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1da177e4 LT |
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) \ | |
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 | |
9eeff239 CL |
59 | #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 | |
1da177e4 LT |
67 | #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, \ | |
1da177e4 LT |
97 | .cache_nice_tries = 0, \ |
98 | .per_cpu_gain = 25, \ | |
7897986b NP |
99 | .busy_idx = 0, \ |
100 | .idle_idx = 0, \ | |
687f1661 | 101 | .newidle_idx = 1, \ |
7897986b | 102 | .wake_idx = 0, \ |
147cbb4b | 103 | .forkexec_idx = 0, \ |
1da177e4 LT |
104 | .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, \ | |
1da177e4 LT |
127 | .cache_nice_tries = 1, \ |
128 | .per_cpu_gain = 100, \ | |
7897986b | 129 | .busy_idx = 2, \ |
687f1661 NP |
130 | .idle_idx = 1, \ |
131 | .newidle_idx = 2, \ | |
7897986b | 132 | .wake_idx = 1, \ |
687f1661 | 133 | .forkexec_idx = 1, \ |
1da177e4 LT |
134 | .flags = SD_LOAD_BALANCE \ |
135 | | SD_BALANCE_NEWIDLE \ | |
136 | | SD_BALANCE_EXEC \ | |
687f1661 | 137 | | SD_WAKE_AFFINE, \ |
1da177e4 LT |
138 | .last_balance = jiffies, \ |
139 | .balance_interval = 1, \ | |
140 | .nr_balance_failed = 0, \ | |
141 | } | |
142 | #endif | |
143 | ||
9c1cfda2 JH |
144 | /* 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 | ||
1e9f28fa SS |
167 | #ifdef CONFIG_SCHED_MC |
168 | #ifndef SD_MC_INIT | |
169 | /* for now its same as SD_CPU_INIT. | |
170 | * TBD: Tune Domain parameters! | |
171 | */ | |
172 | #define SD_MC_INIT SD_CPU_INIT | |
173 | #endif | |
174 | #endif | |
175 | ||
1da177e4 LT |
176 | #ifdef CONFIG_NUMA |
177 | #ifndef SD_NODE_INIT | |
178 | #error Please define an appropriate SD_NODE_INIT in include/asm/topology.h!!! | |
179 | #endif | |
180 | #endif /* CONFIG_NUMA */ | |
181 | ||
182 | #endif /* _LINUX_TOPOLOGY_H */ |