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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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) \
42 ({ \
43 cpumask_t __tmp__; \
44 __tmp__ = node_to_cpumask(node); \
45 cpus_weight(__tmp__); \
46 })
47#endif
48
49#define for_each_node_with_cpus(node) \
50 for_each_online_node(node) \
51 if (nr_cpus_node(node))
52
53#ifndef node_distance
54/* Conform to ACPI 2.0 SLIT distance definitions */
55#define LOCAL_DISTANCE 10
56#define REMOTE_DISTANCE 20
57#define node_distance(from,to) ((from) == (to) ? LOCAL_DISTANCE : REMOTE_DISTANCE)
58#endif
Christoph Lameter9eeff232006-01-18 17:42:31 -080059#ifndef RECLAIM_DISTANCE
60/*
61 * If the distance between nodes in a system is larger than RECLAIM_DISTANCE
62 * (in whatever arch specific measurement units returned by node_distance())
63 * then switch on zone reclaim on boot.
64 */
65#define RECLAIM_DISTANCE 20
66#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070067#ifndef PENALTY_FOR_NODE_WITH_CPUS
68#define PENALTY_FOR_NODE_WITH_CPUS (1)
69#endif
70
71/*
72 * Below are the 3 major initializers used in building sched_domains:
73 * SD_SIBLING_INIT, for SMT domains
74 * SD_CPU_INIT, for SMP domains
75 * SD_NODE_INIT, for NUMA domains
76 *
77 * Any architecture that cares to do any tuning to these values should do so
78 * by defining their own arch-specific initializer in include/asm/topology.h.
79 * A definition there will automagically override these default initializers
80 * and allow arch-specific performance tuning of sched_domains.
81 */
82#ifdef CONFIG_SCHED_SMT
83/* MCD - Do we really need this? It is always on if CONFIG_SCHED_SMT is,
84 * so can't we drop this in favor of CONFIG_SCHED_SMT?
85 */
86#define ARCH_HAS_SCHED_WAKE_IDLE
87/* Common values for SMT siblings */
88#ifndef SD_SIBLING_INIT
89#define SD_SIBLING_INIT (struct sched_domain) { \
90 .span = CPU_MASK_NONE, \
91 .parent = NULL, \
92 .groups = NULL, \
93 .min_interval = 1, \
94 .max_interval = 2, \
95 .busy_factor = 8, \
96 .imbalance_pct = 110, \
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 .cache_nice_tries = 0, \
98 .per_cpu_gain = 25, \
Nick Piggin78979862005-06-25 14:57:13 -070099 .busy_idx = 0, \
100 .idle_idx = 0, \
Nick Piggin687f1662005-06-25 14:57:21 -0700101 .newidle_idx = 1, \
Nick Piggin78979862005-06-25 14:57:13 -0700102 .wake_idx = 0, \
Nick Piggin147cbb42005-06-25 14:57:19 -0700103 .forkexec_idx = 0, \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 .flags = SD_LOAD_BALANCE \
105 | SD_BALANCE_NEWIDLE \
106 | SD_BALANCE_EXEC \
107 | SD_WAKE_AFFINE \
108 | SD_WAKE_IDLE \
109 | SD_SHARE_CPUPOWER, \
110 .last_balance = jiffies, \
111 .balance_interval = 1, \
112 .nr_balance_failed = 0, \
113}
114#endif
115#endif /* CONFIG_SCHED_SMT */
116
117/* Common values for CPUs */
118#ifndef SD_CPU_INIT
119#define SD_CPU_INIT (struct sched_domain) { \
120 .span = CPU_MASK_NONE, \
121 .parent = NULL, \
122 .groups = NULL, \
123 .min_interval = 1, \
124 .max_interval = 4, \
125 .busy_factor = 64, \
126 .imbalance_pct = 125, \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 .cache_nice_tries = 1, \
128 .per_cpu_gain = 100, \
Nick Piggin78979862005-06-25 14:57:13 -0700129 .busy_idx = 2, \
Nick Piggin687f1662005-06-25 14:57:21 -0700130 .idle_idx = 1, \
131 .newidle_idx = 2, \
Nick Piggin78979862005-06-25 14:57:13 -0700132 .wake_idx = 1, \
Nick Piggin687f1662005-06-25 14:57:21 -0700133 .forkexec_idx = 1, \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 .flags = SD_LOAD_BALANCE \
135 | SD_BALANCE_NEWIDLE \
136 | SD_BALANCE_EXEC \
Nick Piggin687f1662005-06-25 14:57:21 -0700137 | SD_WAKE_AFFINE, \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 .last_balance = jiffies, \
139 .balance_interval = 1, \
140 .nr_balance_failed = 0, \
141}
142#endif
143
John Hawkes9c1cfda2005-09-06 15:18:14 -0700144/* sched_domains SD_ALLNODES_INIT for NUMA machines */
145#define SD_ALLNODES_INIT (struct sched_domain) { \
146 .span = CPU_MASK_NONE, \
147 .parent = NULL, \
148 .groups = NULL, \
149 .min_interval = 64, \
150 .max_interval = 64*num_online_cpus(), \
151 .busy_factor = 128, \
152 .imbalance_pct = 133, \
153 .cache_hot_time = (10*1000000), \
154 .cache_nice_tries = 1, \
155 .busy_idx = 3, \
156 .idle_idx = 3, \
157 .newidle_idx = 0, /* unused */ \
158 .wake_idx = 0, /* unused */ \
159 .forkexec_idx = 0, /* unused */ \
160 .per_cpu_gain = 100, \
161 .flags = SD_LOAD_BALANCE, \
162 .last_balance = jiffies, \
163 .balance_interval = 64, \
164 .nr_balance_failed = 0, \
165}
166
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167#ifdef CONFIG_NUMA
168#ifndef SD_NODE_INIT
169#error Please define an appropriate SD_NODE_INIT in include/asm/topology.h!!!
170#endif
171#endif /* CONFIG_NUMA */
172
173#endif /* _LINUX_TOPOLOGY_H */