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[linux-2.6/next.git] / include / linux / topology.h
blobc44df50a05ab5a81e42b1a37299fb9e790298fc3
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 <linux/percpu.h>
35 #include <asm/topology.h>
36
37 #ifndef node_has_online_mem
38 #define node_has_online_mem(nid) (1)
39 #endif
40
41 #ifndef nr_cpus_node
42 #define nr_cpus_node(node) cpumask_weight(cpumask_of_node(node))
43 #endif
44
45 #define for_each_node_with_cpus(node) \
46 for_each_online_node(node) \
47 if (nr_cpus_node(node))
48
49 int arch_update_cpu_topology(void);
50
51 /* Conform to ACPI 2.0 SLIT distance definitions */
52 #define LOCAL_DISTANCE 10
53 #define REMOTE_DISTANCE 20
54 #ifndef node_distance
55 #define node_distance(from,to) ((from) == (to) ? LOCAL_DISTANCE : REMOTE_DISTANCE)
56 #endif
57 #ifndef RECLAIM_DISTANCE
58 /*
59 * If the distance between nodes in a system is larger than RECLAIM_DISTANCE
60 * (in whatever arch specific measurement units returned by node_distance())
61 * then switch on zone reclaim on boot.
62 */
63 #define RECLAIM_DISTANCE 20
64 #endif
65 #ifndef PENALTY_FOR_NODE_WITH_CPUS
66 #define PENALTY_FOR_NODE_WITH_CPUS (1)
67 #endif
68
69 /*
70 * Below are the 3 major initializers used in building sched_domains:
71 * SD_SIBLING_INIT, for SMT domains
72 * SD_CPU_INIT, for SMP domains
73 * SD_NODE_INIT, for NUMA domains
74 *
75 * Any architecture that cares to do any tuning to these values should do so
76 * by defining their own arch-specific initializer in include/asm/topology.h.
77 * A definition there will automagically override these default initializers
78 * and allow arch-specific performance tuning of sched_domains.
79 * (Only non-zero and non-null fields need be specified.)
80 */
81
82 #ifdef CONFIG_SCHED_SMT
83 /* MCD - Do we really need this? It is always on if CONFIG_SCHED_SMT is,
84 * so can't we drop this in favor of CONFIG_SCHED_SMT?
85 */
86 #define ARCH_HAS_SCHED_WAKE_IDLE
87 /* Common values for SMT siblings */
88 #ifndef SD_SIBLING_INIT
89 #define SD_SIBLING_INIT (struct sched_domain) { \
90 .min_interval = 1, \
91 .max_interval = 2, \
92 .busy_factor = 64, \
93 .imbalance_pct = 110, \
94 \
95 .flags = 1*SD_LOAD_BALANCE \
96 | 1*SD_BALANCE_NEWIDLE \
97 | 1*SD_BALANCE_EXEC \
98 | 1*SD_BALANCE_FORK \
99 | 0*SD_BALANCE_WAKE \
100 | 1*SD_WAKE_AFFINE \
101 | 1*SD_SHARE_CPUPOWER \
102 | 0*SD_POWERSAVINGS_BALANCE \
103 | 1*SD_SHARE_PKG_RESOURCES \
104 | 0*SD_SERIALIZE \
105 | 0*SD_PREFER_SIBLING \
106 , \
107 .last_balance = jiffies, \
108 .balance_interval = 1, \
109 .smt_gain = 1178, /* 15% */ \
110 }
111 #endif
112 #endif /* CONFIG_SCHED_SMT */
113
114 #ifdef CONFIG_SCHED_MC
115 /* Common values for MC siblings. for now mostly derived from SD_CPU_INIT */
116 #ifndef SD_MC_INIT
117 #define SD_MC_INIT (struct sched_domain) { \
118 .min_interval = 1, \
119 .max_interval = 4, \
120 .busy_factor = 64, \
121 .imbalance_pct = 125, \
122 .cache_nice_tries = 1, \
123 .busy_idx = 2, \
124 .wake_idx = 0, \
125 .forkexec_idx = 0, \
126 \
127 .flags = 1*SD_LOAD_BALANCE \
128 | 1*SD_BALANCE_NEWIDLE \
129 | 1*SD_BALANCE_EXEC \
130 | 1*SD_BALANCE_FORK \
131 | 0*SD_BALANCE_WAKE \
132 | 1*SD_WAKE_AFFINE \
133 | 0*SD_PREFER_LOCAL \
134 | 0*SD_SHARE_CPUPOWER \
135 | 1*SD_SHARE_PKG_RESOURCES \
136 | 0*SD_SERIALIZE \
137 | sd_balance_for_mc_power() \
138 | sd_power_saving_flags() \
139 , \
140 .last_balance = jiffies, \
141 .balance_interval = 1, \
142 }
143 #endif
144 #endif /* CONFIG_SCHED_MC */
145
146 /* Common values for CPUs */
147 #ifndef SD_CPU_INIT
148 #define SD_CPU_INIT (struct sched_domain) { \
149 .min_interval = 1, \
150 .max_interval = 4, \
151 .busy_factor = 64, \
152 .imbalance_pct = 125, \
153 .cache_nice_tries = 1, \
154 .busy_idx = 2, \
155 .idle_idx = 1, \
156 .newidle_idx = 0, \
157 .wake_idx = 0, \
158 .forkexec_idx = 0, \
159 \
160 .flags = 1*SD_LOAD_BALANCE \
161 | 1*SD_BALANCE_NEWIDLE \
162 | 1*SD_BALANCE_EXEC \
163 | 1*SD_BALANCE_FORK \
164 | 0*SD_BALANCE_WAKE \
165 | 1*SD_WAKE_AFFINE \
166 | 0*SD_PREFER_LOCAL \
167 | 0*SD_SHARE_CPUPOWER \
168 | 0*SD_SHARE_PKG_RESOURCES \
169 | 0*SD_SERIALIZE \
170 | sd_balance_for_package_power() \
171 | sd_power_saving_flags() \
172 , \
173 .last_balance = jiffies, \
174 .balance_interval = 1, \
175 }
176 #endif
177
178 /* sched_domains SD_ALLNODES_INIT for NUMA machines */
179 #define SD_ALLNODES_INIT (struct sched_domain) { \
180 .min_interval = 64, \
181 .max_interval = 64*num_online_cpus(), \
182 .busy_factor = 128, \
183 .imbalance_pct = 133, \
184 .cache_nice_tries = 1, \
185 .busy_idx = 3, \
186 .idle_idx = 3, \
187 .flags = 1*SD_LOAD_BALANCE \
188 | 1*SD_BALANCE_NEWIDLE \
189 | 0*SD_BALANCE_EXEC \
190 | 0*SD_BALANCE_FORK \
191 | 0*SD_BALANCE_WAKE \
192 | 0*SD_WAKE_AFFINE \
193 | 0*SD_SHARE_CPUPOWER \
194 | 0*SD_POWERSAVINGS_BALANCE \
195 | 0*SD_SHARE_PKG_RESOURCES \
196 | 1*SD_SERIALIZE \
197 | 0*SD_PREFER_SIBLING \
198 , \
199 .last_balance = jiffies, \
200 .balance_interval = 64, \
201 }
202
203 #ifdef CONFIG_NUMA
204 #ifndef SD_NODE_INIT
205 #error Please define an appropriate SD_NODE_INIT in include/asm/topology.h!!!
206 #endif
207
208 #endif /* CONFIG_NUMA */
209
210 #ifdef CONFIG_USE_PERCPU_NUMA_NODE_ID
211 DECLARE_PER_CPU(int, numa_node);
212
213 #ifndef numa_node_id
214 /* Returns the number of the current Node. */
215 static inline int numa_node_id(void)
216 {
217 return __this_cpu_read(numa_node);
218 }
219 #endif
220
221 #ifndef cpu_to_node
222 static inline int cpu_to_node(int cpu)
223 {
224 return per_cpu(numa_node, cpu);
225 }
226 #endif
227
228 #ifndef set_numa_node
229 static inline void set_numa_node(int node)
230 {
231 percpu_write(numa_node, node);
232 }
233 #endif
234
235 #ifndef set_cpu_numa_node
236 static inline void set_cpu_numa_node(int cpu, int node)
237 {
238 per_cpu(numa_node, cpu) = node;
239 }
240 #endif
241
242 #else /* !CONFIG_USE_PERCPU_NUMA_NODE_ID */
243
244 /* Returns the number of the current Node. */
245 #ifndef numa_node_id
246 static inline int numa_node_id(void)
247 {
248 return cpu_to_node(raw_smp_processor_id());
249 }
250 #endif
251
252 #endif /* [!]CONFIG_USE_PERCPU_NUMA_NODE_ID */
253
254 #ifdef CONFIG_HAVE_MEMORYLESS_NODES
255
256 /*
257 * N.B., Do NOT reference the '_numa_mem_' per cpu variable directly.
258 * It will not be defined when CONFIG_HAVE_MEMORYLESS_NODES is not defined.
259 * Use the accessor functions set_numa_mem(), numa_mem_id() and cpu_to_mem().
260 */
261 DECLARE_PER_CPU(int, _numa_mem_);
262
263 #ifndef set_numa_mem
264 static inline void set_numa_mem(int node)
265 {
266 percpu_write(_numa_mem_, node);
267 }
268 #endif
269
270 #ifndef numa_mem_id
271 /* Returns the number of the nearest Node with memory */
272 static inline int numa_mem_id(void)
273 {
274 return __this_cpu_read(_numa_mem_);
275 }
276 #endif
277
278 #ifndef cpu_to_mem
279 static inline int cpu_to_mem(int cpu)
280 {
281 return per_cpu(_numa_mem_, cpu);
282 }
283 #endif
284
285 #ifndef set_cpu_numa_mem
286 static inline void set_cpu_numa_mem(int cpu, int node)
287 {
288 per_cpu(_numa_mem_, cpu) = node;
289 }
290 #endif
291
292 #else /* !CONFIG_HAVE_MEMORYLESS_NODES */
293
294 static inline void set_numa_mem(int node) {}
295
296 static inline void set_cpu_numa_mem(int cpu, int node) {}
297
298 #ifndef numa_mem_id
299 /* Returns the number of the nearest Node with memory */
300 static inline int numa_mem_id(void)
301 {
302 return numa_node_id();
303 }
304 #endif
305
306 #ifndef cpu_to_mem
307 static inline int cpu_to_mem(int cpu)
308 {
309 return cpu_to_node(cpu);
310 }
311 #endif
312
313 #endif /* [!]CONFIG_HAVE_MEMORYLESS_NODES */
314
315 #ifndef topology_physical_package_id
316 #define topology_physical_package_id(cpu) ((void)(cpu), -1)
317 #endif
318 #ifndef topology_core_id
319 #define topology_core_id(cpu) ((void)(cpu), 0)
320 #endif
321 #ifndef topology_thread_cpumask
322 #define topology_thread_cpumask(cpu) cpumask_of(cpu)
323 #endif
324 #ifndef topology_core_cpumask
325 #define topology_core_cpumask(cpu) cpumask_of(cpu)
326 #endif
327
328 #endif /* _LINUX_TOPOLOGY_H */
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