2 * include/linux/topology.h
4 * Written by: Matthew Dobson, IBM Corporation
6 * Copyright (C) 2002, IBM Corp.
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.
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
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.
25 * Send feedback to <colpatch@us.ibm.com>
27 #ifndef _LINUX_TOPOLOGY_H
28 #define _LINUX_TOPOLOGY_H
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>
37 #ifndef node_has_online_mem
38 #define node_has_online_mem(nid) (1)
42 #define nr_cpus_node(node) cpumask_weight(cpumask_of_node(node))
45 #define for_each_node_with_cpus(node) \
46 for_each_online_node(node) \
47 if (nr_cpus_node(node))
49 int arch_update_cpu_topology(void);
51 /* Conform to ACPI 2.0 SLIT distance definitions */
52 #define LOCAL_DISTANCE 10
53 #define REMOTE_DISTANCE 20
55 #define node_distance(from,to) ((from) == (to) ? LOCAL_DISTANCE : REMOTE_DISTANCE)
57 #ifndef RECLAIM_DISTANCE
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.
63 #define RECLAIM_DISTANCE 30
65 #ifndef PENALTY_FOR_NODE_WITH_CPUS
66 #define PENALTY_FOR_NODE_WITH_CPUS (1)
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
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.)
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?
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) { \
92 .imbalance_pct = 110, \
94 .flags = 1*SD_LOAD_BALANCE \
95 | 1*SD_BALANCE_NEWIDLE \
100 | 1*SD_SHARE_CPUPOWER \
101 | 1*SD_SHARE_PKG_RESOURCES \
103 | 0*SD_PREFER_SIBLING \
104 | arch_sd_sibling_asym_packing() \
106 .last_balance = jiffies, \
107 .balance_interval = 1, \
108 .smt_gain = 1178, /* 15% */ \
111 #endif /* CONFIG_SCHED_SMT */
113 #ifdef CONFIG_SCHED_MC
114 /* Common values for MC siblings. for now mostly derived from SD_CPU_INIT */
116 #define SD_MC_INIT (struct sched_domain) { \
120 .imbalance_pct = 125, \
121 .cache_nice_tries = 1, \
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 \
132 | 0*SD_SHARE_CPUPOWER \
133 | 1*SD_SHARE_PKG_RESOURCES \
136 .last_balance = jiffies, \
137 .balance_interval = 1, \
140 #endif /* CONFIG_SCHED_MC */
142 /* Common values for CPUs */
144 #define SD_CPU_INIT (struct sched_domain) { \
148 .imbalance_pct = 125, \
149 .cache_nice_tries = 1, \
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 \
162 | 0*SD_SHARE_CPUPOWER \
163 | 0*SD_SHARE_PKG_RESOURCES \
165 | 1*SD_PREFER_SIBLING \
167 .last_balance = jiffies, \
168 .balance_interval = 1, \
172 #ifdef CONFIG_SCHED_BOOK
174 #error Please define an appropriate SD_BOOK_INIT in include/asm/topology.h!!!
176 #endif /* CONFIG_SCHED_BOOK */
178 #ifdef CONFIG_USE_PERCPU_NUMA_NODE_ID
179 DECLARE_PER_CPU(int, numa_node
);
182 /* Returns the number of the current Node. */
183 static inline int numa_node_id(void)
185 return __this_cpu_read(numa_node
);
190 static inline int cpu_to_node(int cpu
)
192 return per_cpu(numa_node
, cpu
);
196 #ifndef set_numa_node
197 static inline void set_numa_node(int node
)
199 this_cpu_write(numa_node
, node
);
203 #ifndef set_cpu_numa_node
204 static inline void set_cpu_numa_node(int cpu
, int node
)
206 per_cpu(numa_node
, cpu
) = node
;
210 #else /* !CONFIG_USE_PERCPU_NUMA_NODE_ID */
212 /* Returns the number of the current Node. */
214 static inline int numa_node_id(void)
216 return cpu_to_node(raw_smp_processor_id());
220 #endif /* [!]CONFIG_USE_PERCPU_NUMA_NODE_ID */
222 #ifdef CONFIG_HAVE_MEMORYLESS_NODES
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().
229 DECLARE_PER_CPU(int, _numa_mem_
);
232 static inline void set_numa_mem(int node
)
234 this_cpu_write(_numa_mem_
, node
);
239 /* Returns the number of the nearest Node with memory */
240 static inline int numa_mem_id(void)
242 return __this_cpu_read(_numa_mem_
);
247 static inline int cpu_to_mem(int cpu
)
249 return per_cpu(_numa_mem_
, cpu
);
253 #ifndef set_cpu_numa_mem
254 static inline void set_cpu_numa_mem(int cpu
, int node
)
256 per_cpu(_numa_mem_
, cpu
) = node
;
260 #else /* !CONFIG_HAVE_MEMORYLESS_NODES */
263 /* Returns the number of the nearest Node with memory */
264 static inline int numa_mem_id(void)
266 return numa_node_id();
271 static inline int cpu_to_mem(int cpu
)
273 return cpu_to_node(cpu
);
277 #endif /* [!]CONFIG_HAVE_MEMORYLESS_NODES */
279 #ifndef topology_physical_package_id
280 #define topology_physical_package_id(cpu) ((void)(cpu), -1)
282 #ifndef topology_core_id
283 #define topology_core_id(cpu) ((void)(cpu), 0)
285 #ifndef topology_thread_cpumask
286 #define topology_thread_cpumask(cpu) cpumask_of(cpu)
288 #ifndef topology_core_cpumask
289 #define topology_core_cpumask(cpu) cpumask_of(cpu)
292 #endif /* _LINUX_TOPOLOGY_H */
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