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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
Mike Travis7c16ec52008-04-04 18:11:11 -070041#define nr_cpus_node(node) \
42 ({ \
43 node_to_cpumask_ptr(__tmp__, node); \
44 cpus_weight(*__tmp__); \
Linus Torvalds1da177e2005-04-16 15:20:36 -070045 })
46#endif
47
Mike Travis7c16ec52008-04-04 18:11:11 -070048#define for_each_node_with_cpus(node) \
49 for_each_online_node(node) \
Linus Torvalds1da177e2005-04-16 15:20:36 -070050 if (nr_cpus_node(node))
51
Heiko Carstens22e52b02008-03-12 18:31:59 +010052void arch_update_cpu_topology(void);
53
Linus Torvalds1da177e2005-04-16 15:20:36 -070054/* Conform to ACPI 2.0 SLIT distance definitions */
55#define LOCAL_DISTANCE 10
56#define REMOTE_DISTANCE 20
Ingo Molnarf787a502007-07-11 21:21:47 +020057#ifndef node_distance
Linus Torvalds1da177e2005-04-16 15:20:36 -070058#define node_distance(from,to) ((from) == (to) ? LOCAL_DISTANCE : REMOTE_DISTANCE)
59#endif
Christoph Lameter9eeff232006-01-18 17:42:31 -080060#ifndef RECLAIM_DISTANCE
61/*
62 * If the distance between nodes in a system is larger than RECLAIM_DISTANCE
63 * (in whatever arch specific measurement units returned by node_distance())
64 * then switch on zone reclaim on boot.
65 */
66#define RECLAIM_DISTANCE 20
67#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070068#ifndef PENALTY_FOR_NODE_WITH_CPUS
69#define PENALTY_FOR_NODE_WITH_CPUS (1)
70#endif
71
72/*
73 * Below are the 3 major initializers used in building sched_domains:
74 * SD_SIBLING_INIT, for SMT domains
75 * SD_CPU_INIT, for SMP domains
76 * SD_NODE_INIT, for NUMA domains
77 *
78 * Any architecture that cares to do any tuning to these values should do so
79 * by defining their own arch-specific initializer in include/asm/topology.h.
80 * A definition there will automagically override these default initializers
81 * and allow arch-specific performance tuning of sched_domains.
Mike Travis7c16ec52008-04-04 18:11:11 -070082 * (Only non-zero and non-null fields need be specified.)
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 */
Mike Travis7c16ec52008-04-04 18:11:11 -070084
Linus Torvalds1da177e2005-04-16 15:20:36 -070085#ifdef CONFIG_SCHED_SMT
86/* MCD - Do we really need this? It is always on if CONFIG_SCHED_SMT is,
87 * so can't we drop this in favor of CONFIG_SCHED_SMT?
88 */
89#define ARCH_HAS_SCHED_WAKE_IDLE
90/* Common values for SMT siblings */
91#ifndef SD_SIBLING_INIT
92#define SD_SIBLING_INIT (struct sched_domain) { \
Linus Torvalds1da177e2005-04-16 15:20:36 -070093 .min_interval = 1, \
94 .max_interval = 2, \
Siddha, Suresh Bac7d5502006-12-10 02:20:12 -080095 .busy_factor = 64, \
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 .imbalance_pct = 110, \
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 .flags = SD_LOAD_BALANCE \
98 | SD_BALANCE_NEWIDLE \
Ingo Molnar52d85342008-01-25 21:08:20 +010099 | SD_BALANCE_FORK \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 | SD_BALANCE_EXEC \
101 | SD_WAKE_AFFINE \
102 | SD_WAKE_IDLE \
103 | SD_SHARE_CPUPOWER, \
104 .last_balance = jiffies, \
105 .balance_interval = 1, \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106}
107#endif
108#endif /* CONFIG_SCHED_SMT */
109
Siddha, Suresh B89c47102006-10-03 01:14:09 -0700110#ifdef CONFIG_SCHED_MC
111/* Common values for MC siblings. for now mostly derived from SD_CPU_INIT */
112#ifndef SD_MC_INIT
113#define SD_MC_INIT (struct sched_domain) { \
Siddha, Suresh B89c47102006-10-03 01:14:09 -0700114 .min_interval = 1, \
115 .max_interval = 4, \
116 .busy_factor = 64, \
117 .imbalance_pct = 125, \
118 .cache_nice_tries = 1, \
Siddha, Suresh B89c47102006-10-03 01:14:09 -0700119 .busy_idx = 2, \
Siddha, Suresh B89c47102006-10-03 01:14:09 -0700120 .wake_idx = 1, \
121 .forkexec_idx = 1, \
122 .flags = SD_LOAD_BALANCE \
123 | SD_BALANCE_NEWIDLE \
Ingo Molnar52d85342008-01-25 21:08:20 +0100124 | SD_BALANCE_FORK \
Siddha, Suresh B89c47102006-10-03 01:14:09 -0700125 | SD_BALANCE_EXEC \
126 | SD_WAKE_AFFINE \
127 | SD_SHARE_PKG_RESOURCES\
128 | BALANCE_FOR_MC_POWER, \
129 .last_balance = jiffies, \
130 .balance_interval = 1, \
Siddha, Suresh B89c47102006-10-03 01:14:09 -0700131}
132#endif
133#endif /* CONFIG_SCHED_MC */
134
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135/* Common values for CPUs */
136#ifndef SD_CPU_INIT
137#define SD_CPU_INIT (struct sched_domain) { \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 .min_interval = 1, \
139 .max_interval = 4, \
140 .busy_factor = 64, \
141 .imbalance_pct = 125, \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 .cache_nice_tries = 1, \
Nick Piggin78979862005-06-25 14:57:13 -0700143 .busy_idx = 2, \
Ingo Molnar95dbb422007-10-15 17:00:19 +0200144 .idle_idx = 1, \
145 .newidle_idx = 2, \
Nick Piggin78979862005-06-25 14:57:13 -0700146 .wake_idx = 1, \
Nick Piggin687f1662005-06-25 14:57:21 -0700147 .forkexec_idx = 1, \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 .flags = SD_LOAD_BALANCE \
149 | SD_BALANCE_NEWIDLE \
Ingo Molnar52d85342008-01-25 21:08:20 +0100150 | SD_BALANCE_FORK \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 | SD_BALANCE_EXEC \
Siddha, Suresh B5c45bf22006-06-27 02:54:42 -0700152 | SD_WAKE_AFFINE \
Siddha, Suresh B89c47102006-10-03 01:14:09 -0700153 | BALANCE_FOR_PKG_POWER,\
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 .last_balance = jiffies, \
155 .balance_interval = 1, \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156}
157#endif
158
John Hawkes9c1cfda2005-09-06 15:18:14 -0700159/* sched_domains SD_ALLNODES_INIT for NUMA machines */
160#define SD_ALLNODES_INIT (struct sched_domain) { \
John Hawkes9c1cfda2005-09-06 15:18:14 -0700161 .min_interval = 64, \
162 .max_interval = 64*num_online_cpus(), \
163 .busy_factor = 128, \
164 .imbalance_pct = 133, \
John Hawkes9c1cfda2005-09-06 15:18:14 -0700165 .cache_nice_tries = 1, \
166 .busy_idx = 3, \
167 .idle_idx = 3, \
Christoph Lameter08c183f2006-12-10 02:20:29 -0800168 .flags = SD_LOAD_BALANCE \
169 | SD_SERIALIZE, \
John Hawkes9c1cfda2005-09-06 15:18:14 -0700170 .last_balance = jiffies, \
171 .balance_interval = 64, \
John Hawkes9c1cfda2005-09-06 15:18:14 -0700172}
173
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174#ifdef CONFIG_NUMA
175#ifndef SD_NODE_INIT
176#error Please define an appropriate SD_NODE_INIT in include/asm/topology.h!!!
177#endif
178#endif /* CONFIG_NUMA */
179
180#endif /* _LINUX_TOPOLOGY_H */