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 * and zone_reclaim_mode is enabled then the VM will only call zone_reclaim()
62 * on nodes within this distance.
64 #define RECLAIM_DISTANCE 30
66 #ifndef PENALTY_FOR_NODE_WITH_CPUS
67 #define PENALTY_FOR_NODE_WITH_CPUS (1)
70 #ifdef CONFIG_USE_PERCPU_NUMA_NODE_ID
71 DECLARE_PER_CPU(int, numa_node
);
74 /* Returns the number of the current Node. */
75 static inline int numa_node_id(void)
77 return raw_cpu_read(numa_node
);
82 static inline int cpu_to_node(int cpu
)
84 return per_cpu(numa_node
, cpu
);
89 static inline void set_numa_node(int node
)
91 this_cpu_write(numa_node
, node
);
95 #ifndef set_cpu_numa_node
96 static inline void set_cpu_numa_node(int cpu
, int node
)
98 per_cpu(numa_node
, cpu
) = node
;
102 #else /* !CONFIG_USE_PERCPU_NUMA_NODE_ID */
104 /* Returns the number of the current Node. */
106 static inline int numa_node_id(void)
108 return cpu_to_node(raw_smp_processor_id());
112 #endif /* [!]CONFIG_USE_PERCPU_NUMA_NODE_ID */
114 #ifdef CONFIG_HAVE_MEMORYLESS_NODES
117 * N.B., Do NOT reference the '_numa_mem_' per cpu variable directly.
118 * It will not be defined when CONFIG_HAVE_MEMORYLESS_NODES is not defined.
119 * Use the accessor functions set_numa_mem(), numa_mem_id() and cpu_to_mem().
121 DECLARE_PER_CPU(int, _numa_mem_
);
124 static inline void set_numa_mem(int node
)
126 this_cpu_write(_numa_mem_
, node
);
131 /* Returns the number of the nearest Node with memory */
132 static inline int numa_mem_id(void)
134 return raw_cpu_read(_numa_mem_
);
139 static inline int cpu_to_mem(int cpu
)
141 return per_cpu(_numa_mem_
, cpu
);
145 #ifndef set_cpu_numa_mem
146 static inline void set_cpu_numa_mem(int cpu
, int node
)
148 per_cpu(_numa_mem_
, cpu
) = node
;
152 #else /* !CONFIG_HAVE_MEMORYLESS_NODES */
155 /* Returns the number of the nearest Node with memory */
156 static inline int numa_mem_id(void)
158 return numa_node_id();
163 static inline int cpu_to_mem(int cpu
)
165 return cpu_to_node(cpu
);
169 #endif /* [!]CONFIG_HAVE_MEMORYLESS_NODES */
171 #ifndef topology_physical_package_id
172 #define topology_physical_package_id(cpu) ((void)(cpu), -1)
174 #ifndef topology_core_id
175 #define topology_core_id(cpu) ((void)(cpu), 0)
177 #ifndef topology_thread_cpumask
178 #define topology_thread_cpumask(cpu) cpumask_of(cpu)
180 #ifndef topology_core_cpumask
181 #define topology_core_cpumask(cpu) cpumask_of(cpu)
184 #ifdef CONFIG_SCHED_SMT
185 static inline const struct cpumask
*cpu_smt_mask(int cpu
)
187 return topology_thread_cpumask(cpu
);
191 static inline const struct cpumask
*cpu_cpu_mask(int cpu
)
193 return cpumask_of_node(cpu_to_node(cpu
));
197 #endif /* _LINUX_TOPOLOGY_H */
This page took 0.035818 seconds and 6 git commands to generate.