netlink: fix NETLINK_RECV_NO_ENOBUFS in netlink_set_err()
[linux-2.6.git] / include / linux / topology.h
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 */