Line data Source code
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) cpumask_weight(cpumask_of_node(node))
42 : #endif
43 :
44 : #define for_each_node_with_cpus(node) \
45 : for_each_online_node(node) \
46 : if (nr_cpus_node(node))
47 :
48 : int arch_update_cpu_topology(void);
49 1 :
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
67 :
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 : */
80 :
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 : \
94 : .flags = 1*SD_LOAD_BALANCE \
95 : | 1*SD_BALANCE_NEWIDLE \
96 : | 1*SD_BALANCE_EXEC \
97 : | 1*SD_BALANCE_FORK \
98 : | 0*SD_BALANCE_WAKE \
99 : | 1*SD_WAKE_AFFINE \
100 : | 1*SD_SHARE_CPUPOWER \
101 : | 0*SD_POWERSAVINGS_BALANCE \
102 : | 1*SD_SHARE_PKG_RESOURCES \
103 : | 0*SD_SERIALIZE \
104 : | 0*SD_PREFER_SIBLING \
105 : , \
106 : .last_balance = jiffies, \
107 : .balance_interval = 1, \
108 : .smt_gain = 1178, /* 15% */ \
109 : }
110 : #endif
111 : #endif /* CONFIG_SCHED_SMT */
112 :
113 : #ifdef CONFIG_SCHED_MC
114 : /* Common values for MC siblings. for now mostly derived from SD_CPU_INIT */
115 : #ifndef SD_MC_INIT
116 : #define SD_MC_INIT (struct sched_domain) { \
117 : .min_interval = 1, \
118 : .max_interval = 4, \
119 : .busy_factor = 64, \
120 : .imbalance_pct = 125, \
121 : .cache_nice_tries = 1, \
122 : .busy_idx = 2, \
123 : .wake_idx = 0, \
124 : .forkexec_idx = 0, \
125 : \
126 : .flags = 1*SD_LOAD_BALANCE \
127 : | 1*SD_BALANCE_NEWIDLE \
128 : | 1*SD_BALANCE_EXEC \
129 : | 1*SD_BALANCE_FORK \
130 : | 0*SD_BALANCE_WAKE \
131 : | 1*SD_WAKE_AFFINE \
132 : | 0*SD_PREFER_LOCAL \
133 : | 0*SD_SHARE_CPUPOWER \
134 : | 1*SD_SHARE_PKG_RESOURCES \
135 : | 0*SD_SERIALIZE \
136 : | sd_balance_for_mc_power() \
137 : | sd_power_saving_flags() \
138 : , \
139 : .last_balance = jiffies, \
140 : .balance_interval = 1, \
141 : }
142 : #endif
143 : #endif /* CONFIG_SCHED_MC */
144 :
145 : /* Common values for CPUs */
146 : #ifndef SD_CPU_INIT
147 : #define SD_CPU_INIT (struct sched_domain) { \
148 : .min_interval = 1, \
149 : .max_interval = 4, \
150 : .busy_factor = 64, \
151 : .imbalance_pct = 125, \
152 : .cache_nice_tries = 1, \
153 : .busy_idx = 2, \
154 : .idle_idx = 1, \
155 : .newidle_idx = 0, \
156 : .wake_idx = 0, \
157 : .forkexec_idx = 0, \
158 : \
159 : .flags = 1*SD_LOAD_BALANCE \
160 : | 1*SD_BALANCE_NEWIDLE \
161 : | 1*SD_BALANCE_EXEC \
162 : | 1*SD_BALANCE_FORK \
163 : | 0*SD_BALANCE_WAKE \
164 : | 1*SD_WAKE_AFFINE \
165 : | 0*SD_PREFER_LOCAL \
166 : | 0*SD_SHARE_CPUPOWER \
167 : | 0*SD_SHARE_PKG_RESOURCES \
168 : | 0*SD_SERIALIZE \
169 : | sd_balance_for_package_power() \
170 : | sd_power_saving_flags() \
171 : , \
172 : .last_balance = jiffies, \
173 : .balance_interval = 1, \
174 : }
175 : #endif
176 :
177 : /* sched_domains SD_ALLNODES_INIT for NUMA machines */
178 : #define SD_ALLNODES_INIT (struct sched_domain) { \
179 : .min_interval = 64, \
180 : .max_interval = 64*num_online_cpus(), \
181 : .busy_factor = 128, \
182 : .imbalance_pct = 133, \
183 : .cache_nice_tries = 1, \
184 : .busy_idx = 3, \
185 : .idle_idx = 3, \
186 : .flags = 1*SD_LOAD_BALANCE \
187 : | 1*SD_BALANCE_NEWIDLE \
188 : | 0*SD_BALANCE_EXEC \
189 : | 0*SD_BALANCE_FORK \
190 : | 0*SD_BALANCE_WAKE \
191 : | 0*SD_WAKE_AFFINE \
192 : | 0*SD_SHARE_CPUPOWER \
193 : | 0*SD_POWERSAVINGS_BALANCE \
194 : | 0*SD_SHARE_PKG_RESOURCES \
195 : | 1*SD_SERIALIZE \
196 : | 0*SD_PREFER_SIBLING \
197 : , \
198 : .last_balance = jiffies, \
199 : .balance_interval = 64, \
200 : }
201 :
202 : #ifdef CONFIG_NUMA
203 : #ifndef SD_NODE_INIT
204 : #error Please define an appropriate SD_NODE_INIT in include/asm/topology.h!!!
205 : #endif
206 : #endif /* CONFIG_NUMA */
207 :
208 : #ifndef topology_physical_package_id
209 : #define topology_physical_package_id(cpu) ((void)(cpu), -1)
210 : #endif
211 : #ifndef topology_core_id
212 : #define topology_core_id(cpu) ((void)(cpu), 0)
213 : #endif
214 : #ifndef topology_thread_cpumask
215 : #define topology_thread_cpumask(cpu) cpumask_of(cpu)
216 : #endif
217 : #ifndef topology_core_cpumask
218 : #define topology_core_cpumask(cpu) cpumask_of(cpu)
219 : #endif
220 :
221 : /* Returns the number of the current Node. */
222 : #ifndef numa_node_id
223 : #define numa_node_id() (cpu_to_node(raw_smp_processor_id()))
224 : #endif
225 :
226 : #endif /* _LINUX_TOPOLOGY_H */
|