Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6
[pandora-kernel.git] / include / linux / topology.h
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 void arch_update_cpu_topology(void);
54
55 /* Conform to ACPI 2.0 SLIT distance definitions */
56 #define LOCAL_DISTANCE          10
57 #define REMOTE_DISTANCE         20
58 #ifndef node_distance
59 #define node_distance(from,to)  ((from) == (to) ? LOCAL_DISTANCE : REMOTE_DISTANCE)
60 #endif
61 #ifndef RECLAIM_DISTANCE
62 /*
63  * If the distance between nodes in a system is larger than RECLAIM_DISTANCE
64  * (in whatever arch specific measurement units returned by node_distance())
65  * then switch on zone reclaim on boot.
66  */
67 #define RECLAIM_DISTANCE 20
68 #endif
69 #ifndef PENALTY_FOR_NODE_WITH_CPUS
70 #define PENALTY_FOR_NODE_WITH_CPUS      (1)
71 #endif
72
73 /*
74  * Below are the 3 major initializers used in building sched_domains:
75  * SD_SIBLING_INIT, for SMT domains
76  * SD_CPU_INIT, for SMP domains
77  * SD_NODE_INIT, for NUMA domains
78  *
79  * Any architecture that cares to do any tuning to these values should do so
80  * by defining their own arch-specific initializer in include/asm/topology.h.
81  * A definition there will automagically override these default initializers
82  * and allow arch-specific performance tuning of sched_domains.
83  */
84 #ifdef CONFIG_SCHED_SMT
85 /* MCD - Do we really need this?  It is always on if CONFIG_SCHED_SMT is,
86  * so can't we drop this in favor of CONFIG_SCHED_SMT?
87  */
88 #define ARCH_HAS_SCHED_WAKE_IDLE
89 /* Common values for SMT siblings */
90 #ifndef SD_SIBLING_INIT
91 #define SD_SIBLING_INIT (struct sched_domain) {         \
92         .span                   = CPU_MASK_NONE,        \
93         .parent                 = NULL,                 \
94         .child                  = NULL,                 \
95         .groups                 = NULL,                 \
96         .min_interval           = 1,                    \
97         .max_interval           = 2,                    \
98         .busy_factor            = 64,                   \
99         .imbalance_pct          = 110,                  \
100         .cache_nice_tries       = 0,                    \
101         .busy_idx               = 0,                    \
102         .idle_idx               = 0,                    \
103         .newidle_idx            = 0,                    \
104         .wake_idx               = 0,                    \
105         .forkexec_idx           = 0,                    \
106         .flags                  = SD_LOAD_BALANCE       \
107                                 | SD_BALANCE_NEWIDLE    \
108                                 | SD_BALANCE_FORK       \
109                                 | SD_BALANCE_EXEC       \
110                                 | SD_WAKE_AFFINE        \
111                                 | SD_WAKE_IDLE          \
112                                 | SD_SHARE_CPUPOWER,    \
113         .last_balance           = jiffies,              \
114         .balance_interval       = 1,                    \
115         .nr_balance_failed      = 0,                    \
116 }
117 #endif
118 #endif /* CONFIG_SCHED_SMT */
119
120 #ifdef CONFIG_SCHED_MC
121 /* Common values for MC siblings. for now mostly derived from SD_CPU_INIT */
122 #ifndef SD_MC_INIT
123 #define SD_MC_INIT (struct sched_domain) {              \
124         .span                   = CPU_MASK_NONE,        \
125         .parent                 = NULL,                 \
126         .child                  = NULL,                 \
127         .groups                 = NULL,                 \
128         .min_interval           = 1,                    \
129         .max_interval           = 4,                    \
130         .busy_factor            = 64,                   \
131         .imbalance_pct          = 125,                  \
132         .cache_nice_tries       = 1,                    \
133         .busy_idx               = 2,                    \
134         .idle_idx               = 0,                    \
135         .newidle_idx            = 0,                    \
136         .wake_idx               = 1,                    \
137         .forkexec_idx           = 1,                    \
138         .flags                  = SD_LOAD_BALANCE       \
139                                 | SD_BALANCE_NEWIDLE    \
140                                 | SD_BALANCE_FORK       \
141                                 | SD_BALANCE_EXEC       \
142                                 | SD_WAKE_AFFINE        \
143                                 | SD_SHARE_PKG_RESOURCES\
144                                 | BALANCE_FOR_MC_POWER, \
145         .last_balance           = jiffies,              \
146         .balance_interval       = 1,                    \
147         .nr_balance_failed      = 0,                    \
148 }
149 #endif
150 #endif /* CONFIG_SCHED_MC */
151
152 /* Common values for CPUs */
153 #ifndef SD_CPU_INIT
154 #define SD_CPU_INIT (struct sched_domain) {             \
155         .span                   = CPU_MASK_NONE,        \
156         .parent                 = NULL,                 \
157         .child                  = NULL,                 \
158         .groups                 = NULL,                 \
159         .min_interval           = 1,                    \
160         .max_interval           = 4,                    \
161         .busy_factor            = 64,                   \
162         .imbalance_pct          = 125,                  \
163         .cache_nice_tries       = 1,                    \
164         .busy_idx               = 2,                    \
165         .idle_idx               = 1,                    \
166         .newidle_idx            = 2,                    \
167         .wake_idx               = 1,                    \
168         .forkexec_idx           = 1,                    \
169         .flags                  = SD_LOAD_BALANCE       \
170                                 | SD_BALANCE_NEWIDLE    \
171                                 | SD_BALANCE_FORK       \
172                                 | SD_BALANCE_EXEC       \
173                                 | SD_WAKE_AFFINE        \
174                                 | BALANCE_FOR_PKG_POWER,\
175         .last_balance           = jiffies,              \
176         .balance_interval       = 1,                    \
177         .nr_balance_failed      = 0,                    \
178 }
179 #endif
180
181 /* sched_domains SD_ALLNODES_INIT for NUMA machines */
182 #define SD_ALLNODES_INIT (struct sched_domain) {        \
183         .span                   = CPU_MASK_NONE,        \
184         .parent                 = NULL,                 \
185         .child                  = NULL,                 \
186         .groups                 = NULL,                 \
187         .min_interval           = 64,                   \
188         .max_interval           = 64*num_online_cpus(), \
189         .busy_factor            = 128,                  \
190         .imbalance_pct          = 133,                  \
191         .cache_nice_tries       = 1,                    \
192         .busy_idx               = 3,                    \
193         .idle_idx               = 3,                    \
194         .newidle_idx            = 0, /* unused */       \
195         .wake_idx               = 0, /* unused */       \
196         .forkexec_idx           = 0, /* unused */       \
197         .flags                  = SD_LOAD_BALANCE       \
198                                 | SD_SERIALIZE, \
199         .last_balance           = jiffies,              \
200         .balance_interval       = 64,                   \
201         .nr_balance_failed      = 0,                    \
202 }
203
204 #ifdef CONFIG_NUMA
205 #ifndef SD_NODE_INIT
206 #error Please define an appropriate SD_NODE_INIT in include/asm/topology.h!!!
207 #endif
208 #endif /* CONFIG_NUMA */
209
210 #endif /* _LINUX_TOPOLOGY_H */