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Linux kernel mirror (for testing)
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linux
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
48int 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 | 0*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 */