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. */
numa_node_id(void)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
cpu_to_node(int cpu)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
set_numa_node(int 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
set_cpu_numa_node(int cpu,int 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
numa_node_id(void)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
set_numa_mem(int node)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 */
numa_mem_id(void)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
cpu_to_mem(int cpu)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
set_cpu_numa_mem(int cpu,int node)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 */
numa_mem_id(void)264 static inline int numa_mem_id(void)
265 {
266 return numa_node_id();
267 }
268 #endif
269
270 #ifndef cpu_to_mem
cpu_to_mem(int cpu)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