tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
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) \
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
53void 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 */