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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 30 |
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 | * |
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 | | 1*SD_SHARE_PKG_RESOURCES \ |
102 | | 0*SD_SERIALIZE \ |
103 | | 0*SD_PREFER_SIBLING \ |
104 | | arch_sd_sibling_asym_packing() \ |
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_SHARE_CPUPOWER \ |
133 | | 1*SD_SHARE_PKG_RESOURCES \ |
134 | | 0*SD_SERIALIZE \ |
135 | , \ |
136 | .last_balance = jiffies, \ |
137 | .balance_interval = 1, \ |
138 | } |
139 | #endif |
140 | #endif /* CONFIG_SCHED_MC */ |
141 | |
142 | /* Common values for CPUs */ |
143 | #ifndef SD_CPU_INIT |
144 | #define SD_CPU_INIT (struct sched_domain) { \ |
145 | .min_interval = 1, \ |
146 | .max_interval = 4, \ |
147 | .busy_factor = 64, \ |
148 | .imbalance_pct = 125, \ |
149 | .cache_nice_tries = 1, \ |
150 | .busy_idx = 2, \ |
151 | .idle_idx = 1, \ |
152 | .newidle_idx = 0, \ |
153 | .wake_idx = 0, \ |
154 | .forkexec_idx = 0, \ |
155 | \ |
156 | .flags = 1*SD_LOAD_BALANCE \ |
157 | | 1*SD_BALANCE_NEWIDLE \ |
158 | | 1*SD_BALANCE_EXEC \ |
159 | | 1*SD_BALANCE_FORK \ |
160 | | 0*SD_BALANCE_WAKE \ |
161 | | 1*SD_WAKE_AFFINE \ |
162 | | 0*SD_SHARE_CPUPOWER \ |
163 | | 0*SD_SHARE_PKG_RESOURCES \ |
164 | | 0*SD_SERIALIZE \ |
165 | | 1*SD_PREFER_SIBLING \ |
166 | , \ |
167 | .last_balance = jiffies, \ |
168 | .balance_interval = 1, \ |
169 | } |
170 | #endif |
171 | |
172 | #ifdef CONFIG_SCHED_BOOK |
173 | #ifndef SD_BOOK_INIT |
174 | #error Please define an appropriate SD_BOOK_INIT in include/asm/topology.h!!! |
175 | #endif |
176 | #endif /* CONFIG_SCHED_BOOK */ |
177 | |
178 | #ifdef CONFIG_USE_PERCPU_NUMA_NODE_ID |
179 | DECLARE_PER_CPU(int, numa_node); |
180 | |
181 | #ifndef numa_node_id |
182 | /* Returns the number of the current Node. */ |
183 | static inline int numa_node_id(void) |
184 | { |
185 | return __this_cpu_read(numa_node); |
186 | } |
187 | #endif |
188 | |
189 | #ifndef cpu_to_node |
190 | static inline int cpu_to_node(int cpu) |
191 | { |
192 | return per_cpu(numa_node, cpu); |
193 | } |
194 | #endif |
195 | |
196 | #ifndef set_numa_node |
197 | static inline void set_numa_node(int node) |
198 | { |
199 | this_cpu_write(numa_node, node); |
200 | } |
201 | #endif |
202 | |
203 | #ifndef set_cpu_numa_node |
204 | static inline void set_cpu_numa_node(int cpu, int node) |
205 | { |
206 | per_cpu(numa_node, cpu) = node; |
207 | } |
208 | #endif |
209 | |
210 | #else /* !CONFIG_USE_PERCPU_NUMA_NODE_ID */ |
211 | |
212 | /* Returns the number of the current Node. */ |
213 | #ifndef numa_node_id |
214 | static inline int numa_node_id(void) |
215 | { |
216 | return cpu_to_node(raw_smp_processor_id()); |
217 | } |
218 | #endif |
219 | |
220 | #endif /* [!]CONFIG_USE_PERCPU_NUMA_NODE_ID */ |
221 | |
222 | #ifdef CONFIG_HAVE_MEMORYLESS_NODES |
223 | |
224 | /* |
225 | * N.B., Do NOT reference the '_numa_mem_' per cpu variable directly. |
226 | * It will not be defined when CONFIG_HAVE_MEMORYLESS_NODES is not defined. |
227 | * Use the accessor functions set_numa_mem(), numa_mem_id() and cpu_to_mem(). |
228 | */ |
229 | DECLARE_PER_CPU(int, _numa_mem_); |
230 | |
231 | #ifndef set_numa_mem |
232 | static inline void set_numa_mem(int node) |
233 | { |
234 | this_cpu_write(_numa_mem_, node); |
235 | } |
236 | #endif |
237 | |
238 | #ifndef numa_mem_id |
239 | /* Returns the number of the nearest Node with memory */ |
240 | static inline int numa_mem_id(void) |
241 | { |
242 | return __this_cpu_read(_numa_mem_); |
243 | } |
244 | #endif |
245 | |
246 | #ifndef cpu_to_mem |
247 | static inline int cpu_to_mem(int cpu) |
248 | { |
249 | return per_cpu(_numa_mem_, cpu); |
250 | } |
251 | #endif |
252 | |
253 | #ifndef set_cpu_numa_mem |
254 | static inline void set_cpu_numa_mem(int cpu, int node) |
255 | { |
256 | per_cpu(_numa_mem_, cpu) = node; |
257 | } |
258 | #endif |
259 | |
260 | #else /* !CONFIG_HAVE_MEMORYLESS_NODES */ |
261 | |
262 | #ifndef numa_mem_id |
263 | /* Returns the number of the nearest Node with memory */ |
264 | static inline int numa_mem_id(void) |
265 | { |
266 | return numa_node_id(); |
267 | } |
268 | #endif |
269 | |
270 | #ifndef cpu_to_mem |
271 | static inline int cpu_to_mem(int cpu) |
272 | { |
273 | return cpu_to_node(cpu); |
274 | } |
275 | #endif |
276 | |
277 | #endif /* [!]CONFIG_HAVE_MEMORYLESS_NODES */ |
278 | |
279 | #ifndef topology_physical_package_id |
280 | #define topology_physical_package_id(cpu) ((void)(cpu), -1) |
281 | #endif |
282 | #ifndef topology_core_id |
283 | #define topology_core_id(cpu) ((void)(cpu), 0) |
284 | #endif |
285 | #ifndef topology_thread_cpumask |
286 | #define topology_thread_cpumask(cpu) cpumask_of(cpu) |
287 | #endif |
288 | #ifndef topology_core_cpumask |
289 | #define topology_core_cpumask(cpu) cpumask_of(cpu) |
290 | #endif |
291 | |
292 | #endif /* _LINUX_TOPOLOGY_H */ |
293 |
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