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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 <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 | |
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 */ |
227 |
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