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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 *
Ingo Molnar32525d02008-01-25 21:08:20 +01008 * All rights reserved.
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 *
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
Rusty Russella70f7302009-03-13 14:49:46 +103041#define nr_cpus_node(node) cpumask_weight(cpumask_of_node(node))
Linus Torvalds1da177e2005-04-16 15:20:36 -070042#endif
43
Mike Travis7c16ec52008-04-04 18:11:11 -070044#define for_each_node_with_cpus(node) \
45 for_each_online_node(node) \
Linus Torvalds1da177e2005-04-16 15:20:36 -070046 if (nr_cpus_node(node))
47
Heiko Carstensee79d1b2008-12-09 18:49:50 +010048int arch_update_cpu_topology(void);
Heiko Carstens22e52b02008-03-12 18:31:59 +010049
Linus Torvalds1da177e2005-04-16 15:20:36 -070050/* Conform to ACPI 2.0 SLIT distance definitions */
51#define LOCAL_DISTANCE 10
52#define REMOTE_DISTANCE 20
Ingo Molnarf787a5032007-07-11 21:21:47 +020053#ifndef node_distance
Linus Torvalds1da177e2005-04-16 15:20:36 -070054#define node_distance(from,to) ((from) == (to) ? LOCAL_DISTANCE : REMOTE_DISTANCE)
55#endif
Christoph Lameter9eeff232006-01-18 17:42:31 -080056#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
Linus Torvalds1da177e2005-04-16 15:20:36 -070064#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.
Mike Travis7c16ec52008-04-04 18:11:11 -070078 * (Only non-zero and non-null fields need be specified.)
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 */
Mike Travis7c16ec52008-04-04 18:11:11 -070080
Linus Torvalds1da177e2005-04-16 15:20:36 -070081#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
Ingo Molnar47734f82009-09-04 11:21:24 +020088#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 \
Peter Zijlstra182a85f2009-09-16 13:24:49 +020098 | 0*SD_BALANCE_WAKE \
Ingo Molnar47734f82009-09-04 11:21:24 +020099 | 1*SD_WAKE_AFFINE \
Ingo Molnar47734f82009-09-04 11:21:24 +0200100 | 1*SD_SHARE_CPUPOWER \
101 | 0*SD_POWERSAVINGS_BALANCE \
102 | 0*SD_SHARE_PKG_RESOURCES \
103 | 0*SD_SERIALIZE \
Ingo Molnar47734f82009-09-04 11:21:24 +0200104 | 0*SD_PREFER_SIBLING \
105 , \
106 .last_balance = jiffies, \
107 .balance_interval = 1, \
108 .smt_gain = 1178, /* 15% */ \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109}
110#endif
111#endif /* CONFIG_SCHED_SMT */
112
Siddha, Suresh B89c47102006-10-03 01:14:09 -0700113#ifdef CONFIG_SCHED_MC
114/* Common values for MC siblings. for now mostly derived from SD_CPU_INIT */
115#ifndef SD_MC_INIT
Ingo Molnar47734f82009-09-04 11:21:24 +0200116#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, \
Peter Zijlstra78e7ed52009-09-03 13:16:51 +0200123 .wake_idx = 0, \
Peter Zijlstrab8a543e2009-09-15 15:22:03 +0200124 .forkexec_idx = 0, \
Ingo Molnar47734f82009-09-04 11:21:24 +0200125 \
126 .flags = 1*SD_LOAD_BALANCE \
Ingo Molnar840a0652009-09-04 11:32:54 +0200127 | 1*SD_BALANCE_NEWIDLE \
Ingo Molnar47734f82009-09-04 11:21:24 +0200128 | 1*SD_BALANCE_EXEC \
129 | 1*SD_BALANCE_FORK \
Peter Zijlstra182a85f2009-09-16 13:24:49 +0200130 | 0*SD_BALANCE_WAKE \
Ingo Molnar47734f82009-09-04 11:21:24 +0200131 | 1*SD_WAKE_AFFINE \
Peter Zijlstra799e2202009-10-09 12:16:40 +0200132 | 0*SD_PREFER_LOCAL \
Ingo Molnar47734f82009-09-04 11:21:24 +0200133 | 0*SD_SHARE_CPUPOWER \
134 | 1*SD_SHARE_PKG_RESOURCES \
135 | 0*SD_SERIALIZE \
Ingo Molnar47734f82009-09-04 11:21:24 +0200136 | sd_balance_for_mc_power() \
137 | sd_power_saving_flags() \
138 , \
139 .last_balance = jiffies, \
140 .balance_interval = 1, \
Siddha, Suresh B89c47102006-10-03 01:14:09 -0700141}
142#endif
143#endif /* CONFIG_SCHED_MC */
144
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145/* Common values for CPUs */
146#ifndef SD_CPU_INIT
Ingo Molnar47734f82009-09-04 11:21:24 +0200147#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, \
Mike Galbraith0ec9fab2009-09-15 15:07:03 +0200155 .newidle_idx = 0, \
Peter Zijlstra78e7ed52009-09-03 13:16:51 +0200156 .wake_idx = 0, \
Peter Zijlstrab8a543e2009-09-15 15:22:03 +0200157 .forkexec_idx = 0, \
Ingo Molnar47734f82009-09-04 11:21:24 +0200158 \
159 .flags = 1*SD_LOAD_BALANCE \
Ingo Molnar840a0652009-09-04 11:32:54 +0200160 | 1*SD_BALANCE_NEWIDLE \
Ingo Molnar47734f82009-09-04 11:21:24 +0200161 | 1*SD_BALANCE_EXEC \
162 | 1*SD_BALANCE_FORK \
Peter Zijlstra182a85f2009-09-16 13:24:49 +0200163 | 0*SD_BALANCE_WAKE \
Peter Zijlstra6bd78212009-09-11 18:42:15 +0200164 | 1*SD_WAKE_AFFINE \
Peter Zijlstra799e2202009-10-09 12:16:40 +0200165 | 0*SD_PREFER_LOCAL \
Ingo Molnar47734f82009-09-04 11:21:24 +0200166 | 0*SD_SHARE_CPUPOWER \
167 | 0*SD_SHARE_PKG_RESOURCES \
168 | 0*SD_SERIALIZE \
Ingo Molnar47734f82009-09-04 11:21:24 +0200169 | sd_balance_for_package_power() \
170 | sd_power_saving_flags() \
171 , \
172 .last_balance = jiffies, \
173 .balance_interval = 1, \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174}
175#endif
176
John Hawkes9c1cfda2005-09-06 15:18:14 -0700177/* sched_domains SD_ALLNODES_INIT for NUMA machines */
Ingo Molnar47734f82009-09-04 11:21:24 +0200178#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 \
Peter Zijlstrac88d5912009-09-10 13:50:02 +0200190 | 0*SD_BALANCE_WAKE \
Peter Zijlstra6bd78212009-09-11 18:42:15 +0200191 | 0*SD_WAKE_AFFINE \
Ingo Molnar47734f82009-09-04 11:21:24 +0200192 | 0*SD_SHARE_CPUPOWER \
193 | 0*SD_POWERSAVINGS_BALANCE \
194 | 0*SD_SHARE_PKG_RESOURCES \
195 | 1*SD_SERIALIZE \
Ingo Molnar47734f82009-09-04 11:21:24 +0200196 | 0*SD_PREFER_SIBLING \
197 , \
198 .last_balance = jiffies, \
199 .balance_interval = 64, \
John Hawkes9c1cfda2005-09-06 15:18:14 -0700200}
201
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202#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
Ben Hutchingsc50cbb02008-06-04 21:47:29 -0700208#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
Rusty Russellfbd59a82009-01-10 21:58:08 -0800214#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
Ben Hutchingsc50cbb02008-06-04 21:47:29 -0700220
Rusty Russell082edb72009-03-13 23:43:37 +1030221/* 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226#endif /* _LINUX_TOPOLOGY_H */