27c4f5149e1fe71c02356a909ec99ccc0 |
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) cpumask_weight(cpumask_of_node(node))
42 #endif
44 #define for_each_node_with_cpus(node) \
45 for_each_online_node(node) \
46 if (nr_cpus_node(node))
50 /* Conform to ACPI 2.0 SLIT distance definitions */
51 #define LOCAL_DISTANCE 10
52 #define REMOTE_DISTANCE 20
53 #ifndef node_distance
54 #define node_distance(from,to) ((from) == (to) ? LOCAL_DISTANCE : REMOTE_DISTANCE)
55 #endif
56 #ifndef RECLAIM_DISTANCE
57 /*
58 * If the distance between nodes in a system is larger than RECLAIM_DISTANCE
59 * (in whatever arch specific measurement units returned by node_distance())
60 * then switch on zone reclaim on boot.
61 */
62 #define RECLAIM_DISTANCE 20
63 #endif
64 #ifndef PENALTY_FOR_NODE_WITH_CPUS
65 #define PENALTY_FOR_NODE_WITH_CPUS (1)
66 #endif
68 /*
69 * Below are the 3 major initializers used in building sched_domains:
70 * SD_SIBLING_INIT, for SMT domains
71 * SD_CPU_INIT, for SMP domains
72 * SD_NODE_INIT, for NUMA domains
73 *
74 * Any architecture that cares to do any tuning to these values should do so
75 * by defining their own arch-specific initializer in include/asm/topology.h.
76 * A definition there will automagically override these default initializers
77 * and allow arch-specific performance tuning of sched_domains.
78 * (Only non-zero and non-null fields need be specified.)
79 */
81 #ifdef CONFIG_SCHED_SMT
82 /* MCD - Do we really need this? It is always on if CONFIG_SCHED_SMT is,
83 * so can't we drop this in favor of CONFIG_SCHED_SMT?
84 */
85 #define ARCH_HAS_SCHED_WAKE_IDLE
86 /* Common values for SMT siblings */
87 #ifndef SD_SIBLING_INIT
88 #define SD_SIBLING_INIT (struct sched_domain) { \
89 .min_interval = 1, \
90 .max_interval = 2, \
91 .busy_factor = 64, \
92 .imbalance_pct = 110, \
93 .flags = SD_LOAD_BALANCE \
94 | SD_BALANCE_NEWIDLE \
95 | SD_BALANCE_FORK \
96 | SD_BALANCE_EXEC \
97 | SD_WAKE_AFFINE \
98 | SD_WAKE_BALANCE \
99 | SD_SHARE_CPUPOWER, \
100 .last_balance = jiffies, \
101 .balance_interval = 1, \
102 }
103 #endif
106 #ifdef CONFIG_SCHED_MC
107 /* Common values for MC siblings. for now mostly derived from SD_CPU_INIT */
108 #ifndef SD_MC_INIT
109 #define SD_MC_INIT (struct sched_domain) { \
110 .min_interval = 1, \
111 .max_interval = 4, \
112 .busy_factor = 64, \
113 .imbalance_pct = 125, \
114 .cache_nice_tries = 1, \
115 .busy_idx = 2, \
116 .wake_idx = 1, \
117 .forkexec_idx = 1, \
118 .flags = SD_LOAD_BALANCE \
119 | SD_BALANCE_FORK \
120 | SD_BALANCE_EXEC \
121 | SD_WAKE_AFFINE \
122 | SD_WAKE_BALANCE \
123 | SD_SHARE_PKG_RESOURCES\
124 | sd_balance_for_mc_power()\
125 | sd_power_saving_flags(),\
126 .last_balance = jiffies, \
127 .balance_interval = 1, \
128 }
129 #endif
132 /* Common values for CPUs */
133 #ifndef SD_CPU_INIT
134 #define SD_CPU_INIT (struct sched_domain) { \
135 .min_interval = 1, \
136 .max_interval = 4, \
137 .busy_factor = 64, \
138 .imbalance_pct = 125, \
139 .cache_nice_tries = 1, \
140 .busy_idx = 2, \
141 .idle_idx = 1, \
142 .newidle_idx = 2, \
143 .wake_idx = 1, \
144 .forkexec_idx = 1, \
145 .flags = SD_LOAD_BALANCE \
146 | SD_BALANCE_EXEC \
147 | SD_BALANCE_FORK \
148 | SD_WAKE_AFFINE \
149 | SD_WAKE_BALANCE \
150 | sd_balance_for_package_power()\
151 | sd_power_saving_flags(),\
152 .last_balance = jiffies, \
153 .balance_interval = 1, \
154 }
155 #endif
157 /* sched_domains SD_ALLNODES_INIT for NUMA machines */
158 #define SD_ALLNODES_INIT (struct sched_domain) { \
159 .min_interval = 64, \
160 .max_interval = 64*num_online_cpus(), \
161 .busy_factor = 128, \
162 .imbalance_pct = 133, \
163 .cache_nice_tries = 1, \
164 .busy_idx = 3, \
165 .idle_idx = 3, \
166 .flags = SD_LOAD_BALANCE \
167 | SD_BALANCE_NEWIDLE \
168 | SD_WAKE_AFFINE \
169 | SD_SERIALIZE, \
170 .last_balance = jiffies, \
171 .balance_interval = 64, \
172 }
174 #ifdef CONFIG_NUMA
175 #ifndef SD_NODE_INIT
176 #error Please define an appropriate SD_NODE_INIT in include/asm/topology.h!!!
177 #endif
180 #ifndef topology_physical_package_id
181 #define topology_physical_package_id(cpu) ((void)(cpu), -1)
182 #endif
183 #ifndef topology_core_id
184 #define topology_core_id(cpu) ((void)(cpu), 0)
185 #endif
186 #ifndef topology_thread_siblings
187 #define topology_thread_siblings(cpu) cpumask_of_cpu(cpu)
188 #endif
189 #ifndef topology_core_siblings
190 #define topology_core_siblings(cpu) cpumask_of_cpu(cpu)
191 #endif
192 #ifndef topology_thread_cpumask
193 #define topology_thread_cpumask(cpu) cpumask_of(cpu)
194 #endif
195 #ifndef topology_core_cpumask
196 #define topology_core_cpumask(cpu) cpumask_of(cpu)
197 #endif
199 /* Returns the number of the current Node. */
200 #ifndef numa_node_id
201 #define numa_node_id() (cpu_to_node(raw_smp_processor_id()))
202 #endif